H3C S12500 Switch Router Series
IGMP Snooping Configuration Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The information in this document is subject to change without notice.

 

Contents

Introduction· 1

Prerequisites· 1

Example: Configuring multicast group policies· 1

Network configuration· 1

Analysis· 2

Software versions used· 2

Restrictions and guidelines· 2

Procedures· 2

Verifying the configuration· 3

Configuration files· 4

Example: Configuring IGMP snooping static ports· 5

Network configuration· 5

Analysis· 6

Software versions used· 6

Restrictions and guidelines· 6

Procedures· 6

Verifying the configuration· 8

Configuration files· 9

Related documentation· 11

Introduction

This document introduces IGMP snooping configuration examples.

Prerequisites

This document is not restricted to specific software or hardware versions.

The configuration examples in this document were created and verified in a lab environment, and all the switches were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

This document assumes that you have basic knowledge of IGMP snooping.

Example: Configuring multicast group policies

Network configuration

As shown in Figure 1:

·     Router A runs IGMP and acts as the IGMP querier.

·     Device A runs IGMP snooping.

Configure multicast group policies on Device A to meet the following requirements:

·     Host A receives only the multicast data addressed to multicast group 224.1.1.1.

·     Host B and Host C receive only the multicast data addressed to multicast group 225.1.1.1.

Figure 1 Network diagram

 

Analysis

To meet the network requirements, you must perform the following tasks:

·     IGMPv2 snooping cannot process IGMPv3 messages. It floods IGMPv3 messages in the VLAN to which the IGMPv3 messages belong. To avoid this problem, specify IGMP snooping version 3 for VLAN 100.

·     To avoid receiver hosts in VLAN 100 from receiving multicast data addressed to other groups, enable dropping unknown multicast data in VLAN 100.

·     To configure multicast group policies, specify a basic ACL and create ACL rules to define the groups that you want the receiver hosts to join.

Software versions used

This configuration example was created and verified on Release 3606.

Restrictions and guidelines

You must globally enable IGMP snooping in system view before you enable IGMP snooping for a VLAN in VLAN view.

You can configure multicast group policies for all ports in IGMP-snooping view or for the current port in interface view. The configuration made in interface view takes priority over the configuration made in IGMP-snooping view.

By default, interfaces on the device are disabled (in ADM or Administratively Down state). To have an interface operate, you must use the undo shutdown command to enable that interface.

In this example, interfaces must operate in Layer 2 mode. By default, physical interfaces on the device are operating at Layer 3 mode. To configure an interface to operate in Layer 2 mode, use the port link-mode command to change the link mode of that interface.

Procedures

1.     Assign an IP address and subnet mask to each interface on the routers in the PIM-DM domain. (Details not shown.)

2.     Configure a unicast routing protocol on the routers in the PIM-DM domain. (Details not shown.)

3.     Enable multicast routing globally on the routers in the PIM-DM domain. (Details not shown.)

4.     Enable PIM-DM for the interfaces through which routers connects with each other on the routers in the PIM-DM domain. (Details not shown.)

5.     Configure Router A:

# Enable IP multicast routing globally.

<RouterA> system-view

[RouterA] multicast routing

[RouterA-mrib] quit

# Enable IGMPv3 on HundredGigE 1/0/1.

[RouterA] interface hundredgige 1/0/1

[RouterA-HundredGigE1/0/1] igmp enable

[RouterA-HundredGigE1/0/1] igmp version 3

[RouterA-HundredGigE1/0/1] quit

6.     Configure Device A:

# Enable IGMP snooping globally.

<DeviceA> system-view

[DeviceA] igmp-snooping

[DeviceA-igmp-snooping] quit

# Create VLAN 100, and assign HundredGigE 1/0/1 through HundredGigE 1/0/4 to VLAN 100.

[DeviceA] vlan 100

[DeviceA-vlan100] port hundredgige 1/0/1 to hundredgige 1/0/4

# Enable IGMPv3 snooping and enable dropping unknown multicast data for VLAN 100.

[DeviceA-vlan100] igmp-snooping enable

[DeviceA-vlan100] igmp-snooping version 3

[DeviceA-vlan100] igmp-snooping drop-unknown

[DeviceA-vlan100] quit

# Configure a multicast group policy for VLAN 100 on HundredGigE 1/0/2 so that Host A can join only multicast group 224.1.1.1.

