06-IP Multicast Configuration Examples

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02-H3C_IGMP_Snooping_Configuration_Examples
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H3C IGMP Snooping

Configuration Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Software version: Release 7577P04

Document version: 6W100-20190330

 

Copyright © 2019 New H3C Technologies Co., Ltd. All rights reserved.

No part of this manual may be reproduced or transmitted in any form or by any means without prior written consent of New H3C Technologies Co., Ltd.

Except for the trademarks of New H3C Technologies Co., Ltd., any trademarks that may be mentioned in this document are the property of their respective owners.

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



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 devices 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.

·          Switch A runs IGMP snooping.

Configure multicast group policies on Switch 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 prevent hosts in VLAN 100 from receiving multicast data addressed to other groups, enable dropping unknown multicast data in VLAN 100.

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

Restrictions and guidelines

When you configure multicast group polices, follow these 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.

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 that connect 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 Ten-GigabitEthernet 1/0/1.

[RouterA] interface ten-gigabitethernet 1/0/1

[RouterA-Ten-GigabitEthernet1/0/1] igmp enable

[RouterA-Ten-GigabitEthernet1/0/1] igmp version 3

[RouterA-Ten-GigabitEthernet1/0/1] quit

6.        Configure Switch A:

# Enable IGMP snooping globally.

<SwitchA> system-view

[SwitchA] igmp-snooping

[SwitchA-igmp-snooping] quit

# Create VLAN 100, and assign Ten-GigabitEthernet 1/0/1 through Ten-GigabitEthernet 1/0/4 to VLAN 100.

[SwitchA] vlan 100

[SwitchA-vlan100] port ten-gigabitethernet 1/0/1 to ten-gigabitethernet 1/0/4

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

[SwitchA-vlan100] igmp-snooping enable

[SwitchA-vlan100] igmp-snooping version 3

[SwitchA-vlan100] igmp-snooping drop-unknown

[SwitchA-vlan100] quit

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

[SwitchA] acl basic 2000

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

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

[SwitchA] interface ten-gigabitethernet 1/0/2

[SwitchA-Ten-GigabitEthernet1/0/2] igmp-snooping group-policy 2000 vlan 100

[SwitchA-Ten-GigabitEthernet1/0/2] 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.

[SwitchA] acl basic 2001

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

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

[SwitchA] igmp-snooping

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

[SwitchA-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 three groups. (Details not shown.)

# Display dynamic IGMP snooping forwarding entries for VLAN 100 on Switch A.

[SwitchA] display igmp-snooping group vlan 100

Total 2 entries.

 

VLAN 100: Total 2 entries.

  (0.0.0.0, 224.1.1.1)

    Host slots (1 in total):

      3

    Host ports (1 in total):

      XGE1/0/2

  (0.0.0.0, 225.1.1.1)

    Host slots (1 in total):

      3

    Host ports (2 in total):

      XGE1/0/3

      XGE1/0/4

The output shows the following information:

·          Host A has joined multicast group 224.1.1.1 through Ten-GigabitEthernet 1/0/2, and it does not join 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 Ten-GigabitEthernet 1/0/3 and Ten-GigabitEthernet 1/0/4, respectively. They do not join multicast groups 224.1.1.1 and 224.2.2.2.

Multicast group policies have taken effect.

Configuration files

·          Router A:

#

interface Ten-GigabitEthernet1/0/1

 port link-mode route

 ip address 10.1.1.1 255.255.255.0

 igmp enable

 igmp version 3

#

multicast routing

#

·          Switch A:

#

igmp-snooping

 group-policy 2001 vlan 100

#

vlan 100

 igmp-snooping enable

 igmp-snooping drop-unknown

 igmp-snooping version 3

#

interface Ten-GigabitEthernet1/0/1

 port link-mode bridge

 port access vlan 100

#

interface Ten-GigabitEthernet1/0/2

 port link-mode bridge

 port access vlan 100

 igmp-snooping group-policy 2000 vlan 100

#

interface Ten-GigabitEthernet1/0/3

 port link-mode bridge

 port access vlan 100

#

interface Ten-GigabitEthernet1/0/4

 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 static ports

Network configuration

As shown in Figure 2:

·          All switches in VLAN 100 run IGMP snooping.

