· If the link between Device A or Device B and uplink device Device C fails, packets can be transmitted along the other M-LAG member device to Device C to avoid interrupting the servers’ communication with the external network.

In some scenarios, the devices or servers attached to the M-LAG interfaces are required to establish routing peer relationships with the M-LAG member devices.

Figure 1 Network diagram

Table 1 Topology and IP assignment

Device	Interface	IP address	Peer device and interface
Device A	HGE1/0/1	N/A	Device D: HGE1/0/1
	HGE1/0/2	N/A	Device D: HGE1/0/2
	HGE1/0/3	N/A	Device B: HGE1/0/3
	HGE1/0/4	N/A	Device B: HGE1/0/4
	HGE1/0/5	IPv4: 21.1.1.1/24 IPv6: 21::1/64	Device B: HGE1/0/5
	HGE1/0/6	N/A	Device C: HGE1/0/1
	HGE1/0/7	N/A	N/A
	Vlan-int100	IPv4: 100.1.1.100/24 M-LAG virtual IPv4 address: 100.1.1.101/24 IPv6: 100::100/64 M-LAG virtual IPv6 address: 100::101	N/A
	Vlan-int101	IPv4: 101.1.1.1/24 IPv6: 101::1/64	Device B: Vlan-int101 · IPv4: 101.1.1.2/24 · IPv6: 101::2/64
	Vlan-int32	IPv4: 32.1.1.1/24 IPv6: 32::1/64	Device C: Vlan-int32 · IPv4: 32.1.1.2/24 · IPv6: 32::2/64
Device B	HGE1/0/1	N/A	Device D: HGE1/0/3
	HGE1/0/2	N/A	Device D: HGE1/0/4
	HGE1/0/3	N/A	Device A: HGE1/0/3
	HGE1/0/4	N/A	Device A: HGE1/0/4
	HGE1/0/5	IPv4: 21.1.1.2/24 IPv6: 21::2/64	Device A: HGE1/0/5
	HGE1/0/6	N/A	Device C: HGE1/0/2
	Vlan-int100	IPv4: 100.1.1.100/24 M-LAG virtual IPv4 address: 100.1.1.102/24 IPv6: 100::100/64 M-LAG virtual IPv6 address: 100::102	N/A
	Vlan-int101	IPv4: 101.1.1.2/24 IPv6: 101::2/64	Device A: Vlan-int101 · IPv4: 101.1.1.1/24 · IPv6: 101::1/64
	Vlan-int33	IPv4: 33.1.1.1/24 IPv6: 33::1/64	Device C: Vlan-int33 · IPv4: 33.1.1.2/24 · IPv6: 33::2/64
Device C	HGE1/0/1	N/A	Device A: HGE1/0/6
	HGE1/0/2	N/A	Device B: HGE1/0/6
	HGE1/0/3	N/A	Network
	Vlan-int22	IPv4: 22.1.1.1/24 IPv6: 22::1/64	Network
	Vlan-int32	IPv4: 32.1.1.2/24 IPv6: 32::2/64	Device A: Vlan-int32 · IPv4: 32.1.1.1/24 · IPv6: 32::1/64
	Vlan-int33	IPv4: 33.1.1.2/24 IPv6: 33::2/64	Device B: Vlan-int33 · IPv4: 33.1.1.1/24 · IPv6: 33::1/64
Device D	HGE1/0/1	N/A	Device A: HGE1/0/1
	HGE1/0/2	N/A	Device A: HGE1/0/2
	HGE1/0/3	N/A	Device B: HGE1/0/1
	HGE1/0/4	N/A	Device B: HGE1/0/2
	Vlan-int100	IPv4: 100.1.1.110/24 IPv6: 100::110	Routing peers to the M-LAG virtual IP addresses assigned to VLAN-interface 100 on the M-LAG member devices

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, S9820-64H, S9820-8C	R6710
S6800, S6860	R6710
S12500X-AF, S6890	R2825
S12500G-AF	R7625
S6812, S6813	F6628P22 and higher

Analysis

· Configure VLAN-interface 100 on Device A and Device B to act as the IPv4 and IPv6 dual-active gateways. To enable IPv4 and IPv6 users to access the external network through the gateways, configure the same IPv4 address, MAC address, IPv6 address, and IPv6 link-local address for VLAN-interface 100 on Device A and Device B.

