Enabling IPv6 multicast group replacement

About IPv6 multicast group replacement

If the number of IPv6 multicast groups on a port reaches the upper limit, the port automatically drops MLD reports for new groups. After you enable the IPv6 multicast group replacement feature, the port leaves an IPv6 multicast group that has the lowest IPv6 address and joins the new group contained in the MLD report. This feature is typically used in the channel switching application.

Restrictions and guidelines

This feature takes effect only on the multicast groups that the port joins dynamically.

This feature does not take effect if the following conditions exist:

Enabling IPv6 multicast group replacement globally

  1. Enter system view.

    system-view

  2. Enter MLD-snooping view.

    mld-snooping

  3. Enable IPv6 multicast group replacement globally.

    overflow-replace [ vlan vlan-list ]

    By default, IPv6 multicast group replacement is disabled globally.

Enabling IPv6 multicast group replacement on a port

  1. Enter system view.

    system-view

  2. Enter Layer 2 interface view.

    • Enter Layer 2 Ethernet interface view.

      interface interface-type interface-number

    • Enter Layer 2 aggregate interface view.

      interface bridge-aggregation interface-number

  3. Enable IPv6 multicast group replacement on the port.

    mld-snooping overflow-replace [ vlan vlan-list ]

    By default, IPv6 multicast group replacement is disabled on a port.