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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Configuration Notes

Configuration Notes

This section describes notes on configuring static multicast MAC addresses.

Note the following when configuring static multicast MAC addresses on the switch modules:

  • Because static multicast MAC address is a Layer 2 multicast feature, all the static multicast MAC address configurations on interfaces mentioned in this chapter are performed on Layer 2 physical interfaces, including Eth-Trunk interfaces.
  • The MAC address specified in the command must be a multicast MAC address with the leftmost bit as 1 (xxxx xxx1). MAC addresses starting with 0x01 are recommended.
  • The VLAN specified in the command cannot be a super-VLAN.

    If the switch modules uses MAC address based multicast forwarding mode, static groups configured on an interface using the igmp snooping static-group command implement the same function as static multicast MAC addresses configured on the interface.

  • The following table lists the scenarios where IPv4 multicast MAC addresses (first 24 bits are 0x0100-5e and bit 25 is 0) are valid.


    Valid or invalid

    No other multicast services configured


    Layer 3 multicast or both Layer 2 and Layer 3 multicast configured


    IP address based Layer 2 multicast forwarding

    Valid, but may cause conflicts

    MAC address based Layer 2 multicast forwarding

    Valid, but may cause conflicts

    A conflict occurs in the following situation: If IGMP snooping is enabled, the switch modules forwards multicast packets based on destination MAC addresses of the packets. When a static multicast MAC address is configured, a conflict may occur, causing data forwarding errors. For example, the VRRP protocol uses a permanent IPv4 multicast address, which is mapped to multicast MAC address 01-00-5E-00-00-12. If 01-00-5E-00-00-12 is configured as a static multicast MAC address, VRRP protocol packets cannot be forwarded normally. Therefore, you are advised not to configure static multicast MAC addresses when the switch modules is running IGMP snooping.

Updated: 2019-08-09

Document ID: EDOC1000041694

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