[DeviceA] acl basic 2000

[DeviceA-acl-ipv4-basic-2000] rule permit source 224.1.1.1 0

[DeviceA-acl-ipv4-basic-2000] quit

[DeviceA] interface hundredgige 1/0/2

[DeviceA-HundredGigE1/0/2] igmp-snooping group-policy 2000 vlan 100

[DeviceA-HundredGigE1/0/2] quit

# Configure a multicast group policy globally for VLAN 100 so that Host B and Host C can join only multicast group 225.1.1.1.

[DeviceA] acl basic 2001

[DeviceA-acl-ipv4-basic-2001] rule permit source 225.1.1.1 0

[DeviceA-acl-ipv4-basic-2001] quit

[DeviceA] igmp-snooping

[DeviceA-igmp-snooping] group-policy 2001 vlan 100

[DeviceA-igmp-snooping] quit

Verifying the configuration

# Send IGMP reports from Host A, Host B, and Host C to join multicast groups 224.1.1.1, 224.2.2.2, and 225.1.1.1. (Details not shown.)

# Send multicast data from the source to the multicast groups. (Details not shown.)

# Display dynamic IGMP snooping group entries for VLAN 100 on Device A.

[DeviceA] display igmp-snooping group vlan 100

Total 2 entries.

 

VLAN 100: Total 2 entries.

  (0.0.0.0, 224.1.1.1)

    Host ports (1 in total):

      HGE1/0/2                                     (00:03:09)

  (0.0.0.0, 225.1.1.1)

    Host ports (2 in total):

      HGE1/0/3                                     (00:04:04)

      HGE1/0/4                                     (00:02:38)

The output shows the following information:

·     Host A has joined multicast group 224.1.1.1 through HundredGigE 1/0/2, and it has not joined multicast groups 224.2.2.2 and 225.1.1.1.

·     Host B and Host C have joined multicast group 225.1.1.1 through HundredGigE 1/0/3 and HundredGigE 1/0/4, respectively. They have not joined multicast groups 224.1.1.1 and 224.2.2.2.

·     Multicast group policies have taken effect.

Configuration files

·     Router A:

#

interface HundredGigE1/0/1

 port link-mode route

 ip address 10.1.1.1 255.255.255.0

 igmp enable

 igmp version 3

#

multicast routing

#

·     Device A:

#

igmp-snooping

 group-policy 2001 vlan 100

#

vlan 100

 igmp-snooping enable

 igmp-snooping drop-unknown

 igmp-snooping version 3

#

interface HundredGigE1/0/1

 port link-mode bridge

 port access vlan 100

#

interface HundredGigE1/0/2

 port link-mode bridge

 port access vlan 100

 igmp-snooping group-policy 2000 vlan 100

#

interface HundredGigE1/0/3

 port link-mode bridge

 port access vlan 100

#

interface HundredGigE1/0/4

 port link-mode bridge

 port access vlan 100

#

acl basic 2000

 rule 0 permit source 224.1.1.1 0

#

acl basic 2001

 rule 0 permit source 225.1.1.1 0

#

Example: Configuring IGMP snooping static ports

Network configuration

As shown in Figure 2:

·     All devices in VLAN 100 run IGMP snooping.

·     Router A runs IGMPv2 and acts as the IGMP querier.

·     STP runs in VLAN 100. The direct route between Device A and Device B or the route from Device A to Device B with Device C as the intermediate device is blocked to avoid loops.

Configure IGMP snooping static ports to meet the following requirements:

·     Multicast data uninterruptedly flows to the receiver hosts after a link switchover occurs between Device A and Device B.

·     Host A, Host B, and Host C permanently receive the multicast data addressed to multicast group 224.1.1.1.

Figure 2 Network diagram

 

Analysis

To meet the network requirements, you must perform the following tasks:

·     By default, when a link switchover occurs, multicast data can flow along the new link after a minimum of one IGMP query-response cycle. Multicast delivery is interrupted during this process.

Configure HundredGigE 1/0/2 and HundredGigE 1/0/3 on Device A, HundredGigE 1/0/4 on Device B, and HundredGigE 1/0/2 on Device C as static router ports. Then, multicast data will be forwarded to these ports.

