06-IP Multicast Configuration Examples

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H3C MLD Snooping

Configuration Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Software version: Release 7595

Document version: 6W100-20201031

 

Copyright © 2020 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 MLD 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 MLD snooping.

Example: Configuring IPv6 multicast group policies

Network configuration

As shown in Figure 1:

·     Router A runs MLDv1 and acts as the MLD querier in VLAN 100.

·     Switch A runs MLDv1 snooping.

Configure an IPv6 multicast group policy on Switch A so that Host A and Host B receive only the IPv6 multicast data addressed to IPv6 multicast group FF1E::101.

Figure 1 Network diagram

 

Analysis

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

·     To prevent hosts in VLAN 100 from receiving IPv6 multicast data addressed to other groups, enable dropping unknown IPv6 multicast data in VLAN 100.

·     To configure an IPv6 multicast group policy, specify an IPv6 basic ACL and create ACL rules to define the groups you want the hosts to join.

Restrictions and guidelines

When you configure IPv6 multicast group polices, follow these restrictions and guidelines:

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

·     An IPv6 multicast group policy denies all IPv6 multicast groups if the specified ACL does not exist or the ACL does not have rules.

Procedures

1.     Assign an IPv6 address and prefix length to each interface on the routers in the IPv6 PIM-DM domain. (Details not shown.)

2.     Configure an IPv6 unicast routing protocol on the routers in the IPv6 PIM-DM domain. (Details not shown.)

3.     Enable IPv6 multicast routing globally on the routers in the IPv6 PIM-DM domain. (Details not shown.)

4.     Enable IPv6 PIM-DM for the interfaces that connect the routers in the IPv6 PIM-DM domain. (Details not shown.)

5.     Configure Switch A:

# Enable MLD snooping globally.

<SwitchA> system-view

[SwitchA] mld-snooping

[SwitchA-mld-snooping] quit

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

[SwitchA] vlan 100

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

# Enable MLD snooping and dropping unknown IPv6 multicast data for VLAN 100.

[SwitchA-vlan100] mld-snooping enable

[SwitchA-vlan100] mld-snooping drop-unknown

[SwitchA-vlan100] quit

# Configure an IPv6 multicast group policy for VLAN 100 so that hosts in this VLAN can join only IPv6 multicast group FF1E::101.

[SwitchA] acl ipv6 basic 2001

[SwitchA-acl-ipv6-basic-2001] rule permit source ff1e::101 128

[SwitchA-acl-ipv6-basic-2001] quit

[SwitchA] mld-snooping

[SwitchA–mld-snooping] group-policy 2001 vlan 100

[SwitchA–mld-snooping] quit

Verifying the configuration

# Send MLD reports from Host A and Host B to join IPv6 multicast groups FF1E::101 and FF1E::202. (Details not shown.)

# Send IPv6 multicast data from the IPv6 multicast source to IPv6 multicast groups FF1E::101 and FF1E::202. (Details not shown.)

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

[SwitchA] display mld-snooping group vlan 100

Total 1 entries.

 

VLAN 100: Total 1 entries.

  (::, FF1E::101)

    Host slots (1 in total):

      3

    Host ports (2 in total):

      XGE1/0/3         (00:03:23)

      XGE1/0/4         (00:04:10)

The output shows that Host A and Host B have joined IPv6 multicast group FF1E::101 through the member ports Ten-GigabitEthernet 1/0/4 and Ten-GigabitEthernet 1/0/3, respectively. Host A and Host B do not join IPv6 multicast group FF1E::202. The IPv6 multicast group policy has taken effect.

Configuration files

#

acl ipv6 basic 2001

 rule 0 permit source FF1E::101/128

#

mld-snooping

 group-policy 2001 vlan 100

#

vlan 100

 mld-snooping enable

 mld-snooping drop-unknown

#

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

#

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

#

Example: Configuring IPv6 static ports

Network configuration

As shown in Figure 2:

·     All switches in VLAN 100 run MLD snooping.

·     Router A runs MLDv1 and acts as the MLD querier.

·     STP runs in VLAN 100. The path from Switch A to Switch B is blocked to avoid loops.

