Contents

Introduction· 1

Prerequisites· 1

Example: Configuring static multicast MAC address entries· 1

Network configuration· 1

Analysis· 1

Applicable hardware and software versions· 2

Restrictions and guidelines· 2

Procedures· 2

Verifying the configuration· 2

Configuration files· 3

Introduction

This document provides configuration examples of static multicast MAC address entries.

Prerequisites

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 multicast MAC addresses.

Example: Configuring static multicast MAC address entries

Network configuration

As shown in Figure 1, Router A runs IGMP and acts as the IGMP querier. Switch A does not run a Layer 2 multicast protocol.

Configure a static multicast MAC address entry on Switch A so that only Host A and Host C can receive multicast data for multicast group 224.1.1.1.

Figure 1 Network diagram

Analysis

Multicast MAC address entries guide Layer 2 multicast forwarding. They can be dynamically created through Layer 2 multicast protocols or manually configured by binding multicast MAC addresses and ports.

In this example, Switch A does not run a Layer 2 multicast protocol. To control destination ports of Layer 2 multicast data, configure a static multicast MAC address entry on Switch A.

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Restrictions and guidelines

When you configure multicast MAC address entries, follow these guidelines:

·     You must specify an unused multicast MAC address in a manually configured multicast MAC address entry.

·     By default, Ethernet interfaces, VLAN interfaces, and aggregate interfaces are shut down. You must first use the undo shutdown command to bring them up. This example assumes that all these interfaces are already up.

Procedures

# On Switch A, create VLAN 100.

<SwitchA> system-view

[SwitchA] vlan 100

[SwitchA-vlan100] quit

# Configure Ten-GigabitEthernet 3/0/1 through Ten-GigabitEthernet 3/0/4 to operate in Layer 2 mode, and assign the ports to VLAN 100.

[SwitchA] interface range ten-gigabitethernet 3/0/1 to ten-gigabitethernet 3/0/4

[SwitchA-if-range] port access vlan 100

[SwitchA-if-range] quit

# Translate the multicast IP address 224.1.1.1 to a multicast MAC address (0100-5e01-0101). (Details not shown.)

# Create a static entry for the multicast MAC address 0100-5e01-0101 with Ten-GigabitEthernet 3/0/2 and Ten-GigabitEthernet 3/0/4 in VLAN 100 as outgoing ports.

[SwitchA] mac-address multicast 0100-5e01-0101 interface ten-gigabitethernet 3/0/2 ten-gigabitethernet 3/0/4 vlan 100

Verifying the configuration

# Display static multicast MAC address entries for VLAN 100 on Switch A.

[SwitchA] display mac-address multicast vlan 100

MAC Address      VLAN ID    State            Port/NickName            Aging

0100-5e01-0101   100        Multicast        XGE3/0/2                 N

                                             XGE3/0/4

The output shows that Ten-GigabitEthernet 3/0/2 and Ten-GigabitEthernet 3/0/4 have become outgoing ports of the multicast MAC group 0100-5e01-0101.

Configuration files

#

vlan 100

#

interface Ten-GigabitEthernet3/0/1

 port link-mode bridge

 port access vlan 100

#

interface Ten-GigabitEthernet3/0/2

 port link-mode bridge

 port access vlan 100

#

interface Ten-GigabitEthernet3/0/3

 port link-mode bridge

 port access vlan 100

#

interface Ten-GigabitEthernet3/0/4

 port link-mode bridge

 port access vlan 100

#

mac-address multicast 0100-5e01-0101 interface Ten-GigabitEthernet3/0/2 Ten-GigabitEthernet3/0/4 vlan 100

#