· Enable Device A and Device B to communicate at Layer 3 through VLAN-interface 101. Then, packets can be routed to the other M-LAG member device when the link between Device A or Device B and uplink device Device C fails.

Restrictions and guidelines

All the devices were started with the factory default configuration. When you are working on a live network, make sure the existing configuration does not conflict with the following configuration.

The M-LAG system MAC address must be the same for devices in the same M-LAG system. The M-LAG system MAC addresses must be different for devices in different M-LAG systems.

For how to set the MAC addresses for dual-active gateways on S12500X-AF series switches, see S12500X-AF MAC address configuration guide in the recommended M-LAG networking solutions.

Configuring the M-LAG system

Procedure summary

· Configuring the interconnect links between the M-LAG system and the downlink device Device D

· Configuring the dual-active gateways

· Configuring Layer 3 communication between M-LAG member devices

· Configuring the interconnect links between the M-LAG system and the uplink device Device C

· Configuring the single-homed interface of the M-LAG system

· Configuring a dynamic routing protocol used for communication with Device D

Configuring the interconnect links between the M-LAG system and the downlink device Device D

Device A	Device B	Description	Remarks
m-lag system-mac 2-2-2	m-lag system-mac 2-2-2	Set the M-LAG system MAC address.	You must set 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 21.1.1.2 source 21.1.1.1	m-lag keepalive ip destination 21.1.1.1 source 21.1.1.2	Configure the destination and source IP addresses of keepalive packets.	N/A
stp instance 0 root primary	stp instance 0 root primary-	Configure the M-LAG member device as the root STP bridge.	N/A
stp global enable	stp global enable	Enable spanning tree globally.	N/A
stp tc-protection	stp tc-protection	Enable the TC-BPDU guard feature.	To prevent the device from frequently deleting MAC address entries and ARP entries and thus protect the device, enable this feature.
stp bpdu-protection	stp bpdu-protection	Enable BPDU guard globally.	N/A
interface HundredGigE1/0/5	interface HundredGigE1/0/5	Enter the interface view for the keepalive link.	N/A
port link-mode route	port link-mode route	Configure the interface for the keepalive link to operate in route mode as a Layer 3 interface.	N/A
ip address 21.1.1.1 24	ip address 21.1.1.2 24	Configure the source IPv4 address of keepalive packets.	N/A
quit	quit	N/A	N/A
m-lag mad exclude interface HundredGigE1/0/5	m-lag mad exclude interface HundredGigE1/0/5	Exclude the interface used for M-LAG keepalive detection from the shutdown action by M-LAG MAD.	N/A
interface bridge-aggregation 1	interface bridge-aggregation 1	Create the Layer 2 aggregate interface to be used as the peer-link interface and enter interface view.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the aggregate interface to operate in dynamic mode.	N/A
quit	quit	N/A	N/A
interface range HundredGigE 1/0/3 HundredGigE 1/0/4	interface range HundredGigE 1/0/3 HundredGigE 1/0/4	Enter the view of physical interfaces on the peer link.	N/A
port link-aggregation group 1	port link-aggregation group 1	Assign the physical interfaces on the peer link to the aggregation group for the peer link (aggregation group 1).	N/A
interface bridge-aggregation 1	interface bridge-aggregation 1	N/A	N/A
port m-lag peer-link 1	port m-lag peer-link 1	Specify the aggregate interface (Bridge-Aggregation 1) as the peer-link interface.	N/A
undo mac-address static source-check enable	undo mac-address static source-check enable	Disable the static source check feature to avoid inter-peer link Layer 3 traffic forwarding failures.	You do not need to execute this command on an S12500X-AF, S12500G-AF, or S6890 switch, because inter-peer link Layer 3 traffic forwarding failures do not exist on these switches.
quit	quit	N/A	N/A
interface bridge-aggregation 3	interface bridge-aggregation 3	Create an aggregate interface connecting to Device D.	N/A
link-aggregation mode dynamic	link-aggregation mode dynamic	Configure the aggregate interface connecting to Device D to operate in dynamic mode.	N/A
port m-lag group 1	port m-lag group 1	Assign the Layer 2 aggregate interface (Bridge-Aggregation 3) to M-LAG group 1.	N/A
quit	quit	N/A	N/A
interface range HundredGigE 1/0/1 HundredGigE 1/0/2	interface range HundredGigE 1/0/1 HundredGigE 1/0/2	Enter the view of the physical interfaces connecting the M-LAG system to Device D.	N/A
port link-aggregation group 3	port link-aggregation group 3	Assign the interfaces to an M-LAG group.	N/A
quit	quit	N/A	N/A
m-lag restore-delay 300	m-lag restore-delay 300	Set the data restoration interval.	The data restoration interval specifies the maximum amount of time for the secondary M-LAG member device to synchronize data with the primary M-LAG member device during M-LAG system setup.