Configure MLD snooping static ports to meet the following requirements:

·     IPv6 multicast data uninterruptedly flows to Host A and Host B after a link switchover occurs between Switch A and Switch B.

·     Host A and Host B permanently receive the IPv6 multicast data addressed to IPv6 multicast group FF1E::101.

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 MLD 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 and Ten-GigabitEthernet 1/0/2 on Switch C as static router ports. Then, IPv6 multicast data will always be forwarded to these ports, and multicast delivery is uninterrupted.

·     Configure Ten-GigabitEthernet 1/0/2 and Ten-GigabitEthernet 1/0/3 on Switch B as static member ports of IPv6 multicast group FF1E::101. Then, IPv6 multicast data for the group will always be forwarded out of these ports, and Host A and Host B can always receiver the data.

Restrictions and guidelines

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

Procedures

1.     Assign an IPv6 address and prefix length to each interface on the routers in the IPv6 PIM-DM domain. (Details not shown.)

2.     Configure an IPv6 unicast routing protocol on the routers in the IPv6 PIM-DM domain. (Details not shown.)

3.     Enable IPv6 multicast routing globally on the routers in the IPv6 PIM-DM domain. (Details not shown.)

4.     Enable IPv6 PIM-DM for the interfaces that connect the routers in the IPv6 PIM-DM domain. (Details not shown.)

5.     Configure Switch A:

# Enable MLD snooping globally.

<SwitchA> system-view

[SwitchA] mld-snooping

[SwitchA-mld-snooping] quit

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

[SwitchA] vlan 100

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

[SwitchA-vlan100] mld-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] mld-snooping static-router-port vlan 100

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

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

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

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

6.     Configure Switch B:

# Enable MLD snooping globally.

<SwitchB> system-view

[SwitchB] mld-snooping

[SwitchB-mld-snooping] quit

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

[SwitchB] vlan 100

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

[SwitchB-vlan100] mld-snooping enable

[SwitchB-vlan100] quit

# Configure Ten-GigabitEthernet 1/0/2 and Ten-GigabitEthernet 1/0/3 as static member ports for IPv6 multicast group FF1E::101 in VLAN 100.

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

[SwitchB-Ten-GigabitEthernet1/0/2] mld-snooping static-group ff1e::101 vlan 100

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

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

[SwitchB-Ten-GigabitEthernet1/0/3] mld-snooping static-group ff1e::101 vlan 100

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

7.     Configure Switch C:

# Enable MLD snooping globally.

<SwitchC> system-view

[SwitchC] mld-snooping

[SwitchC-mld-snooping] quit

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

[SwitchC] vlan 100

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

[SwitchC-vlan100] mld-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] mld-snooping static-router-port vlan 100

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

Verifying the configuration

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

[SwitchA] display mld-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 information about static MLD snooping forwarding entries for VLAN 100 on Switch B.

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

Total 1 entries.

 

VLAN 100: Total 1 entries.

  (::, FF1E::101)

    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 IPv6 multicast group FF1E::101 in VLAN 100.

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

[SwitchC] display mld-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.

Configuration files

·     Switch A:

#

mld-snooping

#

vlan 100

 mld-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

 mld-snooping static-router-port vlan 100

#

interface Ten-GigabitEthernet1/0/3

 port link-mode bridge

 port access vlan 100

 mld-snooping static-router-port vlan 100

#

interface Ten-GigabitEthernet1/0/4

 port link-mode bridge

 port access vlan 100

#

·     Switch B:

#

mld-snooping

#

vlan 100

 mld-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

 mld-snooping static-group FF1E::101 vlan 100

#

interface Ten-GigabitEthernet1/0/3

 port link-mode bridge

 port access vlan 100

 mld-snooping static-group FF1E::101 vlan 100

#

interface Ten-GigabitEthernet1/0/4

 port link-mode bridge

 port access vlan 100

#

·     Switch C:

#

mld-snooping

#

vlan 100

 mld-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

 mld-snooping static-router-port 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

#

Related documentation

·     H3C S7500X Switch Series IP Multicast Command Reference-R759X

·     H3C S7500X Switch Series IP Multicast Configuration Guide-R759X