To improve network reliability, set up a two-tier cascaded M-LAG structure to support Layer 3 multicast services, as shown in Figure 1. The receivers receive video-on-demand traffic through multicast. PIM protocol is enabled on each device interface, and the entire PIM domain uses SM non-administrative domain mode.

Multicast receivers can be singlehomed to the receiver side M-LAG member devices or be attached to M-LAG interfaces. The multicast source is connected to an M-LAG system through M-LAG interfaces.

Figure 1 Network diagram

Device	Interface	IP address	Peer device and interface
Device A	WGE1/0/11	IPv4: 221.1.2.1/24	Device B: WGE1/0/11
	Vlan-int20	IPv4: 20.1.1.1/24	Receiver 2
	Vlan-int21	IPv4: 21.1.1.1/24	Receiver 1
	Loopback0	IPv4: 3.3.3.3/32	N/A
	HGE1/0/28	IPv4: 11.2.1.2/24	Device C: HGE1/0/4
	HGE1/0/29	IPv4: 12.2.1.2/24	Device D: HGE1/0/4
Device B	WGE1/0/11	IPv4: 221.1.2.2/24	Device A: WGE1/0/11
	Vlan-int20	IPv4: 20.1.1.1/24	Receiver 2
	Loopback0	IPv4: 4.4.4.4/32	N/A
	HGE1/0/28	IPv4: 11.3.1.2/24	Device C: HGE1/0/5
	HGE1/0/29	IPv4: 12.3.1.2/24	Device D: HGE1/0/5
Device C	HGE1/0/6	IPv4: 220.1.1.1/24	Device D: HGE1/0/6
	Vlan-int10	IPv4: 10.1.1.1/24	Source
	Loopback0	IPv4: 1.1.1.1/32	N/A
	HGE1/0/4	IPv4: 11.2.1.1/24	Device A: HGE1/0/28
	HGE1/0/5	IPv4: 11.3.1.1/24	Device B: HGE1/0/28
Device D	HGE1/0/6	IPv4: 220.1.1.2/24	Device C: HGE1/0/6
	Vlan-int10	IPv4: 10.1.1.1/24	Source
	Loopback0	IPv4: 2.2.2.2/32	N/A
	HGE1/0/4	IPv4: 12.2.1.1/24	Device A: HGE1/0/29
	HGE1/0/5	IPv4: 12.3.1.1/24	Device B: HGE1/0/29

Applicable product matrix

IMPORTANT:

In addition to running an applicable software version, you must also install the most recent patch, if any.

Device	Software version
S6805, S6825, S6850, S9850	R6710
S9820-64H, S9820-8C	Not supported
S6800, S6860, S6900	Not supported
S12500X-AF, S12500F-AF, S6890	R2825
S12500R	Not supported
S12500G-AF	R7625
S6812, S6813	F6628P22

Analysis

· Set up one M-LAG system with Device A and Device B and another with Device C and Device D.

· Create one VLAN interface for the same VLAN on Device A and Device B, respectively. In this example, create VLAN-interface 20. Allocate the same IPv4 addresses and MAC address to the VLAN interfaces for them to act as gateway interfaces. Assign M-LAG interfaces to the VLAN of the VLAN interfaces.

· Create one VLAN interface for the same VLAN on Device C and Device D, respectively. In this example, create VLAN-interface 10. Allocate the same IPv4 addresses and MAC address to the VLAN interfaces for them to act as gateway interfaces. Assign M-LAG interfaces to the VLAN of the VLAN interfaces.

· Enable IP multicast forwarding and IGMP snooping on Device A through Device D. A device with IGMP snooping enabled forwards multicast traffic of known multicast groups to the designated receivers instead of broadcasting the multicast traffic. Configure PIM on interfaces of the devices.

· Create VLAN-interface 21 on Device A to accommodate Receiver 1, which is singlehomed to the device.

Procedure summary

· Configuring M-LAG

· Configuring the dual-active gateways

· Configuring Layer 3 multicast

Configuring M-LAG

NOTE:

For the S12500X-AF, S12500F-AF, and S6890 series switches, first configure the MAC base address, and then assign MAC addresses on each device in the M-LAG systems based on the MAC base address. For more information about MAC address configuration, see M-LAG network planning.

Configuring Device A and Device B

Device A	Device B	Description	Remarks
m-lag system-mac 1-1-2	m-lag system-mac 1-1-2	Configure the M-LAG system MAC address.	You must configure the same M-LAG system MAC address for devices in the same M-LAG system.
m-lag system-number 1	m-lag system-number 2	Set the M-LAG system number.	You must set different M-LAG system numbers for devices in the same M-LAG system.
m-lag system-priority 122	m-lag system-priority 122	Set the M-LAG system priority.	You must set the same M-LAG system priority for devices in the same M-LAG system.
m-lag standalone enable	m-lag standalone enable	Enable M-LAG standalone mode.	N/A
m-lag keepalive ip destination 221.1.2.2 source 221.1.2.1	m-lag keepalive ip destination 221.1.2.1 source 221.1.2.2	Configure the destination and source IP addresses of keepalive packets.	N/A
interface Twenty-FiveGigE1/0/11	interface Twenty-FiveGigE1/0/11	Enter the view of the interface used for setting up the keepalive link.	N/A
port link-mode route	port link-mode route	Configure the keepalive link interface to operate in route mode as a Layer 3 interface.	N/A
ip address 221.1.2.1 24	ip address 221.1.2.2 24	Assign an IP address to the keepalive link interface.	N/A
quit	quit	Return to system view.	N/A
m-lag mad exclude interface Twenty-FiveGigE1/0/11	m-lag mad exclude interface Twenty-FiveGigE1/0/11	Exclude the interface used for M-LAG keepalive detection from the shutdown action by M-LAG MAD.	N/A
interface HundredGigE1/0/28	interface HundredGigE1/0/28	Enter Ethernet interface view.	N/A
port link-mode route	port link-mode route	Configure the Ethernet interface to operate in route mode as a Layer 3 interface.	N/A
ip address 11.2.1.2/24	ip address 11.3.1.2/24	Assign an IP address to the interface.	N/A
quit	quit	Return to system view.	N/A
interface HundredGigE1/0/29	interface HundredGigE1/0/29	Enter Ethernet interface view.	N/A
port link-mode route	port link-mode route	Configure the Ethernet interface to operate in route mode as a Layer 3 interface.	N/A
ip address 12.2.1.2/24	ip address 12.3.1.2/24	Assign an IP address to the interface.	N/A
quit	quit	Return to system view.	N/A
m-lag mad exclude interface HundredGigE1/0/28	m-lag mad exclude interface HundredGigE1/0/28	Exclude an interface-facing a peer M-LAG system from the shutdown action by M-LAG MAD.	N/A
m-lag mad exclude interface HundredGigE1/0/29	m-lag mad exclude interface HundredGigE1/0/29	Exclude an interface-facing a peer M-LAG system from the shutdown action by M-LAG MAD.	N/A
interface bridge-aggregation 1000	interface bridge-aggregation 1000	Create the Layer 2 aggregate interface to be used as the peer-link interface and enter Layer 2 aggregate interface view.	N/A
quit	quit	Return to system view.	N/A
Interface HundredGigE 1/0/26	interface HundredGigE 1/0/26	Enter the view of a physical interface used for setting up the peer link.	N/A
port link-aggregation group 1000	port link-aggregation group 1000	Assign the physical interface to the aggregation group of the peer link.	N/A
quit	quit	Return to system view.	N/A
interface bridge-aggregation 1000	interface bridge-aggregation 1000	Enter the view of the aggregation group for the peer link.	N/A
undo mac-address static source-check enable	undo mac-address static source-check enable	Disable source MAC check on the interface.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the peer-link aggregate interface to operate in dynamic mode.	N/A
port m-lag peer-link 1	port m-lag peer-link 1	Specify the aggregate interface as the peer-link interface.	N/A
quit	quit	Return to system view.	N/A
interface bridge-aggregation 1	interface bridge-aggregation 1	Create an aggregate interface.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the aggregate interface to operate in dynamic mode.	N/A
port m-lag group 1	port m-lag group 1	Assign the aggregate interface to M-LAG group 1.	N/A
quit	quit	Return to system view.	N/A
interface HundredGigE1/0/30	interface HundredGigE1/0/30	Enter Ethernet interface view.	N/A
port link-aggregation group 1	port link-aggregation group 1	Assign the interface to the aggregation group of an M-LAG interface.	N/A
quit	quit	Return to system view.	N/A