Configuring the dual-active gateways

Device A	Device B	Description
vlan 100 101	vlan 100 101	Create VLAN 100 and VLAN 101.
interface bridge-aggregation 3	interface bridge-aggregation 3	N/A
port link-type trunk	port link-type trunk	Set the link type of the Layer 2 aggregate interface (Bridge-Aggregation 3) to trunk.
port trunk permit vlan 100	port trunk permit vlan 100	Assign the interface to VLAN 100.
port lacp system-priority 100	port lacp system-priority 101	Set the LACP system priority, so that only member ports with higher priority are selected when both peer link and keepalive link fail.
quit	quit	N/A
interface bridge-aggregation 1	interface bridge-aggregation 1	N/A
port link-type trunk	port link-type trunk	Set the link type of the Layer 2 aggregate interface (Bridge-Aggregation 1) to trunk.
port trunk permit vlan all	port trunk permit vlan all	Assign the interface to all VLANs.
quit	quit	N/A
interface vlan-interface 100	interface vlan-interface 100	Create VLAN-interface 100.
ip address 100.1.1.100 24	ip address 100.1.1.100 24	Assign an IPv4 address to VLAN-interface 100, which is to act as an IPv4 dual-active gateway.
mac-address 0000-0010-0010	mac-address 0000-0010-0010	Assign a MAC address to VLAN-interface 100, which is to act as an IPv4 dual-active gateway.
ipv6 address 100::100 64	ipv6 address 100::100 64	Assign an IPv6 address to VLAN-interface 100, which is to act as an IPv6 dual-active gateway.
ipv6 address FE80::80 link-local	ipv6 address FE80::80 link-local	Assign a link-local address to VLAN-interface 100, which is to act as an IPv6 dual-active gateway.
ipv6 nd unsolicited-na-learning enable	ipv6 nd unsolicited-na-learning enable	Enable unsolicited NA learning. For ND entries to be synchronous on M-LAG member devices, enable this feature.
quit	quit	N/A
m-lag mad exclude interface Vlan-interface100	m-lag mad exclude interface Vlan-interface100	Exclude VLAN-interface100 from the shutdown action by M-LAG MAD.
interface vlan-interface 101	interface vlan-interface 101	Create VLAN-interface 101.
ip address 101.1.1.1 24	ip address 101.1.1.2 24	Assign an IPv4 address to VLAN-interface 101, which is used for Layer 3 communication between M-LAG member devices.
ipv6 address 101::1 64	ipv6 address 101::2 64	Assign an IPv6 address to VLAN-interface 101, which is used for Layer 3 communication between M-LAG member devices.
quit	quit	N/A
m-lag mad exclude interface Vlan-interface101	m-lag mad exclude interface Vlan-interface101	Exclude VLAN-interface101 from the shutdown action by M-LAG MAD.

Configuring Layer 3 communication between M-LAG member devices

Device A	Device B	Description
router id 3.3.3.3	router id 4.4.4.4	Configure a router ID.
ospf 1	ospf 1	Configure OSPF to enable M-LAG member devices to communicate through an IPv4 network.
stub-router include-stub on-startup 900	stub-router include-stub on-startup 900	Specify the cost of the stub links (link type 3) in Router LSAs to the maximum value 65535 to accelerate network convergence.
silent-interface Vlan-interface 100	silent-interface Vlan-interface 100	Disable VLAN-interface 100 from receiving and sending OSPF packets.
area 0	area 0	N/A
quit	quit	N/A
interface vlan-interface 100	interface vlan-interface 100	N/A
ospf 1 area 0	ospf 1 area 0	Enable OSPF on an interface.
quit	quit	N/A
interface vlan-interface 101	interface vlan-interface 101	N/A
ospf 1 area 0	ospf 1 area 0	Enable OSPF on an interface.
quit	quit	N/A
ospfv3 1	ospfv3 1	Configure OSPFv3 to enable M-LAG member devices to communicate through an IPv6 network.
router-id 3.3.3.3	router-id 4.4.4.4	Configure a router ID.
stub-router max-metric on-startup 900	stub-router max-metric on-startup 900	Specify the cost of the links in Type-1 LSAs to the maximum value 65535 and specify the router as a stub router during reboot.
silent-interface Vlan-interface 100	silent-interface Vlan-interface 100	Disable VLAN-interface 100 from receiving and sending OSPF packets.
area 0	area 0	N/A
quit	quit	N/A
interface vlan-interface 100	interface vlan-interface 100	N/A
ospfv3 1 area 0	ospfv3 1 area 0	Enable OSPFv3 on an interface.
quit	quit	N/A
interface vlan-interface 101	interface vlan-interface 101	N/A
ospfv3 1 area 0	ospfv3 1 area 0	Enable OSPFv3 on an interface.
quit	quit	N/A