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

·          STP runs in VLAN 100. The path from Switch A to Switch B 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 Switch A and Switch 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 Ten-GigabitEthernet 1/0/2 and Ten-GigabitEthernet 1/0/3 on Switch A, Ten-GigabitEthernet 1/0/4 on Switch B, and Ten-GigabitEthernet 1/0/2 on Switch C as static router ports. Then, multicast data will be forwarded to these ports.

·          Configure Ten-GigabitEthernet 1/0/2 and Ten-GigabitEthernet 1/0/3 on Switch B, and Ten-GigabitEthernet 1/0/3 on Switch 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.

Restrictions and guidelines

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

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 that connect the routers 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 Ten-GigabitEthernet 1/0/1.

[RouterA] interface ten-gigabitethernet 1/0/1

[RouterA-Ten-GigabitEthernet1/0/1] igmp enable

[RouterA-Ten-GigabitEthernet1/0/1] quit

6.        Configure Switch A:

# Enable IGMP snooping globally.

<SwitchA> system-view

[SwitchA] igmp-snooping

[SwitchA-igmp-snooping] quit

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

[SwitchA] vlan 100

[SwitchA-vlan100] port ten-gigabitethernet 1/0/1 to ten-gigabitethernet 1/0/3

[SwitchA-vlan100] igmp-snooping enable

[SwitchA-vlan100] quit

# Configure Ten-GigabitEthernet 1/0/2 and Ten-GigabitEthernet 1/0/3 as static router ports.

[SwitchA] interface ten-gigabitethernet 1/0/2

[SwitchA-Ten-GigabitEthernet1/0/2] igmp-snooping static-router-port vlan 100

[SwitchA-Ten-GigabitEthernet1/0/2] quit

[SwitchA] interface Ten-GigabitEthernet 1/0/3

[SwitchA-Ten-GigabitEthernet1/0/3] igmp-snooping static-router-port vlan 100

[SwitchA-Ten-GigabitEthernet1/0/3] quit

7.        Configure Switch B:

# Enable IGMP snooping globally.

<SwitchB> system-view

[SwitchB] igmp-snooping

[SwitchB-igmp-snooping] quit

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

[SwitchB] vlan 100

[SwitchB-vlan100] port ten-gigabitethernet 1/0/1 ten-gigabitethernet 1/0/4

[SwitchB-vlan100] igmp-snooping enable

[SwitchB-vlan100] quit

# Configure Ten-GigabitEthernet 1/0/4 as a static router port.

[SwitchB] interface ten-gigabitethernet 1/0/4

[SwitchB-Ten-GigabitEthernet1/0/4] igmp-snooping static-router-port vlan 100

[SwitchB-Ten-GigabitEthernet1/0/4] quit

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

[SwitchB] interface ten-gigabitethernet 1/0/2

[SwitchB-Ten-GigabitEthernet1/0/2] igmp-snooping static-group 224.1.1.1 vlan 100

[SwitchB-Ten-GigabitEthernet1/0/2] quit

[SwitchB] interface ten-gigabitethernet 1/0/3

[SwitchB-Ten-GigabitEthernet1/0/3] igmp-snooping static-group 224.1.1.1 vlan 100

[SwitchB-Ten-GigabitEthernet1/0/3] quit

8.        Configure Switch C:

# Enable IGMP snooping globally.

<SwitchC> system-view

[SwitchC] igmp-snooping

[SwitchC-igmp-snooping] quit

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

[SwitchC] vlan 100

[SwitchC-vlan100] port ten-gigabitethernet 1/0/1 to ten-gigabitethernet 1/0/4

[SwitchC-vlan100] igmp-snooping enable

[SwitchC-vlan100] quit

# Configure Ten-GigabitEthernet 1/0/2 as a static router port in VLAN 100.

[SwitchC] interface ten-gigabitethernet 1/0/2

[SwitchC-Ten-GigabitEthernet1/0/2] igmp-snooping static-router-port vlan 100

[SwitchC-Ten-GigabitEthernet1/0/2] quit

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

[SwitchC] interface ten-gigabitethernet 1/0/3

[SwitchC-Ten-GigabitEthernet1/0/3] igmp-snooping static-group 224.1.1.1 vlan 100

[SwitchC-Ten-GigabitEthernet1/0/3] quit

Verifying the configuration

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

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

VLAN 100:

  Router slots (1 in total):

    3

  Router ports (2 in total):

    XGE1/0/2

    XGE1/0/3

The output shows that Ten-GigabitEthernet 1/0/2 and Ten-GigabitEthernet 1/0/3 on Switch A have become static router ports in VLAN 100.

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

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

VLAN 100:

  Router slots (1 in total):

    3

  Router ports (1 in total):

   XGE1/0/4

The output shows that Ten-GigabitEthernet 1/0/4 on Switch B has become a static router port in VLAN 100.

# Display static IGMP snooping forwarding entries for VLAN 100 on Switch B.

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

Total 1 entries.

 

VLAN 100: Total 1 entries.

  (0.0.0.0, 224.1.1.1)

    Host slots (1 in total):

      3

    Host ports (2 in total):

      XGE1/0/2

      XGE1/0/3

The output shows that Ten-GigabitEthernet 1/0/2 and Ten-GigabitEthernet 1/0/3 on Switch 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 Switch C.

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

VLAN 100:

  Router slots (1 in total):

    3

  Router ports (1 in total):

    XGE1/0/2

The output shows that Ten-GigabitEthernet 1/0/2 on Switch C has become a static router port in VLAN 100.

# Display static IGMP snooping forwarding entries for VLAN 100 on Switch C.

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

Total 1 entries.

 

VLAN 100: Total 1 entries.

  (0.0.0.0, 224.1.1.1)

    Host slots (1 in total):

      3

    Host ports (1 in total):

      XGE1/0/3

The output shows that Ten-GigabitEthernet 1/0/3 on Switch C has become a static group member of multicast group 224.1.1.1.

Configuration files

·          Router A:

#

interface Ten-GigabitEthernet1/0/1

 port link-mode route

 ip address 10.1.1.1 255.255.255.0

 igmp enable

 igmp version 3

#

multicast routing

#

·          Switch A:

#

igmp-snooping

#

vlan 100

 igmp-snooping enable

#

interface Ten-GigabitEthernet1/0/1

 port link-mode bridge

 port access vlan 100

#

interface Ten-GigabitEthernet1/0/2

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-router-port vlan 100

#

interface Ten-GigabitEthernet1/0/3

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-router-port vlan 100

#

·          Switch B:

#

igmp-snooping

#

vlan 100

 igmp-snooping enable

#

interface Ten-GigabitEthernet1/0/1

 port link-mode bridge

 port access vlan 100

#

interface Ten-GigabitEthernet1/0/2

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-group 224.1.1.1 vlan 100

#

interface Ten-GigabitEthernet1/0/3

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-group 224.1.1.1 vlan 100

#

interface Ten-GigabitEthernet1/0/4

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-router-port vlan 100

#

·          Switch C:

#

igmp-snooping

#

vlan 100

 igmp-snooping enable

#

interface Ten-GigabitEthernet1/0/1

 port link-mode bridge

 port access vlan 100

#

interface Ten-GigabitEthernet1/0/2

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-router-port vlan 100

#

interface Ten-GigabitEthernet1/0/3

 port link-mode bridge

 port access vlan 100

 igmp-snooping static-group 224.1.1.1 vlan 100

#

interface Ten-GigabitEthernet1/0/4

 port link-mode bridge

 port access vlan 100

#

Related documentation

·          H3C S7500E Switch Series IP Multicast Command Reference-R757X

·          H3C S7500E Switch Series IP Multicast Configuration Guide-R757X