Configuring Device C and Device D

Device C	Device D	Description	Remarks
m-lag system-mac 1-1-1	m-lag system-mac 1-1-1	Configure the M-LAG system MAC address.	You must configure the same M-LAG system MAC address for devices in the same M-LAG system.
m-lag system-number 1	m-lag system-number 2	Set the M-LAG system number.	You must set different M-LAG system numbers for devices in the same M-LAG system.
m-lag system-priority 121	m-lag system-priority 121	Set the M-LAG system priority.	You must set the same M-LAG system priority for devices in the same M-LAG system.
m-lag standalone enable	m-lag standalone enable	Enable M-LAG standalone mode.	N/A
m-lag keepalive ip destination 220.1.1.2 source 220.1.1.1	m-lag keepalive ip destination 220.1.1.1 source 220.1.1.2	Configure the destination and source IP addresses of keepalive packets.	N/A
interface HundredGigE1/0/6	interface HundredGigE1/0/6	Enter the view of the interface used for setting up the keepalive link.	N/A
port link-mode route	port link-mode route	Configure the keepalive link interface to operate in route mode as a Layer 3 interface.	N/A
ip address 220.1.1.1 24	ip address 220.1.1.2 24	Assign an IP address to the keepalive link interface.	N/A
quit	quit	Return to system view.	N/A
m-lag mad exclude interface HundredGigE1/0/6	m-lag mad exclude interface HundredGigE1/0/6	Exclude the interface used for M-LAG keepalive detection from the shutdown action by M-LAG MAD.	N/A
interface HundredGigE1/0/4	interface HundredGigE1/0/4	Enter Ethernet interface view.	N/A
port link-mode route	port link-mode route	Configure the Ethernet interface to operate in route mode as a Layer 3 interface.	N/A
ip address 11.2.1.1/24	ip address 11.3.1.1/24	Assign an IP address to the interface.	N/A
quit	quit	Return to system view.	N/A
interface HundredGigE1/0/5	interface HundredGigE1/0/5	Enter Ethernet interface view.	N/A
port link-mode route	port link-mode route	Configure the Ethernet interface to operate in route mode as a Layer 3 interface.	N/A
ip address 12.2.1.1/24	ip address 12.3.1.1/24	Assign an IP address to the interface.	N/A
quit	quit	Return to system view.	N/A
m-lag mad exclude interface HundredGigE1/0/4	m-lag mad exclude interface HundredGigE1/0/4	Exclude an interface-facing a peer M-LAG system from the shutdown action by M-LAG MAD.	N/A
m-lag mad exclude interface HundredGigE1/0/5	m-lag mad exclude interface HundredGigE1/0/5	Exclude an interface-facing a peer M-LAG system from the shutdown action by M-LAG MAD.	N/A
interface bridge-aggregation 1000	interface bridge-aggregation 1000	Create the Layer 2 aggregate interface to be used as the peer-link interface and enter Layer 2 aggregate interface view.	N/A
quit	quit	Return to system view.	N/A
Interface HundredGigE 1/0/8	interface HundredGigE 1/0/8	Enter the view of a physical interface used for setting up the peer link.	N/A
port link-aggregation group 1000	port link-aggregation group 1000	Assign the physical interface to the aggregation group of the peer link.	N/A
quit	quit	Return to system view.	N/A
interface bridge-aggregation 1000	interface bridge-aggregation 1000	Enter the view of the aggregation group for the peer link.	N/A
undo mac-address static source-check enable	undo mac-address static source-check enable	Disable source MAC check on the interface.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the peer-link aggregate interface to operate in dynamic mode.	N/A
port m-lag peer-link 1	port m-lag peer-link 1	Configure the aggregate interface as the peer-link interface.	N/A
quit	quit	Return to system view.	N/A
interface bridge-aggregation 1	interface bridge-aggregation 1	Create an aggregate interface.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the aggregate interface to operate in dynamic mode.	N/A
port m-lag group 1	port m-lag group 1	Assign the aggregate interface to M-LAG group 1.	N/A
quit	quit	Return to system view.	N/A
interface HundredGigE 1/0/7	interface HundredGigE 1/0/7	Enter Ethernet interface view.	N/A
port link-aggregation group 1	port link-aggregation group 1	Assign the interface to the aggregation group of an M-LAG interface.	N/A
quit	quit	Return to system view.	N/A

Configuring the dual-active gateways

NOTE:

Configuring Device A and Device B

Device A	Device B	Description
vlan 20	vlan 20	Create VLAN 20.
interface bridge-aggregation 1	interface bridge-aggregation 1	Enter aggregate interface view.
port link-type trunk	port link-type trunk	Set the link type of the Layer 2 aggregate interface to trunk.
port trunk permit vlan 20	port trunk permit vlan 20	Assign the interface to VLAN 20.
undo port trunk permit vlan 1	undo port trunk permit vlan 1	Remove the interface from VLAN 1.
quit	quit	Return to system view.
interface vlan-interface 20	interface vlan-interface 20	Create VLAN-interface 20.
ip address 20.1.1.1 255.255.255.0	ip address 20.1.1.1 255.255.255.0	Assign an IPv4 address to VLAN-interface 20.
mac-address 0020-0020-0020	mac-address 0020-0020-0020	Assign a MAC address to VLAN-interface 20.
quit	quit	Return to system view.
m-lag mad exclude interface Vlan-interface20	m-lag mad exclude interface Vlan-interface20	Exclude VLAN-interface 20 from the shutdown action by M-LAG MAD.
vlan 21	-	Create VLAN 21.
interface Twenty-FiveGigE1/0/1	-	Enter Ethernet interface view.
port link-type trunk	-	Set the link type of the interface to trunk.
port trunk permit vlan 21	-	Assign the interface to VLAN 21.
undo port trunk permit vlan 1	-	Remove the interface from VLAN 1.
quit	-	Return to system view.
interface vlan-interface 21	-	Create VLAN-interface 21.
ip address 21.1.1.1 255.255.255.0	-	Assign an IPv4 address to VLAN-interface 21.
mac-address 0020-0020-0021	-	Assign a MAC address to VLAN-interface 21.
quit	-	Return to system view.
m-lag mad exclude interface Vlan-interface21	-	Exclude VLAN-interface 21 from the shutdown action by M-LAG MAD.

Configuring Device C and Device D

Device C	Device D	Description
vlan 10	vlan 10	Create VLAN 10.
interface bridge-aggregation 1	interface bridge-aggregation 1	Enter aggregate interface view.
port link-type trunk	port link-type trunk	Set the link type of the Layer 2 aggregate interface to trunk.
port trunk permit vlan 10	port trunk permit vlan 10	Assign the interface to VLAN 10.
undo port trunk permit vlan 1	undo port trunk permit vlan 1	Remove the interface from VLAN 1.
quit	quit	Return to system view.
interface vlan-interface 10	interface vlan-interface 10	Create VLAN-interface 10.
ip address 10.1.1.1 255.255.255.0	ip address 10.1.1.1 255.255.255.0	Assign an IPv4 address to VLAN-interface 10.
mac-address 0010-0010-0010	mac-address 0010-0010-0010	Assign a MAC address to VLAN-interface 10.
quit	quit	Return to system view.
m-lag mad exclude interface Vlan-interface10	m-lag mad exclude interface Vlan-interface10	Exclude VLAN-interface 10 from the shutdown action by M-LAG MAD.

Configuring Layer 3 multicast

Configuring Device A and Device B

Device A	Device B	Description
multicast routing	multicast routing	Enable IP multicast routing.
igmp-snooping	igmp-snooping	Enable IGMP snooping.
Vlan 20	Vlan 20	Enter VLAN view.
igmp-snooping enable	igmp-snooping enable	Enable IGMP snooping in the VLAN.
interface Vlan-interface20	interface Vlan-interface20	Enable VLAN interface view.
pim sm	pim sm	Enable PIM SM.
igmp enable	igmp enable	Enable IGMP.
pim distributed-dr	pim distributed-dr	Configure the interface as a DR interface to forward multicast traffic. This command is not supported by the S12500X-AF, S12500F-AF, or S6890 switches.
pim passive	pim passive	Enable PIM passive mode for the interface to forward multicast traffic. Execute this command only on the S12500X-AF, S12500F-AF, or S6890 switch.
quit	quit	Return to the upper-level view.
interface Vlan-interface21	-	Enable VLAN interface view.
pim sm	-	Enable PIM SM.
igmp enable	-	Enable IGMP.
quit	-	Return to the upper-level view.
interface HundredGigE1/0/28	interface HundredGigE1/0/28	Enter Ethernet interface view.
pim sm	pim sm	Enable PIM SM.
quit	quit	Return to the upper-level view.
interface HundredGigE1/0/29	interface HundredGigE1/0/29	Enter Ethernet interface view.
pim sm	pim sm	Enable PIM SM.
quit	quit	Return to the upper-level view.
interface LoopBack0	interface LoopBack0	Enter loopback interface view.
pim sm	pim sm	Enable PIM SM.
quit	quit	Return to the upper-level view.
interface Twenty-FiveGigE1/0/11	interface Twenty-FiveGigE1/0/11	Enter Ethernet interface view.
pim sm	pim sm	Enable PIM SM.
quit	quit	Return to the upper-level view.
pim	pim	Enter PIM view.
static-rp 4.4.4.4	static-rp 4.4.4.4	Configure a static RP.

Configuring Device C and Device D

Device C	Device D	Description
multicast routing	multicast routing	Enable IP multicast routing.
igmp-snooping	igmp-snooping	Enable IGMP snooping.
Vlan 10	Vlan 10	Enter VLAN view.
igmp-snooping enable	igmp-snooping enable	Enable IGMP snooping in the VLAN.
quit	quit	Return to the upper-level view.
interface Vlan-interface10	interface Vlan-interface10	Enable VLAN interface view.
pim sm	pim sm	Enable PIM SM.
pim distributed-dr	pim distributed-dr	Configure the interface as a DR interface to forward multicast traffic. This command is not supported by the S12500X-AF, S12500F-AF, or S6890 switches.
pim passive	pim passive	Enable PIM passive mode for the interface to forward multicast traffic. Execute this command only on the S12500X-AF, S12500F-AF, or S6890 switch.
quit	quit	Return to the upper-level view.
interface HundredGigE1/0/4	interface HundredGigE1/0/4	Enter Ethernet interface view.
pim sm	pim sm	Enable PIM SM.
quit	quit	Return to the upper-level view.
interface HundredGigE1/0/5	interface HundredGigE1/0/5	Enter Ethernet interface view.
pim sm	pim sm	Enable PIM SM.
quit	quit	Return to the upper-level view.
interface LoopBack0	interface LoopBack0	Enter loopback interface view.
pim sm	pim sm	Enable PIM SM.
quit	quit	Return to the upper-level view.
interface HundredGigE1/0/6	interface HundredGigE1/0/6	Enter Ethernet interface view.
pim sm	pim sm	Enable PIM SM.
quit	quit	Return to the upper-level view.
pim	pim	Enter PIM view.
static-rp 4.4.4.4	static-rp 4.4.4.4	Configure a static RP.

Traffic forwarding models

Underlay traffic characteristics

The forwarding model matrix provides the following characteristics of underlay traffic:

· No.—Traffic number in the U-X-XXX format:

¡ U—Underlay traffic.

¡ X—Protocol number, which can be 4 (IPv4)

¡ XXX—Traffic sequence number.

· Traffic type—Type of underlay traffic, which can only be IPv4 known multicast

· Direction—Direction of underlay traffic. The value is south-north, which indicates traffic from the south to north.

· Forwarding path—Nodes that underlay traffic traverses.

· Traffic simulation—Traffic simulation method. Typically, a tester is used to simulate server traffic.