·     Configure HundredGigE 1/0/2 and HundredGigE 1/0/3 on Device B, and HundredGigE 1/0/3 on Device C as static member ports of multicast group 224.1.1.1. Then, multicast data for the group will always be forwarded out of these ports, and Host A, Host B, and Host C can always receive the data.

Software versions used

This configuration example was created and verified on Release 3606.

Restrictions and guidelines

When you configure IGMP snooping static ports, you must globally enable IGMP snooping in system view before you enable IGMP snooping for a VLAN in VLAN view.

By default, interfaces on the device are disabled (in ADM or Administratively Down state). To have an interface operate, you must use the undo shutdown command to enable that interface.

In this example, interfaces must operate in Layer 2 mode. By default, physical interfaces on the device are operating at Layer 3 mode. To configure an interface to operate in Layer 2 mode, use the port link-mode command to change the link mode of that interface.

Procedures

1.     Assign an IP address and subnet mask to each interface on the routers in the PIM-DM domain. (Details not shown.)

2.     Configure OSPF on the routers in the PIM-DM domain. (Details not shown.)

3.     Enable multicast routing globally on the routers in the PIM-DM domain. (Details not shown.)

4.     Enable PIM-DM for the interfaces through which routers connects with each other in the PIM-DM domain. (Details not shown.)

5.     Configure Router A:

# Enable IP multicast routing.

<RouterA> system-view

[RouterA] multicast routing

[RouterA-mrib] quit

# Enable IGMP on HundredGigE 1/0/1.

[RouterA] interface hundredgige 1/0/1

[RouterA-HundredGigE1/0/1] igmp enable

[RouterA-HundredGigE1/0/1] quit

6.     Configure Device A:

# Enable IGMP snooping globally.

<DeviceA> system-view

[DeviceA] igmp-snooping

[DeviceA-igmp-snooping] quit

# Create VLAN 100, assign HundredGigE 1/0/1 through HundredGigE 1/0/3 to this VLAN, and enable IGMP snooping for this VLAN.

[DeviceA] vlan 100

[DeviceA-vlan100] port hundredgige 1/0/1 to hundredgige 1/0/3

[DeviceA-vlan100] igmp-snooping enable

[DeviceA-vlan100] quit

# Configure HundredGigE 1/0/2 and HundredGigE 1/0/3 as static router ports.

[DeviceA] interface hundredgige 1/0/2

[DeviceA-HundredGigE1/0/2] igmp-snooping static-router-port vlan 100

[DeviceA-HundredGigE1/0/2] quit

[DeviceA] interface hundredgige 1/0/3

[DeviceA-HundredGigE1/0/3] igmp-snooping static-router-port vlan 100

[DeviceA-HundredGigE1/0/3] quit

7.     Configure Device B:

# Enable IGMP snooping globally.

<DeviceB> system-view

[DeviceB] igmp-snooping

[DeviceB-igmp-snooping] quit

# Create VLAN 100, assign HundredGigE 1/0/1 and HundredGigE 1/0/4 to this VLAN, and enable IGMP snooping for this VLAN.

[DeviceB] vlan 100

[DeviceB-vlan100] port hundredgige 1/0/1 hundredgige 1/0/4

[DeviceB-vlan100] igmp-snooping enable

[DeviceB-vlan100] quit

# Configure HundredGigE 1/0/4 as a static router port.

[DeviceB] interface hundredgige 1/0/4

[DeviceB-HundredGigE1/0/4] igmp-snooping static-router-port vlan 100

[DeviceB-HundredGigE1/0/4] quit

# Configure HundredGigE 1/0/2 and HundredGigE 1/0/3 as static member ports for multicast group 224.1.1.1 in VLAN 100.

[DeviceB] interface hundredgige 1/0/2

[DeviceB-HundredGigE1/0/2] igmp-snooping static-group 224.1.1.1 vlan 100

[DeviceB-HundredGigE1/0/2] quit

[DeviceB] interface hundredgige 1/0/3

[DeviceB-HundredGigE1/0/3] igmp-snooping static-group 224.1.1.1 vlan 100

[DeviceB-HundredGigE1/0/3] quit

8.     Configure Device C:

# Enable IGMP snooping globally.

<DeviceC> system-view

[DeviceC] igmp-snooping

[DeviceC-igmp-snooping] quit

# Create VLAN 100, assign HundredGigE 1/0/1 through HundredGigE 1/0/4 to this VLAN, and enable IGMP snooping for this VLAN.