Configuring the interconnect links between the M-LAG system and the uplink device Device C

Device A	Device B	Description
vlan 32	vlan 33	Create a VLAN.
quit	quit	N/A
interface HundredGigE 1/0/6	interface HundredGigE 1/0/6	N/A
port link-type trunk	port link-type trunk	Set the link type of the interface to trunk.
port trunk permit vlan 32	port trunk permit vlan 33	Assign the interface to the specified VLANs.
undo port trunk permit vlan 1	undo port trunk permit vlan 1	Remove the interface from VLAN 1.
undo stp enable	undo stp enable	Disable STP on the uplink interface to speed up topology convergence.
quit	quit	N/A
interface vlan-interface 32	interface vlan-interface 33	Create a VLAN interface.
ip address 32.1.1.1 24	ip address 33.1.1.1 24	Assign an IPv4 address to a VLAN-interface.
ipv6 address 32::1 64	ipv6 address 33::1 64	Assign an IPv6 address to a VLAN-interface.
ospf 1 area 0	ospf 1 area 0	Enable OSPF on an interface.
ospfv3 1 area 0	ospfv3 1 area 0	Enable OSPFv3 on an interface.
quit	quit	N/A

Configuring the single-homed interface of the M-LAG system

Device A	Description
vlan 100	Create a VLAN.
quit	N/A
interface HundredGigE 1/0/7	Configure the single-homed interface.
port link-mode bridge	Configure the interface to operate in bridge mode as a Layer 2 interface.
port link-type access	Set the link type of the interface to access.
port access vlan 100	Assign the interface to the specified VLAN.

Configuring a dynamic routing protocol used for communication with Device D

Perform this task if the devices or servers attached to the M-LAG member devices are required to establish routing peer relationships with the M-LAG member devices.

Device A	Device B	Description
interface vlan-interface 100	interface vlan-interface 100	N/A
port m-lag virtual-ip 100.1.1.101 255.255.255.0 active	port m-lag virtual-ip 100.1.1.102 255.255.255.0 active	Assign an M-LAG virtual IPv4 address to this VLAN interface.
port m-lag ipv6 virtual-ip FE80::81 link-local	port m-lag ipv6 virtual-ip FE80::82 link-local	Assign an M-LAG link-local virtual IPv6 address to this VLAN interface.
port m-lag ipv6 virtual-ip 100::101 64 active	port m-lag ipv6 virtual-ip 100::102 64 active	Assign an M-LAG virtual IPv6 address to this VLAN interface, and set the state of the address to active.
ospf peer sub-address enable 100.1.1.101	ospf peer sub-address enable 100.1.1.102	Enable OSPF to use secondary IP addresses to set up peer relationships.
quit	quit	N/A

Configuring uplink device Device C

Procedure summary

· Configuring the interconnect links to the M-LAG member devices

· Configuring the interconnect links between the uplink device Device C and the network