· Load—Traffic size, which can be light (less than 1000 flows) and heavy (more than 1000 flows).

· Traffic direction to firewalls/LB—No firewalls or LBs are used in this example. This field is not involved.

Forwarding models

No.

Traffic type

Direction

Forwarding path

Traffic simulation

Load

Traffic direction to firewalls/LB

U-4-101

IPv4 known multicast

South-north

100 multicast groups

Source > Device C and Device D > Device A and Device B > Receiver 2

Tester

Light

N/A

U-4-102

IPv4 known mutlicsat

South-north

100 multicast groups

Source > Device C and Device D > Device A and Device B > Receiver 1

Tester

Light

N/A

Testing network convergence upon single points of failure

Table 1 Network convergence upon single points of failure

Device	Failure type	Traffic interruption time (U-4-101/U-4-102)
M-LAG	Multicast source-side single point of failure on M-LAG member links	≤ 100 ms
	Multicast source-side single point of failure restored on M-LAG member links	≤ 100 ms
	Multicast source-side peer link failure	≤ 500 ms
	Multicast source-side peer link failure restored	≤ 100 ms
	Multicast source-side keepalive link failure	0 ms
	Multicast source-side keepalive link failure restored	0 ms
	Multicast source-side keepalive link and peer link failure	≤ 500 ms
	Multicast source-side keepalive link and peer link failure restored	≤ 500 ms
	Single ECMP link failure between the M-LAG systems	≤ 500 ms/1000 ms
	Single ECMP link restored between the M-LAG systems	≤ 100 ms
	Multicast-receiver side single point of failure on M-LAG member links	≤ 100 ms/0 ms
	Multicast-receiver side single point of failure restored on M-LAG member links	≤ 100 ms/0 ms
	Multicast-receiver side peer link failure	≤ 100 ms/0 ms
	Multicast-receiver side peer link failure restored	≤ 100 ms/0 ms
	Multicast-receiver side keepalive link failure	0 ms
	Multicast-receiver side keepalive link failure restored	0 ms
	Multicast-receiver side keepalive link and peer link failure	≤ 500 ms/0 ms
	Multicast-receiver side keepalive link and peer link restored	≤ 500 ms/0 ms
	Upgrade	≤ 10000 ms (upgrade the M-LAG member devices one after another)
	Hardware replacement	Fixed-port device replacement: ≤ 10000 ms

Verifying the configuration

Verifying the status of the M-LAG system

Verify that the M-LAG system is working correctly on Device A and Device B. Use Device A as an example. The verification procedure is the same for Device B, Device C, and Device D.

# Display summary information about the peer-link interface and M-LAG interface.

[Device A]display m-lag summary

Flags: A -- Aggregate interface down, B -- No peer M-LAG interface configured

C -- Configuration consistency check failed

Peer-link interface: BAGG1000

Peer-link interface state (cause): UP

Keepalive link state (cause): UP

M-LAG interface information

M-LAG IF M-LAG group Local state (cause) Peer state Remaining down time(s)

BAGG1 1 UP UP -

# Verify that keepalive link is working correctly.

[Device A]display m-lag keepalive

Neighbor keepalive link status (cause): Up

Neighbor is alive for: 256 s 620 ms

Keepalive packet transmission status:

Sent: Successful

Received: Successful

Last received keepalive packet information:

Source IP address: 221.1.2.2

Time: 2023/06/13 05:00:51

Action: Accept

M-LAG keepalive parameters:

Destination IP address: 221.1.2.2

Source IP address: 221.1.2.1

Keepalive UDP port : 6400

Keepalive VPN name : N/A

Keepalive interval : 1000 ms

Keepalive timeout : 5 sec

Keepalive hold time: 3 sec

# Display the M-LAG system information.

[Device A]display m-lag system

System information

Local system number: 1 Peer system number: 2

Local system MAC: 0001-0001-0002 Peer system MAC: 0001-0001-0002

Local system priority: 122 Peer system priority: 122

Local bridge MAC: dcda-8037-2bc0 Peer bridge MAC: bc22-4720-d5b9

Local effective role: Secondary Peer effective role: Primary

Health level: 0

Standalone mode on split: Enabled

In standalone mode: No

System timer information

Timer State Value (s) Remaining time (s)

Auto recovery Disabled - -

Restore delay Disabled 60 -

Consistency-check delay Disabled 30 -

Standalone delay Disabled 0 -

Role to None delay Disabled 60 -

# Display detailed information about the peer-link interface and M-LAG interfaces.

[Device A]display m-lag verbose

Flags: A -- Home_Gateway, B -- Neighbor_Gateway, C -- Other_Gateway,

D -- PeerLink_Activity, E -- DRCP_Timeout, F -- Gateway_Sync,

G -- Port_Sync, H -- Expired

Peer-link interface/Peer-link interface ID: BAGG1000/1

State: UP

Cause: -

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

Local Selected ports (index): HGE1/0/26 (30)

Peer Selected ports indexes: 225

M-LAG interface/M-LAG group ID: BAGG1/1

Local M-LAG interface state: UP

Peer M-LAG interface state: UP

M-LAG group state: UP

Local M-LAG interface down cause: -

Remaining M-LAG DOWN time: -

Local M-LAG interface LACP MAC: Config=N/A, Effective=0001-0001-0002

Peer M-LAG interface LACP MAC: Config=N/A, Effective=0001-0001-0002

Local M-LAG interface LACP priority: Config=32768, Effective=122

Peer M-LAG interface LACP priority: Config=32768, Effective=122

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

Local Selected ports (index): HGE1/0/30 (50)

Peer Selected ports indexes: 245

Verifying multicast forwarding information

# Verify that PIM neighbor relationships are established correctly.

[Device A]display pim neighbor

Total Number of Neighbors = 3

Neighbor Interface Uptime Expires DR-Priority Mode

221.1.2.2 WGE1/0/11 00:06:12 00:01:37 1 P

11.2.1.1 HGE1/0/28 2d:00h 00:01:44 1 P

12.2.1.1 HGE1/0/29 00:15:52 00:01:44 1 P

[Device B]display pim neighbor

Total Number of Neighbors = 3

Neighbor Interface Uptime Expires DR-Priority Mode

221.1.2.1 WGE1/0/11 00:06:40 00:01:35 1 P

11.3.1.1 HGE1/0/28 2d:00h 00:01:44 1 P

12.3.1.1 HGE1/0/29 2d:00h 00:01:32 1 P

[Device C]display pim neighbor

Total Number of Neighbors = 3

Neighbor Interface Uptime Expires DR-Priority Mode

11.2.1.2 HGE1/0/4 2d:00h 00:01:42 1 P

11.3.1.2 HGE1/0/5 2d:00h 00:01:27 1 P

220.1.1.2 HGE1/0/6 00:19:34 00:01:37 1 P

[Device D]display pim neighbor

Total Number of Neighbors = 3

Neighbor Interface Uptime Expires DR-Priority Mode

12.2.1.2 HGE1/0/4 00:16:32 00:01:26 1 P

12.3.1.2 HGE1/0/5 2d:00h 00:01:20 1 P

220.1.1.1 HGE1/0/6 00:19:38 00:01:26 1 P

# Verify that multicast forwarding entries are created correctly.

[Device A]dis igmp group

IGMP groups in total: 200

Vlan-interface20(20.1.1.1):

IGMP groups reported in total: 100

Group address Last reporter Uptime Expires

225.0.0.1 20.1.1.2 00:07:34 00:03:04

225.0.0.2 20.1.1.2 00:07:26 00:03:03

225.0.0.3 20.1.1.2 00:07:30 00:03:07

225.0.0.98 20.1.1.2 00:07:28 00:03:07

225.0.0.99 20.1.1.2 00:07:27 00:03:10

225.0.0.100 20.1.1.2 00:07:26 00:03:06

Vlan-interface21(21.1.1.1):

IGMP groups reported in total: 100

Group address Last reporter Uptime Expires

226.0.0.1 21.1.1.2 00:32:50 00:04:17

226.0.0.2 21.1.1.2 00:32:50 00:02:12

226.0.0.3 21.1.1.2 00:32:50 00:02:12

226.0.0.98 21.1.1.2 00:32:50 00:04:15

226.0.0.99 21.1.1.2 00:32:50 00:04:18

226.0.0.100 21.1.1.2 00:32:50 00:02:11

# Verify that PIM routing entries are created correctly.

[Device A]dis pim routing-table

Total 200 (*, G) entries; 200 (S, G) entries

(*, 225.0.0.1)

RP: 4.4.4.4

Protocol: pim-sm, Flag: WC

UpTime: 00:08:57

Upstream interface: HundredGigE1/0/29

Upstream neighbor: 12.2.1.1

RPF prime neighbor: 12.2.1.1

Downstream interface information:

Total number of downstream interfaces: 1

1: Vlan-interface20

Protocol: igmp, UpTime: 00:08:57, Expires: -

(10.1.1.2, 225.0.0.1)

RP: 4.4.4.4

Protocol: pim-sm, Flag: SPT ACT 2MVPN

UpTime: 00:41:07

Upstream interface: HundredGigE1/0/29

Upstream neighbor: 12.2.1.1

RPF prime neighbor: 12.2.1.1

Downstream interface information:

Total number of downstream interfaces: 1

1: Vlan-interface20

Protocol: pim-sm, UpTime: 00:08:57, Expires: -

(*, 226.0.0.1)

RP: 4.4.4.4

Protocol: pim-sm, Flag: WC

UpTime: 00:34:27

Upstream interface: HundredGigE1/0/29

Upstream neighbor: 12.2.1.1

RPF prime neighbor: 12.2.1.1

Downstream interface information:

Total number of downstream interfaces: 1

1: Vlan-interface21

Protocol: igmp, UpTime: 00:34:27, Expires: -

(10.1.1.2, 226.0.0.1)

RP: 4.4.4.4

Protocol: pim-sm, Flag: SPT ACT 2MVPN

UpTime: 00:37:01

Upstream interface: HundredGigE1/0/29

Upstream neighbor: 12.2.1.1

RPF prime neighbor: 12.2.1.1

Downstream interface information:

