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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.

    Scenario

    Valid or invalid

    No other multicast services configured

    Valid

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

    Valid

    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 224.0.0.18, 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.

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Updated: 2019-08-09

Document ID: EDOC1000041694

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