Configuring the interconnect links to the M-LAG member devices

Device C	Description
vlan 32	Create VLAN 32.
quit	N/A
interface HundredGigE 1/0/1	N/A
port link-type trunk	Set the link type of the interface to trunk.
port trunk permit vlan 32	Assign HundredGigE 1/0/1 (which connects Device C to Device A) to VLAN 32.
undo port trunk permit vlan 1	Remove the interface from VLAN 1.
undo stp enable	Disable the spanning tree protocol to speed up topology convergence.
quit	N/A
interface vlan-interface 32	Create VLAN-interface 32.
ip address 32.1.1.2 24	Assign an IPv4 address to the VLAN-interface.
ipv6 address 32::2 64	Assign an IPv6 address to the VLAN-interface.
quit	N/A
vlan 33	Create VLAN 33.
quit	N/A
interface HundredGigE 1/0/2	N/A
port link-type trunk	Set the link type of the interface to trunk.
port trunk permit vlan 33	Assign HundredGigE 1/0/2 (which connects Device C to Device B) to VLAN 33.
undo port trunk permit vlan 1	Remove the interface from VLAN 1.
undo stp enable	Disable the spanning tree protocol to speed up topology convergence.
quit	N/A
interface vlan-interface 33	Create VLAN-interface 33.
ip address 33.1.1.2 24	Assign an IPv4 address to the VLAN-interface.
ipv6 address 33::2 64	Assign an IPv6 address to the VLAN-interface.
quit	N/A
router id 5.5.5.5	Configure a router ID.
ospf 1	Configure OSPF to enable M-LAG member devices to communicate through an IPv4 network.
stub-router include-stub on-startup 900	Specify the cost of the stub links (link type 3) in Router LSAs to the maximum value 65535 to accelerate network convergence.
area 0	N/A
quit	N/A
interface vlan-interface 32	N/A
ospf 1 area 0	Enable OSPF on the interface.
quit	N/A
interface vlan-interface 33	N/A
ospf 1 area 0	Enable OSPF on the interface.
quit	N/A
ospfv3 1	Configure OSPFv3 to enable M-LAG member devices to communicate through an IPv6 network.
router id 5.5.5.5	Configure a Router ID.
stub-router max-metric on-startup 900	Specify the cost of the links in Type-1 LSAs to the maximum value 65535 and specify the router as a stub router during reboot.
area 0	N/A
quit	N/A
interface vlan-interface 32	N/A
ospfv3 1 area 0	Enable OSPFv3 on the interface.
quit	N/A
interface vlan-interface 33	N/A
ospfv3 1 area 0	Enable OSPFv3 on the interface.
quit	N/A

Configuring the interconnect links between the uplink device Device C and the network

Device C	Description
vlan 22	Create VLAN 22.
quit	N/A
interface HundredGigE 1/0/3	N/A
port link-type trunk	Set the link type of the interface to trunk.
port trunk permit vlan 22	Assign HundredGigE 1/0/3 (which connects Device C to the network) to VLAN 22.
undo port trunk permit vlan 1	Remove the interface from VLAN 1.
undo stp enable	Disable the spanning tree protocol to speed up topology convergence.
quit	N/A
interface vlan-interface 22	Create VLAN-interface 22.
ip address 22.1.1.1 24	Assign an IPv4 address to the VLAN-interface.
ipv6 address 22::1 64	Assign an IPv6 address to the VLAN-interface.
quit	N/A

Configuring downlink device Device D

Procedure summary

· Configuring the interconnect links to the M-LAG member devices

· Setting up OSPF and OSPFv3 peer relationships with the M-LAG member devices

Configuring the interconnect links to the M-LAG member devices

Device D	Description
interface bridge-aggregation 3	Create Layer 2 aggregate interface Bridge-Aggregation 3, and enter its view.
link-aggregation mode dynamic	Configure the aggregate interface connecting to the M-LAG system to operate in dynamic mode.
quit	N/A
interface range HundredGigE 1/0/1 to HundredGigE 1/0/4	Enter the view of the physical interfaces connecting Device D to the M-LAG system.
port link-aggregation group 3	Assign interfaces to an aggregation group.
quit	N/A
vlan 100	Create VLAN 100.
quit	N/A
interface bridge-aggregation 3	N/A
port link-type trunk	Set the link type of the interface to trunk.
port trunk permit vlan 100	Assign the interface to VLAN 100.
undo port trunk permit vlan 1	Remove the interface from VLAN 1.
quit	N/A

Setting up OSPF and OSPFv3 peer relationships with the M-LAG member devices

Perform this task if the devices or servers attached to the M-LAG member devices are required to establish routing peer relationships with the M-LAG member devices.

Device D	Description
router id 6.6.6.6	Configure the router ID.
ospf 1	Configure OSPF to set up IPv4 connectivity to the M-LAG member devices.
area 0	Create an OSPF area and enter its view.
quit	N/A
interface vlan-interface 100	N/A
ip address 100.1.1.110 255.255.255.0	Assign an IPv4 address to this VLAN interface.
ipv6 address FE80::83 link-local	Assign an IPv6 link-local address to this VLAN interface.
ipv6 address 100::110 64	Assign an IPv6 address to this VLAN interface.
ospf 1 area 0.0.0.0	Enable OSPF on VLAN-interface 100.
ospfv3 1 area 0.0.0.0	Enable OSPFv3 on VLAN-interface 100.
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) or 6 (IPv6).