Total number of downstream interfaces: 1

1: Vlan-interface21

Protocol: pim-sm, UpTime: 00:34:27, Expires: -

[Device B]display pim routing-table

Total 200 (*, G) entries; 201 (S, G) entries

(*, 225.0.0.1)

RP: 4.4.4.4 (local)

Protocol: pim-sm, Flag: WC

UpTime: 00:15:09

Upstream interface: Register-Tunnel0

Upstream neighbor: NULL

RPF prime neighbor: NULL

Downstream interface information:

Total number of downstream interfaces: 2

1: HundredGigE1/0/29

Protocol: pim-sm, UpTime: 00:10:02, Expires: 00:03:28

2: Vlan-interface20

Protocol: igmp, UpTime: 00:15:09, Expires: -

(10.1.1.2, 225.0.0.1)

RP: 4.4.4.4 (local)

Protocol: pim-sm, Flag: SPT 2MSDP ACT 2MVPN

UpTime: 00:44:11

Upstream interface: HundredGigE1/0/29

Upstream neighbor: 12.3.1.1

RPF prime neighbor: 12.3.1.1

Downstream interface information:

Total number of downstream interfaces: 1

1: Vlan-interface20

Protocol: pim-sm, UpTime: 00:15:09, Expires: -

(*, 226.0.0.1)

RP: 4.4.4.4 (local)

Protocol: pim-sm, Flag: WC

UpTime: 00:23:10

Upstream interface: Register-Tunnel0

Upstream neighbor: NULL

RPF prime neighbor: NULL

Downstream interface information:

Total number of downstream interfaces: 1

1: HundredGigE1/0/29

Protocol: pim-sm, UpTime: 00:20:31, Expires: 00:02:58

(10.1.1.2, 226.0.0.1)

RP: 4.4.4.4 (local)

Protocol: pim-sm, Flag: RPT 2MSDP ACT 2MVPN

UpTime: 00:45:34

Upstream interface: Register-Tunnel0

Upstream neighbor: NULL

RPF prime neighbor: NULL

Downstream interface information: None

Upgrading the devices

Checking the environment

Execute the commands in "Verifying the configuration" and the following commands to verify that the devices are available for an upgrade.

M-LAG 1	M-LAG 2	Description
display device	display device	Displays device information.
display boot-loader	display boot-loader	Displays current software images and startup software images.
display version	display version	Displays system version information.

Upgrading the devices

See H3C Switches M-LAG System Upgrade & Replacement & Expansion Guide.

Verifying the traffic interruption time during the upgrade

See "Testing network convergence upon single points of failure."

Verifying the upgrade result

Execute the commands in "Verifying the configuration" and the following commands to verify that the device is upgraded successfully.

M-LAG 1	M-LAG 2	Description
display device	display device	Displays device information.
display boot-loader	display boot-loader	Displays current software images and startup software images.
display version	display version	Displays system version information.

Replacing hardware

Replacing a service module

Checking the environment

Execute the commands in "Verifying the configuration" and the following commands to verify that the device is available for a replacement.

M-LAG 1	M-LAG 2	Description
display device	display device	Displays device information.
display boot-loader	display boot-loader	Displays current software images and startup software images.
display version	display version	Displays system version information.

Replacing hardware

Switch service and management traffic on the target service module to other service modules.

Power off the device and replace the service module, or replace the service module when the device is running. For more information, see the installation guides for the service module.

For details, see H3C Switches M-LAG System Upgrade & Replacement & Expansion Guide.

Verifying the traffic interruption time

For more information, see "Testing network convergence upon single points of failure."

Verifying the replacement result

Execute the commands in "Checking the environment."

Replacing a switching fabric module

Checking the environment

Execute the commands in "Verifying the configuration" and the following commands to verify that the device is available for a replacement.

M-LAG 1	M-LAG 2	Description
display device	display device	Displays device information.
display boot-loader	display boot-loader	Displays current software images and startup software images.
display version	display version	Displays system version information.

Replacing hardware

Power off the device and replace the switching fabric module, or replace the switching fabric module when the device is running. For more information, see the installation guides for the switching fabric module.

Verifying the traffic interruption time

For more information, see "Testing network convergence upon single points of failure."

Verifying the replacement result

Execute the commands in "Checking the environment."

Replace a device

Checking the environment

Execute the commands in "Verifying the configuration" and the following commands to verify that the device is available for a replacement.

M-LAG 1	M-LAG 2	Description
display device	display device	Displays device information.
display boot-loader	display boot-loader	Displays current software images and startup software images.
display version	display version	Displays system version information.

Replacing hardware

See H3C Switches M-LAG System Upgrade & Replacement & Expansion Guide.

Verifying the traffic interruption time

For more information, see "Testing network convergence upon single points of failure."

Verifying the replacement result

Execute the commands in "Checking the environment."

Example: Setting up two cascaded M-LAG systems with multicast source and receivers attached via intermediate devices

Network configuration

To improve network reliability, set up a two-tier cascaded M-LAG structure to support Layer 3 multicast services, as shown in Figure 2. The receivers receive video-on-demand traffic through multicast. PIM protocol is enabled on each device interface, and the entire PIM domain uses SM non-administrative domain mode.

Configure M-LAG dual-active gateways, and run the OSPF protocol in the network to establish dynamic routing neighbors between the two-tier cascaded M-LAG systems and between the M-LAG systems and user-side devices. OSPF reduces the difficulty of network operation and enhances flexible deployment capabilities.

Enable M-LAG standalone mode and set the priority of aggregate interfaces for the following purposes:

· When an access link fails, traffic can be quickly switched to another link to ensure reliability.

· The two access links can forward user traffic simultaneously to increase bandwidth, and traffic load can be shared between the two access links.

· If multiple link failures cause an M-LAG system to split, M-LAG switches to standalone mode. Only the designated device forwards business traffic to avoid abnormal traffic forwarding.

Figure 2 Network diagram

Device	Interface	IP address	Peer device and interface
Device A	HGE1/0/25	IPv4: 221.1.3.1/24	Device B: HGE1/0/25
	Vlan-int10	IPv4: 10.1.1.1/24	Device F: Vlan-int10
	Vlan-int20	IPv4: 20.1.1.1/24	Device C and Device D: Vlan-int20
	Loopback0	IPv4: 5.5.5.5/32	N/A
Device B	HGE1/0/25	IPv4: 221.1.3.2/24	Device A: HGE1/0/25
	Vlan-int10	IPv4: 10.1.1.1/24	Device F: Vlan-int10
	Vlan-int20	IPv4: 20.1.1.1/24	Device C and Device D: Vlan-int20
	Loopback0	IPv4: 6.6.6.6/32	N/A
Device C	HGE1/0/25	IPv4: 221.1.2.1/24	Device D: HGE1/0/25
	Vlan-int20	IPv4: 20.1.1.2/24	Device A and Device B: Vlan-int20
	Vlan-int30	IPv4: 30.1.1.1/24	Device E: Vlan-int30
	Loopback0	IPv4: 3.3.3.3/32	N/A
Device D	HGE1/0/25	IPv4: 221.1.2.2/24	Device C: HGE1/0/25
	Vlan-int20	IPv4: 20.1.1.2/24	Device A and Device B: Vlan-int20
	Vlan-int30	IPv4: 30.1.1.1/24	Device E: Vlan-int30
	Loopback0	IPv4: 4.4.4.4/32	N/A
Device E	Vlan-int30	IPv4: 30.1.1.3/24	Device C and Device D: Vlan-int30
	Vlan-int40	IPv4: 40.1.0.1/16	N/A
	Loopback0	IPv4: 1.1.1.1/32	N/A
Device F	Vlan-int10	IPv4: 10.1.1.2/24	Device A and Device B: Vlan-int10
	Vlan-int50	IPv4: 50.1.1.1/24	N/A
	Loopback0	IPv4: 2.2.2.2/32	N/A

Applicable product matrix

IMPORTANT:

In addition to running an applicable software version, you must also install the most recent patch, if any.

Device	Software version
S6805/S6825/S6850/S9850	R6710
S9820-64H/S9820-8C	Not supported
S6800/S6860/S6900	Not supported
S12500X-AF/S12500F-AF/S6890	R2825
S12500R	Not supported
S12500G-AF	R7625
S6812/S6813	F6628P22

Analysis

· Set up one M-LAG system with Device A and Device B and another with Device C and Device D.

· Create one VLAN interface for the same VLAN on Device A and Device B, respectively. In this example, create VLAN-interface 10. Allocate the same IPv4 addresses and MAC address to the VLAN interfaces for them to act as gateway interfaces. Assign M-LAG interfaces to the VLAN of the VLAN interfaces.

· Create one VLAN interface for the same VLAN on Device C and Device D, respectively. In this example, create VLAN-interface 20. Allocate the same IPv4 addresses and MAC address to the VLAN interfaces for them to act as gateway interfaces. Assign M-LAG interfaces to the VLAN of the VLAN interfaces.

· Assign M-LAG virtual IP addresses to the VLAN interfaces for the M-LAG member devices to set up OSPF neighbor relationships among them and with Device E and Device F.

· Enable IP multicast forwarding and IGMP snooping on Device A through Device F. A device with IGMP snooping enabled forwards multicast traffic of known multicast groups to the designated receivers instead of broadcasting the multicast traffic. Configure PIM on interfaces of the devices.

