mac-address multicast

Function

The mac-address multicast command configures a static multicast MAC address on an interface.

The undo mac-address multicast command deletes the static MAC address from an interface.

By default, no static multicast MAC address is configured on an interface.

Format

mac-address multicast mac-address vlan vlan-id

undo mac-address multicast mac-address vlan vlan-id

Parameters

Parameter	Description	Value
mac-address	Specifies a multicast MAC address.	The value is in H-H-H format. An H contains 1 to 4 hexadecimal digits.
vlan vlan-id	Specifies the VLAN that the interface belongs to.	The value is an integer that ranges from 1 to 4094.

Views

MultiGE interface view, Ethernet interface view, GE interface view, XGE interface view, 25GE interface view, 40GE interface view, 100GE interface view, port group view, Eth-Trunk interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

By default, the switch broadcasts received multicast packets in a VLAN, wasting network bandwidth and threatens network security. To reduce broadcasting of multicast packets, configure IGMP snooping or MLD snooping on the switch so that the switch can generate Layer 2 multicast forwarding entries. Alternatively, configure static multicast MAC address entries by binding multicast MAC addresses to interfaces.

After a static multicast MAC address is configured on an interface, multicast packets destined for this multicast MAC address are forwarded only to the interface in the specified VLAN.

Prerequisites

The specified VLAN exists and the interfaces have been added to the VLAN.
The switch has been configured to forward multicast data based on MAC addresses using the l2-multicast forwarding-mode mac command.

Precautions

The MAC address specified in the command must be a multicast MAC address with the rightmost bit as 1 (xxxx xxx1).
The VLAN specified in the command cannot be a super-VLAN, leased line VLAN, control VLAN of a Smart Ethernet Protocol (SEP) segment, or control VLAN of a Rapid Ring Protection Protocol (RRPP) ring.
When the static multicast MAC address configured on an interface is an IPv4 multicast MAC address starting with 0x01-00-5e or an IPv6 multicast MAC address starting with 0x3333, Layer 2 multicast snooping cannot be enabled in the VLANs on the interface.
Before configuring static multicast MAC addresses on an interface of the S2720-EI, S5720-LI, S5720S-LI, S6720-LI, S6720S-LI, S5720-SI, S5720I-SI, S5720S-SI, S5730-SI, S5730S-EI, S6720-SI, and S6720S-SI, set the multicast data forwarding mode to MAC address based mode in the VLAN to which the interface belongs.

Example

# Configure static MAC address 0100-2100-2200 on GE0/0/1 in VLAN 10.

<HUAWEI> system-view
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] port link-type trunk
[HUAWEI-GigabitEthernet0/0/1] port trunk allow-pass vlan 10
[HUAWEI-GigabitEthernet0/0/1] mac-address multicast 0100-2100-2200 vlan 10