¡ XXX—Traffic sequence number.

· Traffic type—Type of underlay traffic, which can be IPv4 known unicast or IPv6 known unicast.

· Direction—Direction of underlay traffic.

· 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—Configuration used to direct traffic to firewalls and load balancers, other than PBR, M-LAG, VRRP, static routes.

Forwarding models

No.	Traffic type	Direction	Forwarding path	Traffic simulation	Load	Traffic direction to firewalls/LB
U-4-101	IPv4 known unicast	South to north	Network > DeviceC > DeviceA&B > DeviceD > Server	Tester	Light	N/A
U-6-101	IPv6 known unicast	South to north	Network > DeviceC > DeviceA&B > DeviceD > Server	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	< 500 ms
	Single point of failure restored on M-LAG member links	< 500 ms
	Single point of failure on uplink ECMP links	< 500 ms
	Single point of failure restored on uplink ECMP links	< 500 ms
	Peer link failure	< 500 ms
	Peer link failure restored	< 500 ms
	Keepalive link failure	0 ms
	Keepalive link failure restored	0 ms
	Keepalive link and peer link failure	< 5000 ms
	Keepalive link and peer link restored	< 1000 ms
	Upgrading the devices	< 500 ms (per-device upgrade)
	Expanding the network	N/A
	Replacing hardware	Fixed-port device: < 500 ms Modular device: · Device replacement: < 1000 ms · Switching fabric module replacement: 0 ms · Service module replacement: < 500 ms

Verifying the configuration

Verifying the status of the M-LAG system

Verify that the peer-link interface and the M-LAG interface are 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: BAGG1

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)

BAGG3 1 UP UP -

# Verify that keepalive link is working correctly.

[DeviceA] display m-lag keepalive

Neighbor keepalive link status: Up

Neighbor is alive for: 64765 s 28 ms

Keepalive packet transmission status:

Sent: Successful

Received: Successful

Last received keepalive packet information:

Source IP address: 21.1.1.2

Time: 2021/01/17 17:10:52

Action: Accept

M-LAG keepalive parameters:

Destination IP address: 21.1.1.2

Source IP address: 21.1.1.1

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 settings.

<DeviceA> display m-lag system

System information

Local system number: 1 Peer system number: 2

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

Local system priority: 123 Peer system priority: 123

Local bridge MAC: 3cd4-3ce1-0200 Peer bridge MAC: 3cd4-437d-0300

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 300 -

Consistency-check delay Disabled 150 -

Standalone delay Disabled - -

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: BAGG1/1

State: UP

Cause: -

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

Local Selected ports (index): HGE1/0/3 (27), HGE1/0/4 (32)

Peer Selected ports indexes: 125, 130

M-LAG interface/M-LAG group ID: BAGG3/1

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=0002-0002-0002, Effective=0002-0002-0002

Peer M-LAG interface LACP MAC: Config=0002-0002-0002, Effective=0002-0002-0002

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

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

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

Local Selected ports (index): HGE1/0/1 (12), HGE1/0/2 (13)