Procedure summary

· Configuring M-LAG

· Configuring the dual-active gateways

· Configuring OSPF for establishing Layer 3 connectivity between M-LAG member devices

· Configuring Layer 3 multicast

Configuring M-LAG

NOTE:

Configuring Device A and Device B

Device A	Device B	Description	Remarks
m-lag system-mac 5-5-5	m-lag system-mac 5-5-5	Configure the M-LAG system MAC address.	You must configure the same M-LAG system MAC address for devices in the same M-LAG system.
m-lag system-number 1	m-lag system-number 2	Set the M-LAG system number.	You must set different M-LAG system numbers for devices in the same M-LAG system.
m-lag system-priority 123	m-lag system-priority 123	Set the M-LAG system priority.	You must set the same M-LAG system priority for devices in the same M-LAG system.
m-lag standalone enable	m-lag standalone enable	Enable M-LAG standalone mode.	N/A
m-lag keepalive ip destination 221.1.3.2 source 221.1.3.1	m-lag keepalive ip destination 221.1.3.1 source 221.1.3.2	Configure the destination and source IP addresses of keepalive packets.	N/A
interface HundredGigE 1/0/25	interface HundredGigE 1/0/25	Enter the view of the interface used for setting up the keepalive link.	N/A
port link-mode route	port link-mode route	Configure the keepalive link interface to operate in route mode as a Layer 3 interface.	N/A
ip address 221.1.3.1 24	ip address 221.1.3.2 24	Assign an IP address to the keepalive link interface.	N/A
quit	quit	Return to system view.	N/A
m-lag mad exclude interface HundredGigE 1/0/25	m-lag mad exclude interface HundredGigE 1/0/25	Exclude the interface used for M-LAG keepalive detection from the shutdown action by M-LAG MAD.	N/A
interface bridge-aggregation 3	interface bridge-aggregation 3	Create the Layer 2 aggregate interface to be used as the peer-link interface and enter Layer 2 aggregate interface view.	N/A
quit	quit	Return to system view.	N/A
Interface HundredGigE 1/0/26	interface HundredGigE 1/0/26	Enter the view of a physical interface used for setting up the peer link.	N/A
port link-aggregation group 3	port link-aggregation group 3	Assign the physical interface to the aggregation group of the peer link.	N/A
quit	quit	Return to system view.	N/A
interface bridge-aggregation 3	interface bridge-aggregation 3	Enter the view of the aggregation group for the peer link.	N/A
undo mac-address static source-check enable	undo mac-address static source-check enable	Disable source MAC check on the interface.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the peer-link aggregate interface to operate in dynamic mode.	N/A
port m-lag peer-link 1	port m-lag peer-link 1	Specify the aggregate interface as the peer-link interface.	N/A
quit	quit	Return to system view.	N/A
interface bridge-aggregation 1	interface bridge-aggregation 1	Create an aggregate interface.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the aggregate interface to operate in dynamic mode.	N/A
port m-lag group 1	port m-lag group 1	Assign the aggregate interface to M-LAG group 1.	N/A
quit	quit	Return to system view.	N/A
interface bridge-aggregation 2	interface bridge-aggregation 2	Create an aggregate interface.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the aggregate interface to operate in dynamic mode.	N/A
port m-lag group 2	port m-lag group 2	Assign the aggregate interface to M-LAG group 2.	N/A
quit	quit	Return to system view.	N/A
interface range HundredGigE 1/0/27 HundredGigE 1/0/29	interface range HundredGigE 1/0/27 HundredGigE 1/0/29	Enter Ethernet interface view.	N/A
port link-aggregation group 1	port link-aggregation group 1	Assign the interface to the aggregation group of an M-LAG interface.	N/A
quit	quit	Return to system view.	N/A
interface HundredGigE 1/0/30	interface HundredGigE 1/0/30	Enter Ethernet interface view.	N/A
port link-aggregation group 2	port link-aggregation group 2	Assign the interface to the aggregation group of an M-LAG interface.	N/A
quit	quit	Return to system view.	N/A

Configuring Device C and Device D

Device C	Device D	Description	Remarks
m-lag system-mac 3-3-3	m-lag system-mac 3-3-3-	Configure the M-LAG system MAC address.	You must configure the same M-LAG system MAC address for devices in the same M-LAG system.
m-lag system-number 1	m-lag system-number 2	Set the M-LAG system number.	You must set different M-LAG system numbers for devices in the same M-LAG system.
m-lag system-priority 122	m-lag system-priority 122	Set the M-LAG system priority.	You must set the same M-LAG system priority for devices in the same M-LAG system.
m-lag standalone enable	m-lag standalone enable	Enable M-LAG standalone mode.	N/A
m-lag keepalive ip destination 221.1.2.2 source 221.1.2.1	m-lag keepalive ip destination 221.1.2.1 source 221.1.1.2	Configure the destination and source IP addresses of keepalive packets.	N/A
interface HundredGigE 1/0/25	interface HundredGigE 1/0/25	Enter the view of the interface used for setting up the keepalive link.	N/A
port link-mode route	port link-mode route	Configure the keepalive link interface to operate in route mode as a Layer 3 interface.	N/A
ip address 221.1.2.1 24	ip address 221.1.2.2 24	Assign an IP address to the keepalive link interface.	N/A
quit	quit	Return to system view.	N/A
m-lag mad exclude interface HundredGigE 1/0/25	m-lag mad exclude interface HundredGigE 1/0/25	Exclude the interface used for M-LAG keepalive detection from the shutdown action by M-LAG MAD.	N/A
interface bridge-aggregation 3	interface bridge-aggregation 3	Create the Layer 2 aggregate interface to be used as the peer-link interface and enter Layer 2 aggregate interface view.	N/A
quit	quit	Return to system view.	N/A
Interface HundredGigE 1/0/26	interface HundredGigE 1/0/26	Enter the view of a physical interface used for setting up the peer link.	N/A
port link-aggregation group 3	port link-aggregation group 3	Assign the physical interface to the aggregation group of the peer link.	N/A
quit	quit	Return to system view.	N/A
interface bridge-aggregation 3	interface bridge-aggregation 3	Enter the view of the aggregation group for the peer link.	N/A
undo mac-address static source-check enable	undo mac-address static source-check enable	Disable source MAC check on the interface.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the peer-link aggregate interface to operate in dynamic mode.	N/A
port m-lag peer-link 1	port m-lag peer-link 1	Specify the aggregate interface as the peer-link interface.	N/A
quit	quit	Return to system view.	N/A
interface bridge-aggregation 1	interface bridge-aggregation 1	Create an aggregate interface.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the aggregate interface to operate in dynamic mode.	N/A
port m-lag group 1	port m-lag group 1	Assign the aggregate interface to M-LAG group 1.	N/A
quit	quit	Return to system view.	N/A
interface bridge-aggregation 2	interface bridge-aggregation 2	Create an aggregate interface.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the aggregate interface to operate in dynamic mode.	N/A
port m-lag group 2	port m-lag group 2	Assign the aggregate interface to M-LAG group 2.	N/A
quit	quit	Return to system view.	N/A
interface range HundredGigE 1/0/27 HundredGigE 1/0/29	interface range HundredGigE 1/0/27 HundredGigE 1/0/29	Enter Ethernet interface view.	N/A
port link-aggregation group 1	port link-aggregation group 1	Assign the interface to the aggregation group of an M-LAG interface.	N/A
quit	quit	Return to system view.	N/A
interface HundredGigE 1/0/30	interface undredGigE 1/0/30	Enter the view of the interface connecting to Device A and Device B.	N/A
port link-aggregation group 2	port link-aggregation group 2	Assign the interface to the aggregation group of an M-LAG interface.	N/A
quit	quit	Return to system view.	N/A

Configuring the dual-active gateways

NOTE:

Configuring Device A and Device B

Device A	Device B	Description	Remarks
vlan 10 20	vlan 10 20	Create VLAN 10 and VLAN 20.	N/A
interface bridge-aggregation 1	interface bridge-aggregation 1	Enter aggregate interface view.	N/A
port link-type trunk	port link-type trunk	Set the link type of the Layer 2 aggregate interface to trunk.	N/A
port trunk permit vlan 20	port trunk permit vlan 20	Assign the interface to VLAN 20.	N/A
undo port trunk permit vlan 1	undo port trunk permit vlan 1	Remove the interface from VLAN 1.	N/A
port lacp system-priority 101	port lacp system-priority 100	Set the LACP priority.	Set different LACP priorities for different M-LAG member devices, so that only member ports with a higher priority are selected upon brain split.
quit	quit	Return to system view.	N/A
interface bridge-aggregation 2	interface bridge-aggregation 2	Enter aggregate interface view.	N/A
port link-type trunk	port link-type trunk	Set the link type of the Layer 2 aggregate interface to trunk.	N/A
port trunk permit vlan 10	port trunk permit vlan 10	Assign the interface to VLAN 10.	N/A
undo port trunk permit vlan 1	undo port trunk permit vlan 1	Remove the interface from VLAN 1.	N/A
port lacp system-priority 101	port lacp system-priority 100	Set the LACP priority.	Set different LACP priorities for different M-LAG member devices, so that only member ports with a higher priority are selected upon brain split.
quit	quit	Return to system view.	N/A
interface vlan-interface 10	interface vlan-interface 10	Create VLAN-interface 10.	N/A
ip address 10.1.1.1 255.255.255.0	ip address 10.1.1.1 255.255.255.0	Assign an IPv4 address to VLAN-interface 10. The VLAN interface will act as a dual-active gateway interface.	N/A
mac-address 0010-0010-0070	mac-address 0010-0010-0070	Assign a MAC address to VLAN-interface 10.	N/A
quit	quit	Return to system view.	N/A
m-lag mad exclude interface vlan-interface10	m-lag mad exclude interface vlan-interface10	Exclude VLAN-interface 10 from the shutdown action by M-LAG MAD.	N/A
interface vlan-interface 20	interface vlan-interface 20	Create VLAN-interface 20.	N/A
ip address 20.1.1.1 255.255.255.0	ip address 20.1.1.1 255.255.255.0	Assign an IPv4 address to VLAN-interface 20.	N/A
mac-address 0010-0010-0071	mac-address 0010-0010-0071	Assign a MAC address to VLAN-interface 20.	N/A
quit	quit	Return to system view.	N/A
m-lag mad exclude interface vlan-interface20	m-lag mad exclude interface vlan-interface20	Exclude VLAN-interface 20 from the shutdown action by M-LAG MAD.	N/A