[DeviceC] vlan 100

[DeviceC-vlan100] port hundredgige 1/0/1 to hundredgige 1/0/4

[DeviceC-vlan100] igmp-snooping enable

[DeviceC-vlan100] quit

# Configure HundredGigE 1/0/2 as a static router port in VLAN 100.

[DeviceC] interface hundredgige 1/0/2

[DeviceC-HundredGigE1/0/2] igmp-snooping static-router-port vlan 100

[DeviceC-HundredGigE1/0/2] quit

# Configure HundredGigE 1/0/3 as a static member port of multicast group 224.1.1.1 in VLAN 100.

[DeviceC] interface hundredgige 1/0/3

[DeviceC-HundredGigE1/0/3] igmp-snooping static-group 224.1.1.1 vlan 100

[DeviceC-HundredGigE1/0/3] quit

Verifying the configuration

Verify the configuration before hosts join any multicast groups.

# Display static router port information for VLAN 100 on Device A.

[DeviceA] display igmp-snooping static-router-port vlan 100

VLAN 100:

  Router ports (2 in total):

    HGE1/0/2

    HGE1/0/3

The output shows that HundredGigE 1/0/2 and HundredGigE 1/0/3 on Device A have become static router ports in VLAN 100.

# Display static router port information for VLAN 100 on Device B.

[DeviceB] display igmp-snooping static-router-port vlan 100

VLAN 100:

  Router ports (1 in total):

    HGE1/0/4

The output shows that HundredGigE 1/0/4 on Device B has become a static router port in VLAN 100.

# Display static IGMP snooping group entries for VLAN 100 on Device B.

[DeviceB] display igmp-snooping static-group vlan 100

Total 1 entries.

 

VLAN 100: Total 1 entries.

  (0.0.0.0, 224.1.1.1)

    Host ports (2 in total):

      HGE1/0/2

      HGE1/0/3

The output shows that HundredGigE 1/0/2 and HundredGigE 1/0/3 on Device B have become static member ports of multicast group 224.1.1.1 in VLAN 100.

# Display static router port information for VLAN 100 on Device C.

[DeviceC] display igmp-snooping static-router-port vlan 100

VLAN 100:

  Router ports (1 in total):

    HGE1/0/2

The output shows that HundredGigE 1/0/2 on Device C has become a static router port in VLAN 100.

# Display static IGMP snooping group entries for VLAN 100 on Device C.

[DeviceC] display igmp-snooping static-group vlan 100

Total 1 entries.

 

VLAN 100: Total 1 entries.

  (0.0.0.0, 224.1.1.1)

    Host ports (1 in total):

      HGE1/0/3

The output shows that HundredGigE 1/0/3 on Device C has become a static group member of multicast group 224.1.1.1.

Configuration files

·     Router A:

#

interface HundredGigE1/0/1

 port link-mode route

 ip address 10.1.1.1 255.255.255.0

 igmp enable

#

multicast routing

#

·     Device A:

#

igmp-snooping

#

vlan 100

 igmp-snooping enable

#

interface HundredGigE1/0/1

 port link-mode bridge

 port access vlan 100

#

interface HundredGigE1/0/2

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-router-port vlan 100

#

interface HundredGigE1/0/3

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-router-port vlan 100

#

·     Device B:

igmp-snooping

#

vlan 100

 igmp-snooping enable

#

interface HundredGigE1/0/1

 port link-mode bridge

 port access vlan 100

#

interface HundredGigE1/0/2

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-group 224.1.1.1 vlan 100

#

interface HundredGigE1/0/3

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-group 224.1.1.1 vlan 100

#

interface HundredGigE1/0/4

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-router-port vlan 100

#

·     Device C:

#

igmp-snooping

#

vlan 100

 igmp-snooping enable

#

interface HundredGigE1/0/1

 port link-mode bridge

 port access vlan 100

#

interface HundredGigE1/0/2

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-router-port vlan 100

#

interface HundredGigE1/0/3

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-group 224.1.1.1 vlan 100

#

interface HundredGigE1/0/4

 port link-mode bridge

 port access vlan 100

#

Related documentation

·     H3C S12500R Switch Router Series IP Multicast Command Reference-R3606

·     H3C S12500R Switch Router Series IP Multicast Configuration Guide-R3606