Peer Selected ports indexes: 56, 57

Verifying the routing protocols

# Display the OSPF neighbors of Device A.

[DeviceA] 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

4.4.4.4 101.1.1.2 1 36 Full/DR Vlan101

5.5.5.5 32.1.1.2 1 38 Full/DR Vlan32

6.6.6.6 100.1.1.110 1 36 Full/DR Vlan100

# Display the OSPFv3 neighbors of Device A.

[DeviceA] display ospfv3 peer

OSPFv3 Process 1 with Router ID 3.3.3.3

Area: 0.0.0.0

-------------------------------------------------------------------------

Router ID Pri State Dead-Time InstID Interface

4.4.4.4 1 Full/DR 00:00:36 0 Vlan101

5.5.5.5 1 Full/DR 00:00:35 0 Vlan32

6.6.6.6 1 Full/DR 00:00:35 0 Vlan100

# Display the OSPF neighbors of Device B.

[DeviceB] 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

3.3.3.3 101.1.1.1 1 32 Full/BDR Vlan101

5.5.5.5 33.1.1.2 1 33 Full/DR Vlan33

6.6.6.6 100.1.1.110 1 36 Full/DR Vlan100

# Display the OSPFv3 neighbors of Device B.

[DeviceB] display ospfv3 peer

OSPFv3 Process 1 with Router ID 4.4.4.4

Area: 0.0.0.0

-------------------------------------------------------------------------

Router ID Pri State Dead-Time InstID Interface

3.3.3.3 1 Full/BDR 00:00:35 0 Vlan101

5.5.5.5 1 Full/DR 00:00:38 0 Vlan33

6.6.6.6 1 Full/DR 00:00:36 0 Vlan100

# Display the OSPF neighbors of Device C.

[DeviceC] display 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

3.3.3.3 32.1.1.1 1 32 Full/DR Vlan32

4.4.4.4 33.1.1.1 1 38 Full/DR Vlan33

# Display the OSPFv3 neighbors of Device C.

[DeviceC] display ospfv3 peer

OSPFv3 Process 1 with Router ID 5.5.5.5

Area: 0.0.0.0

-------------------------------------------------------------------------

Router ID Pri State Dead-Time InstID Interface

3.3.3.3 1 Full/DR 00:00:37 0 Vlan32

4.4.4.4 1 Full/DR 00:00:34 0 Vlan33

Verifying that Server 1 and Server 2 can communicate with Network

Server 1 and Server 2 can communicate with Network through both IPv4 and IPv6 addresses.

Verifying that Server 1 and Server 2 can still communicate with Network when the uplink interface of Device A or Device B fails

Disconnect the interface connecting Device A to Device C. Server 1 and Server 2 can still communicate with Network (transient packet loss occurs during the traffic switchover process).

Displaying the brief spanning tree status and statistics

<DeviceA> display stp brief

MST ID Port Role STP State Protection

0 Bridge-Aggregation3 (M-LAG) DESI FORWARDING NONE

<DeviceB> display stp brief

MST ID Port Role STP State Protection

0 Bridge-Aggregation3 (M-LAG) DESI FORWARDING NONE

Verifying OSPF and OSPFv3 peer establishment with the M-LAG virtual IP addresses

[DeviceD]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

3.3.3.3 100.1.1.101 1 38 Full/DR Vlan100

4.4.4.4 100.1.1.102 1 33 Full/DROther Vlan100

[DeviceD]display ospfv3 peer

OSPFv3 Process 1 with Router ID 6.6.6.6

Area: 0.0.0.0

-------------------------------------------------------------------------

Router ID Pri State Dead-Time InstID Interface

3.3.3.3 1 Full/DROther 00:00:32 0 Vlan100

4.4.4.4 1 Full/BDR 00:00:34 0 Vlan100

Upgrading the devices

Upgrading the M-LAG member 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

Verify that the traffic interruption time is shorter than 500 ms during a switchover and shorter than 150 ms during fallback when the traffic load is light. For more information, 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.

Expanding the network

An expansion operation adds two leaf devices.

Adding an M-LAG member device

Checking the environment

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

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.

Expanding the network

1. Disconnect the device from network management systems.

2. Upgrade the software of the device as needed.

3. Preconfigure the device.

4. Connect the device to network management systems.

5. Incorporate the device on the controller.

Verifying the traffic interruption time

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

Verifying the expansion result

Execute the following commands to verify that the device is added 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 target 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 a service module

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

2. 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 target 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 a switching fabric module

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."

Replacing a device

Checking the environment

Execute the commands in "Verifying the configuration" and the following commands to verify that the target 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 a device

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-6W100

Configuring the single-homed interface of the M-LAG system

Setting up OSPF and OSPFv3 peer relationships with the M-LAG member devices

Verifying the status of the M-LAG system

Verifying the routing protocols

Verifying that Server 1 and Server 2 can communicate with Network

Verifying that Server 1 and Server 2 can still communicate with Network when the uplink interface of Device A or Device B fails

Displaying the brief spanning tree status and statistics

Verifying OSPF and OSPFv3 peer establishment with the M-LAG virtual IP addresses

Upgrading the devices

Checking the environment

Upgrading the devices

Verifying the traffic interruption time during the upgrade

Verifying the upgrade result

Checking the environment

Expanding the network

Verifying the traffic interruption time

Verifying the expansion result

Replacing a service module

Verifying the traffic interruption time

Verifying the replacement result

Replacing a switching fabric module

Verifying the traffic interruption time

Verifying the replacement result

Replacing a device

Verifying the traffic interruption time

Verifying the replacement result

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