Configuring Device C and Device D

Device C	Device D	Description	Remarks
vlan 20 30	vlan 20 30	Create VLAN 20 and VLAN 30.	N/A
interface bridge-aggregation 1	interface bridge-aggregation 1	Enter aggregate interface view.	N/A
port link-type trunk	port link-type trunk	Set the link type of the Layer 2 aggregate interface to trunk.	N/A
port trunk permit vlan 20	port trunk permit vlan 20	Assign the interface to VLAN 20.	N/A
undo port trunk permit vlan 1	undo port trunk permit vlan 1	Remove the interface from VLAN 1.	N/A
port lacp system-priority 101	port lacp system-priority 100	Set the LACP priority.	Set different LACP priorities for different M-LAG member devices, so that only member ports with a higher priority are selected upon brain split.
quit	quit	Return to system view.	N/A
interface bridge-aggregation 2	interface bridge-aggregation 2	Enter aggregate interface view.	N/A
port link-type trunk	port link-type trunk	Set the link type of the Layer 2 aggregate interface to trunk.	N/A
port trunk permit vlan 30	port trunk permit vlan 30	Assign the interface to VLAN 30.	N/A
undo port trunk permit vlan 1	undo port trunk permit vlan 1	Remove the interface from VLAN 1.	N/A
port lacp system-priority 101	port lacp system-priority 100	Set the LACP priority.	Set different LACP priorities for different M-LAG member devices, so that only member ports with a higher priority are selected upon brain split.
quit	quit	Return to system view.	N/A
interface vlan-interface 20	interface vlan-interface 20	Create VLAN-interface 20.	N/A
ip address 20.1.1.2 255.255.255.0	ip address 20.1.1.2 255.255.255.0	Assign an IPv4 address to VLAN-interface 20. The VLAN interface will act as a dual-active gateway interface.	N/A
mac-address 0010-0010-0080	mac-address 0010-0010-0080	Assign a MAC address to VLAN-interface 20.	N/A
quit	quit	Return to system view.	N/A
m-lag mad exclude interface vlan-interface20	m-lag mad exclude interface vlan-interface20	Exclude VLAN-interface 20 from the shutdown action by M-LAG MAD.	N/A
interface vlan-interface 30	interface vlan-interface 30	Create VLAN-interface 30.	N/A
ip address 30.1.1.1 255.255.255.0	ip address 30.1.1.1 255.255.255.0	Assign an IPv4 address to VLAN-interface 30.	N/A
mac-address 0010-0010-0081	mac-address 0010-0010-0081	Assign a MAC address to VLAN-interface 30.	N/A
quit	quit	Return to system view.	N/A
m-lag mad exclude interface vlan-interface30	m-lag mad exclude interface vlan-interface30	Exclude VLAN-interface 30 from the shutdown action by M-LAG MAD.	N/A

Configuring OSPF for establishing Layer 3 connectivity between M-LAG member devices

Configuring Device A and Device B

Device A	Device B	Description	Remarks
router id 5.5.5.5	router id 6.6.6.6	Configure a router ID.	N/A
ospf 1	ospf 1	Enable an OSPF process.	N/A
area 0	area 0	Configure an OSPF area.	N/A
quit	quit	Return to system view.	N/A
interface vlan-interface 10	interface vlan-interface 10	Enter VLAN interface view.	N/A
port m-lag virtual-ip 10.1.1.100 255.255.255.0 active	port m-lag virtual-ip 10.1.1.101 255.255.255.0 active	Assign an M-LAG virtual IP address to the VLAN interface.	The IPv4 address is used to set up an OSPF neighbor relationship with Device F.
ospf 1 area 0.0.0.0	ospf 1 area 0.0.0.0	Enable OSPF on the interface.	N/A
ospf peer sub-address enable 10.1.1.100	ospf peer sub-address enable 10.1.1.101	Enable OSPF to establish neighbor relationships through the secondary IP addresses of the interface.	Because the same gateway interface on different M-LAG member devices use the same IP address and MAC address, the M-LAG member devices cannot establish a routing neighbor relationship with other devices by using their primary IP addresses. You must enable OSPF to establish neighbor relationships through the secondary IP addresses of the interface.
quit	quit	Return to system view.	N/A
interface vlan-interface 20	interface vlan-interface 20	Enter VLAN interface view.	N/A
port m-lag virtual-ip 20.1.1.100 255.255.255.0 active	port m-lag virtual-ip 20.1.1.101 255.255.255.0 active	Assign an M-LAG virtual IP address to the VLAN interface.	The IPv4 address is used to set up OSPF neighbor relationships with Device C and Device D.
ospf 1 area 0.0.0.0	ospf 1 area 0.0.0.0	Enable OSPF on the interface.	N/A
ospf peer sub-address enable 20.1.1.100	ospf peer sub-address enable 20.1.1.101	Enable OSPF to establish neighbor relationships through the secondary IP addresses of the interface.	Because the same gateway interface on different M-LAG member devices use the same IP address and MAC address, the M-LAG member devices cannot establish a routing neighbor relationship with other devices by using their primary IP addresses. You must enable OSPF to establish neighbor relationships through the secondary IP addresses of the interface.
quit	quit	Return to system view.	N/A

Configuring Device C and Device D

Device C	Device D	Description	Remarks
router id 3.3.3.3	router id 4.4.4.4	Configure a router ID.	N/A
ospf 1	ospf 1	Enable an OSPF process.	N/A
area 0	area 0	Configure an OSPF area.	N/A
quit	quit	Return to system view.	N/A
interface vlan-interface 20	interface vlan-interface 20	Enter VLAN interface view.	N/A
port m-lag virtual-ip 20.1.1.102 255.255.255.0 active	port m-lag virtual-ip 20.1.1.103 255.255.255.0 active	Assign an M-LAG virtual IP address to the VLAN interface.	The IPv4 address is used to set up OSPF neighbor relationships with Device A and Device B.
ospf 1 area 0.0.0.0	ospf 1 area 0.0.0.0	Enable OSPF on the interface.	N/A
ospf peer sub-address enable 20.1.1.102	ospf peer sub-address enable 20.1.1.103	Enable OSPF to establish neighbor relationships through the secondary IP addresses of the interface.	Because the same gateway interface on different M-LAG member devices use the same IP address and MAC address, the M-LAG member devices cannot establish a routing neighbor relationship with other devices by using their primary IP addresses. You must enable OSPF to establish neighbor relationships through the secondary IP addresses of the interface.
quit	quit	Return to system view.	N/A
interface vlan-interface 30	interface vlan-interface 30	Enter VLAN interface view.	N/A
port m-lag virtual-ip 30.1.1.100 255.255.255.0 active	port m-lag virtual-ip 30.1.1.101 255.255.255.0 active	Assign an M-LAG virtual IP address to the VLAN interface.	The IPv4 address is used to set up OSPF neighbor relationships with Device C and Device D.
ospf 1 area 0.0.0.0	ospf 1 area 0.0.0.0	Enable OSPF on the interface.	N/A
ospf peer sub-address enable 30.1.1.100	ospf peer sub-address enable 30.1.1.101	Enable OSPF to establish neighbor relationships through the secondary IP addresses of the interface.	Because the same gateway interface on different M-LAG member devices use the same IP address and MAC address, the M-LAG member devices cannot establish a routing neighbor relationship with other devices by using their primary IP addresses. You must enable OSPF to establish neighbor relationships through the secondary IP addresses of the interface.
quit	quit	Return to system view.	N/A

Configuring Device E

Device E	Description
router id 1.1.1.1	Configure a router ID.
ospf 1	Enable an OSPF process.
area 0	Configure an OSPF area.
network 30.1.1.0 0.0.0.255	Enable OSPF for a network.
network 40.1.0.0 0.0.255.255	Enable OSPF for a network.
quit	Return to system view.

Configuring Device F

Device F	Description
router id 2.2.2.2	Configure a router ID.
ospf 1	Enable an OSPF process.
area 0	Configure an OSPF area.
network 10.1.1.0 0.0.0.255	Enable OSPF for a network.
network 50.1.1.0 0.0.0.255	Enable OSPF for a network.
quit	Return to system view.

Configuring Layer 3 multicast

Configuring Device A and Device B

Device A	Device B	Description
multicast routing	multicast routing	Enable IP multicast routing.
igmp-snooping	igmp-snooping	Enable IGMP snooping.
Vlan 10	Vlan 10	N/A
igmp-snooping enable	igmp-snooping enable	Enable IGMP snooping in the VLAN.
Vlan 20	Vlan 20	N/A
igmp-snooping enable	igmp-snooping enable	Enable IGMP snooping in the VLAN.
interface vlan-interface10	interface vlan-interface10	Enable VLAN interface view.
pim sm	pim sm	Enable PIM SM.
pim distributed-dr	pim distributed-dr	(Optional.) Configure the interface as a DR interface to forward multicast traffic. This command is not supported by the S12500X-AF, S12500F-AF, or S6890 switches.
pim passive	pim passive	(Optional.) Enable PIM passive mode for the interface to forward multicast traffic. Execute this command only on the S12500X-AF, S12500F-AF, or S6890 switch.
quit	quit	N/A
interface vlan-interface20	interface vlan-interface20	Enable VLAN interface view.
pim sm	pim sm	Enable PIM SM.
pim distributed-dr	pim distributed-dr	(Optional.) Configure the interface as a DR interface to forward multicast traffic. This command is not supported by the S12500X-AF, S12500F-AF, or S6890 switches.
pim passive	pim passive	(Optional.) Enable PIM passive mode for the interface to forward multicast traffic. Execute this command only on the S12500X-AF, S12500F-AF, or S6890 switch.
quit	quit	N/A
pim	pim	Enter PIM view.
static-rp 5.5.5.5	static-rp 5.5.5.5	Configure a static RP.

Configuring Device C and Device D

Device C	Device D	Description
multicast routing	multicast routing	Enable IP multicast routing.
igmp-snooping	igmp-snooping	Enable IGMP snooping.
Vlan 20	Vlan 20	N/A
igmp-snooping enable	igmp-snooping enable	Enable IGMP snooping in the VLAN.
Vlan 30	Vlan 30	N/A
igmp-snooping enable	igmp-snooping enable	Enable IGMP snooping in the VLAN.
interface vlan-interface20	interface vlan-interface20	Enable VLAN interface view.
pim sm	pim sm	Enable PIM SM.
pim distributed-dr	pim distributed-dr	(Optional.) Configure the interface as a DR interface to forward multicast traffic. This command is not supported by the S12500X-AF, S12500F-AF, or S6890 switches.
pim passive	pim passive	(Optional.) Enable PIM passive mode for the interface to forward multicast traffic. Execute this command only on the S12500X-AF, S12500F-AF, or S6890 switch.
quit	quit	N/A
interface vlan-interface30	interface vlan-interface30	Enable VLAN interface view.
pim sm	pim sm	Enable PIM SM.
pim distributed-dr	pim distributed-dr	(Optional.) Configure the interface as a DR interface to forward multicast traffic. This command is not supported by the S12500X-AF, S12500F-AF, or S6890 switches.
pim passive	pim passive	(Optional.) Enable PIM passive mode for the interface to forward multicast traffic. Execute this command only on the S12500X-AF, S12500F-AF, or S6890 switch.
quit	quit	N/A
pim	pim	Enter PIM view.
static-rp 5.5.5.5	static-rp 5.5.5.5	Configure a static RP.

Configuring Device E

Device E	Description
multicast routing	Enable IP multicast routing.
igmp-snooping	Enable IGMP snooping.
Vlan 30	N/A
igmp-snooping enable	Enable IGMP snooping in the VLAN.
Vlan 40	N/A
igmp-snooping enable	Enable IGMP snooping in the VLAN.
interface vlan-interface30	Enable VLAN interface view.
pim sm	Enable PIM SM.
quit	N/A
interface vlan-interface40	Enable VLAN interface view.
pim sm	Enable PIM SM.
igmp enable	Enable IGMP.
quit	N/A

Configuring Device F

Device F	Description
multicast routing	Enable IP multicast routing.
igmp-snooping	Enable IGMP snooping.
Vlan 10	N/A
igmp-snooping enable	Enable IGMP snooping in the VLAN.
Vlan 50	N/A
igmp-snooping enable	Enable IGMP snooping in the VLAN.
interface vlan-interface10	Enable VLAN interface view.
pim sm	Enable PIM SM.
quit	N/A
interface vlan-interface50	Enable VLAN interface view.
pim sm	Enable PIM SM.
quit	N/A

Traffic forwarding models

Underlay traffic characteristics

The forwarding model matrix provides the following characteristics of underlay traffic:

· No.—Traffic number in the U-X-XXX format:

¡ U—Underlay traffic.

¡ X—Protocol number, which can be 4 (IPv4).

¡ XXX—Traffic sequence number.

· Traffic type—Type of underlay traffic, which can only be IPv4 known unicast

· Direction—Direction of underlay traffic. The value is south-north, which indicates traffic from the south to north.

· Forwarding path—Nodes that underlay traffic traverses.

· Traffic simulation—Traffic simulation method. Typically, a tester is used to simulate server traffic.

· Load—Traffic size, which can be light (less than 1000 flows) and heavy (more than 1000 flows).

· Traffic direction to firewalls/LB—No firewalls or LBs are used in this example. This field is not involved.

Forwarding models

No.	Traffic type	Direction	Forwarding path	Traffic simulation	Load	Traffic direction to firewalls/LB
U-4-101	IPv4 known multicast	South-north	Device F > Device A and Device B > Device C and Device D > Device E	Tester	Light	N/A

Testing network convergence upon single points of failure

Table 2 Network convergence upon single points of failure

Device	Failure type	Traffic interruption time
M-LAG	Single point of failure on M-LAG member links	≤ 100 ms
	Single point of failure restored on M-LAG member links	≤ 100 ms
	Peer link failure	≤ 500 ms
	Peer link failure restored	≤ 100 ms
	Keepalive link failure	0 ms
	Keepalive link failure restored	0 ms
	Keepalive link and peer link failure	≤ 1000 ms
	Keepalive link and peer link restored	≤ 10000 ms
	Upgrading the devices	≤ 10000 ms (upgrade the M-LAG member devices one after another)
	Replacing hardware	Fixed-port device: ≤ 10000 ms

Verifying the configuration

Verifying the status of the M-LAG system

Verify that the M-LAG system is working correctly on Device A and Device B. Use Device A as an example.

# Display summary information about the peer-link interface and M-LAG interface.

[DeviceA]display m-lag summary

Flags: A -- Aggregate interface down, B -- No peer M-LAG interface configured

C -- Configuration consistency check failed

Peer-link interface: BAGG3

Peer-link interface state (cause): UP

Keepalive link state (cause): UP

M-LAG interface information

M-LAG IF M-LAG group Local state (cause) Peer state Remaining down time(s)

BAGG1 1 UP UP -

BAGG2 2 UP UP -

# Verify that keepalive link is working correctly.

[DeviceA]display m-lag keepalive

Neighbor keepalive link status (cause): Up

Neighbor is alive for: 102480 s 811 ms

Keepalive packet transmission status:

Sent: Successful

Received: Successful

Last received keepalive packet information:

Source IP address: 221.1.3.2

Time: 2023/02/16 19:28:27

Action: Accept

M-LAG keepalive parameters:

Destination IP address: 221.1.3.2

Source IP address: 221.1.3.1

Keepalive UDP port : 6400

Keepalive VPN name : N/A

Keepalive interval : 1000 ms

Keepalive timeout : 5 sec

Keepalive hold time: 3 sec

# Display the M-LAG system information.

[DeviceA]display m-lag system

System information

Local system number: 1 Peer system number: 2

Local system MAC: 0001-0001-0003 Peer system MAC: 0001-0001-0003

Local system priority: 123 Peer system priority: 123

Local bridge MAC: 00ec-fc00-050a Peer bridge MAC: 00ec-fc00-050b

Local effective role: Primary Peer effective role: Secondary

Health level: 0

Standalone mode on split: Enabled

In standalone mode: No

System timer information

Timer State Value (s) Remaining time (s)

Auto recovery Disabled - -

Restore delay Disabled 60 -

Consistency-check delay Disabled 30 -

Standalone delay Disabled 0 -

Role to None delay Disabled 60 -

# Display detailed information about the peer-link interface and M-LAG interfaces.

[DeviceA]display m-lag verbose

Flags: A -- Home_Gateway, B -- Neighbor_Gateway, C -- Other_Gateway,

D -- PeerLink_Activity, E -- DRCP_Timeout, F -- Gateway_Sync,

G -- Port_Sync, H -- Expired

Peer-link interface/Peer-link interface ID: BAGG3/1

State: UP

Cause: -

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

Local Selected ports (index): HGE1/0/26 (25)

Peer Selected ports indexes: 220

M-LAG interface/M-LAG group ID: BAGG1/1

Local M-LAG interface state: UP

Peer M-LAG interface state: UP

M-LAG group state: UP

Local M-LAG interface down cause: -

Remaining M-LAG DOWN time: -

Local M-LAG interface LACP MAC: Config=N/A, Effective=0001-0001-0003

Peer M-LAG interface LACP MAC: Config=N/A, Effective=0001-0001-0003

Local M-LAG interface LACP priority: Config=32768, Effective=123

Peer M-LAG interface LACP priority: Config=32768, Effective=123

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

Local Selected ports (index): HGE1/0/27 (26), HGE1/0/30 (37)

Peer Selected ports indexes: 221, 232

M-LAG interface/M-LAG group ID: BAGG2/2

Local M-LAG interface state: UP

Peer M-LAG interface state: UP

M-LAG group state: UP

Local M-LAG interface down cause: -

Remaining M-LAG DOWN time: -

Local M-LAG interface LACP MAC: Config=N/A, Effective=0001-0001-0003

Peer M-LAG interface LACP MAC: Config=N/A, Effective=0001-0001-0003

Local M-LAG interface LACP priority: Config=32768, Effective=123

Peer M-LAG interface LACP priority: Config=32768, Effective=123

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

Local Selected ports (index): HGE1/0/30 (6)

Peer Selected ports indexes: 238

Verifying routing configuration

# Verify that OSPF neighbor relationships are correctly set up.

[DeviceA]dis ospf peer

OSPF Process 1 with Router ID 5.5.5.5

Neighbor Brief Information

Area: 0.0.0.0

Router ID Address Pri Dead-Time State Interface

6.6.6.6 20.1.1.101 1 36 Full/BDR Vlan20

3.3.3.3 20.1.1.102 1 38 Full/DROther Vlan20

4.4.4.4 20.1.1.103 1 36 Full/DROther Vlan20

2.2.2.2 10.1.1.2 1 34 Full/BDR Vlan10

6.6.6.6 10.1.1.101 1 37 Full/DROther Vlan10

[DeviceB]display ospf peer

OSPF Process 1 with Router ID 6.6.6.6

Neighbor Brief Information

Area: 0.0.0.0

Router ID Address Pri Dead-Time State Interface

5.5.5.5 20.1.1.100 1 32 Full/DR Vlan20

3.3.3.3 20.1.1.102 1 36 Full/DROther Vlan20

4.4.4.4 20.1.1.103 1 34 Full/DROther Vlan20

2.2.2.2 10.1.1.2 1 32 Full/BDR Vlan10

5.5.5.5 10.1.1.100 1 36 Full/DR Vlan10

[DeviceC]display ospf peer

OSPF Process 1 with Router ID 3.3.3.3

Neighbor Brief Information

Area: 0.0.0.0

Router ID Address Pri Dead-Time State Interface

1.1.1.1 30.1.1.3 1 39 Full/DR Vlan30

4.4.4.4 30.1.1.101 1 38 Full/DROther Vlan30

5.5.5.5 20.1.1.100 1 38 Full/DR Vlan20

6.6.6.6 20.1.1.101 1 39 Full/BDR Vlan20

4.4.4.4 20.1.1.103 1 39 2-Way/ - Vlan20

[DeviceD]display ospf peer

OSPF Process 1 with Router ID 4.4.4.4

Neighbor Brief Information

Area: 0.0.0.0

Router ID Address Pri Dead-Time State Interface

1.1.1.1 30.1.1.3 1 36 Full/DR Vlan30

3.3.3.3 30.1.1.100 1 38 Full/BDR Vlan30

5.5.5.5 20.1.1.100 1 35 Full/DR Vlan20

6.6.6.6 20.1.1.101 1 36 Full/BDR Vlan20

3.3.3.3 20.1.1.102 1 39 2-Way/ - Vlan20

[DeviceE]dis ospf peer

OSPF Process 1 with Router ID 1.1.1.1

Neighbor Brief Information

Area: 0.0.0.0

Router ID Address Pri Dead-Time State Interface

3.3.3.3 30.1.1.100 1 39 Full/BDR Vlan30

4.4.4.4 30.1.1.101 1 37 Full/DROther Vlan30

[DeviceF]display ospf peer

OSPF Process 1 with Router ID 2.2.2.2

Neighbor Brief Information

Area: 0.0.0.0

Router ID Address Pri Dead-Time State Interface

5.5.5.5 10.1.1.100 1 37 Full/DR Vlan10

6.6.6.6 10.1.1.101 1 35 Full/DROther Vlan10

# Verify that PIM neighbor relationships are established correctly.

[DeviceA]display pim neighbor

Total Number of Neighbors = 2

Neighbor Interface Uptime Expires DR-Priority Mode

20.1.1.2 Vlan20 08:24:02 00:01:33 1 P

10.1.1.2 Vlan10 1d:00h 00:01:30 1 P

[DeviceB]display pim neighbor

Total Number of Neighbors = 2

Neighbor Interface Uptime Expires DR-Priority Mode

20.1.1.2 Vlan20 08:24:14 00:01:39 1 P

10.1.1.2 Vlan10 09:17:11 00:01:17 1 P

[DeviceC]display pim neighbor

Total Number of Neighbors = 2

Neighbor Interface Uptime Expires DR-Priority Mode

30.1.1.3 Vlan30 02:13:33 00:01:24 1 P

20.1.1.1 Vlan20 02:13:32 00:01:43 1 P

[DeviceD]display pim neighbor

Total Number of Neighbors = 2

Neighbor Interface Uptime Expires DR-Priority Mode

30.1.1.3 Vlan30 02:04:36 00:01:43 1 P

20.1.1.1 Vlan20 02:04:50 00:01:31 1 P

[DeviceE]display pim neighbor

Total Number of Neighbors = 1

Neighbor Interface Uptime Expires DR-Priority Mode

30.1.1.1 Vlan30 03:16:01 00:01:33 1 P

[DeviceF]display pim neighbor

Total Number of Neighbors = 1

Neighbor Interface Uptime Expires DR-Priority Mode

10.1.1.1 Vlan10 1d:00h 00:01:39 1 P

# Verify that multicast forwarding entries are generated.

<DeviceA> display multicast forwarding-table

Total 1 entries, 1 matched

00001. (10.1.1.2, 227.0.0.1)

Flags: 0x0

Uptime: 00:08:32, Timeout in: 00:03:26

Incoming interface: Vlan-interface10

List of 1 outgoing interfaces:

1: Vlan-interface20

Matched 19648 packets(20512512 bytes), Wrong If 0 packet

Forwarded 19648 packets(20512512 bytes)

<DeviceB> display multicast forwarding-table

Total 1 entries, 1 matched

00001. (10.1.1.2, 227.0.0.1)

Flags: 0x0

Uptime: 00:08:32, Timeout in: 00:03:26

Incoming interface: Vlan-interface10

List of 1 outgoing interfaces:

1: Vlan-interface20

Matched 19648 packets(20512512 bytes), Wrong If 0 packet

Forwarded 19648 packets(20512512 bytes)

<DeviceC> display multicast forwarding-table

Total 1 entries, 1 matched

00001. (10.1.1.2, 227.0.0.1)

Flags: 0x0

Uptime: 00:08:32, Timeout in: 00:03:26

Incoming interface: Vlan-interface20

List of 1 outgoing interfaces:

1: Vlan-interface30

Matched 19648 packets(20512512 bytes), Wrong If 0 packet

Forwarded 19648 packets(20512512 bytes)

<DeviceD> display multicast forwarding-table

Total 1 entries, 1 matched

00001. (10.1.1.2, 227.0.0.1)

Flags: 0x0

Uptime: 00:08:32, Timeout in: 00:03:26

Incoming interface: Vlan-interface20

List of 1 outgoing interfaces:

1: Vlan-interface30

Matched 19648 packets(20512512 bytes), Wrong If 0 packet

Forwarded 19648 packets(20512512 bytes)

# Verify that PIM multicast forwarding entries are generated.

<DeviceA> display pim routing-table

Total 0 (*, G) entries; 1 (S, G) entries

(10.1.1.2, 227.0.0.1)

RP: 5.5.5.5

Protocol: pim-sm, Flag: SPT LOC ACT

UpTime: 02:54:43

Upstream interface: Vlan-interface10

Upstream neighbor: NULL

RPF prime neighbor: NULL

Downstream interface information:

Total number of downstream interfaces: 1

1: Vlan-interface20

Protocol: pim-sm, UpTime: 02:54:43, Expires: 00:02:47

<DeviceB> display pim routing-table

Total 0 (*, G) entries; 1 (S, G) entries

(10.1.1.2, 227.0.0.1)

RP: 5.5.5.5

Protocol: pim-sm, Flag: SPT LOC ACT

UpTime: 02:54:43

Upstream interface: Vlan-interface10

Upstream neighbor: NULL

RPF prime neighbor: NULL

Downstream interface information:

Total number of downstream interfaces: 1

1: Vlan-interface20

Protocol: pim-sm, UpTime: 02:54:43, Expires: 00:02:47

<DeviceC> display pim routing-table

Total 0 (*, G) entries; 1 (S, G) entries

(10.1.1.2, 227.0.0.1)

RP: 5.5.5.5

Protocol: pim-sm, Flag: SPT LOC ACT

UpTime: 02:54:43

Upstream interface: Vlan-interface20

Upstream neighbor: NULL

RPF prime neighbor: NULL

Downstream interface information:

Total number of downstream interfaces: 1

1: Vlan-interface30

Protocol: pim-sm, UpTime: 02:54:43, Expires: 00:02:47

<DeviceD> display pim routing-table

Total 0 (*, G) entries; 1 (S, G) entries

(10.1.1.2, 227.0.0.1)

RP: 5.5.5.5

Protocol: pim-sm, Flag: SPT LOC ACT

UpTime: 02:54:43

Upstream interface: Vlan-interface20

Upstream neighbor: NULL

RPF prime neighbor: NULL

Downstream interface information:

Total number of downstream interfaces: 1

1: Vlan-interface30

Protocol: pim-sm, UpTime: 02:54:43, Expires: 00:02:47

Upgrading the devices

Checking the environment

Execute the commands in "Verifying the configuration" and the following commands to verify that the devices are available for an upgrade.

M-LAG 1	M-LAG 2	Description
display device	display device	Displays device information.
display boot-loader	display boot-loader	Displays current software images and startup software images.
display version	display version	Displays system version information.

Upgrading the devices

See H3C Switches M-LAG System Upgrade & Replacement & Expansion Guide.

Verifying the traffic interruption time during the upgrade

See "Testing network convergence upon single points of failure."

Verifying the upgrade result

Execute the commands in "Verifying the configuration" and the following commands to verify that the device is upgraded successfully.

M-LAG 1	M-LAG 2	Description
display device	display device	Displays device information.
display boot-loader	display boot-loader	Displays current software images and startup software images.
display version	display version	Displays system version information.

Replacing hardware

Replacing a service module

Checking the environment

Execute the commands in "Verifying the configuration" and the following commands to verify that the device is available for a replacement.

M-LAG 1	M-LAG 2	Description
display device	display device	Displays device information.
display boot-loader	display boot-loader	Displays current software images and startup software images.
display version	display version	Displays system version information.

Replacing hardware

Switch service and management traffic on the target service module to other service modules.

Power off the device and replace the service module, or replace the service module when the device is running. For more information, see the installation guides for the service module.

For details, see H3C Switches M-LAG System Upgrade & Replacement & Expansion Guide.

Verifying the traffic interruption time

For more information, see "Testing network convergence upon single points of failure."

Verifying the replacement result

Execute the commands in "Checking the environment."

Replacing a switching fabric module

Checking the environment

Execute the commands in "Verifying the configuration" and the following commands to verify that the device is available for a replacement.

M-LAG 1	M-LAG 2	Description
display device	display device	Displays device information.
display boot-loader	display boot-loader	Displays current software images and startup software images.
display version	display version	Displays system version information.

Replacing hardware

Verifying the traffic interruption time

For more information, see "Testing network convergence upon single points of failure."

Verifying the replacement result

Execute the commands in "Checking the environment."

Replace a device

Checking the environment

Execute the commands in "Verifying the configuration" and the following commands to verify that the device is available for a replacement.

M-LAG 1	M-LAG 2	Description
display device	display device	Displays device information.
display boot-loader	display boot-loader	Displays current software images and startup software images.
display version	display version	Displays system version information.

Replacing hardware

See H3C Switches M-LAG System Upgrade & Replacement & Expansion Guide.

Verifying the traffic interruption time

For more information, see "Testing network convergence upon single points of failure."

Verifying the replacement result

Execute the commands in "Checking the environment."

H3C Data Center Switches M-LAG Configuration Guide-6W101

Configuring Device A and Device B

Configuring Device C and Device D

Configuring Device A and Device B

Configuring Device C and Device D

Configuring Device A and Device B

Configuring Device C and Device D

Replacing hardware

Verifying the traffic interruption time

Verifying the replacement result

Replacing hardware

Verifying the traffic interruption time

Verifying the replacement result

Replacing hardware

Verifying the traffic interruption time

Verifying the replacement result

Configuring Device A and Device B

Configuring Device C and Device D

Configuring Device A and Device B

Configuring Device C and Device D

Configuring OSPF for establishing Layer 3 connectivity between M-LAG member devices

Configuring Device A and Device B

Configuring Device C and Device D

Configuring Device E

Configuring Device F

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Replacing hardware

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Verifying the replacement result

Replacing hardware

Verifying the traffic interruption time

Verifying the replacement result

Replacing hardware

Verifying the traffic interruption time

Verifying the replacement result

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