Current MLD configuration

The following information applies to all MLD-enabled VLANs:
Control unknown multicast

If this is set to YES, any IPv6 multicast packets that are not joined by an MLD host are sent only to ports that have detected a multicast router or ports that are administratively forwarded.

If this is set to NO (or if MLD snooping is disabled), unjoined IPv6 multicast packets are flooded out all ports in the VLAN.

Forced fast leave timeout

Interval between an address-specific query and a forced fast leave (assuming no response), in tenths of seconds.

For each VLAN that has MLD enabled:
  • Whether MLD is enabled on the VLAN (default NO, but the VLAN will not show up on this list unless MLD is enabled).

  • Whether the switch can act as querier for the VLAN (default YES).

  • The MLD version (1 or 2)

MLD configuration for a specific VLAN

Switch# show ipv6 mld vlan 500 config

 MLD Service Vlan Config

  VLAN ID                               : 500
  VLAN NAME                             : VLAN500
  MLD Enabled [No]                      : Yes
  Querier Allowed [Yes]                 : Yes
  MLD Version                           : 2
  Strict Mode                           : No
  Last Member Query Interval (seconds)  : 10
  Robustness-Count                      : 2
  Port Type        Port Mode    Forced Fast Leave  Fast Leave  Fast Learn
  –––– –––––––––-––––––––– ––––––––––––––––– ––––––––––------------------
  1   100/1000T    forward      No                 Yes         No
  2   100/1000T    forward      No                 Yes         No
  3   100/1000T    forward      No                 Yes         No
  46  100/1000T    blocked      No                 Yes         No
  47  100/1000T    blocked      No                 Yes         No
  48  100/1000T    auto         No                 Yes         No

  • VLAN ID and Name

  • MLD enabled: whether MLD is enabled on the VLAN (default NO, but the information for this VLAN will be listed only if MLD is enabled)

  • Querier Allowed: whether the switch is allowed to act as querier on the VLAN

  • MLD version

  • Strict Mode: whether strict mode is enabled

  • Last Member Query Interval: showing the amount of time the querier waits for a response from members, in seconds

  • Query Interval showing the length of time between membership queries, in seconds

  • Query Max. Response Time displaying the number of seconds to wait for a response to a query, in seconds

  • Robustness-Count displaying the number of times to retry a query

  • Port information for each IPv6 multicast group address in the VLAN (general group command) or for the specified IPv6 multicast group address (specific group command):
    • Group multicast address.

    • Last reporter: Last MLD host to send a join to the group address.

    • Group expiry: Time until the group expires if no further joins are seen.

    • Port name for each port.

    • Port type for each port: Ethernet connection type.

    • Port mode for each port:
      • auto

        (follows MLD snooping rules, that is, packets are forwarded for joined groups)

      • forward

        (all multicast packets are forwarded to this group)

      • blocked

        (all multicast packets are dropped, except that packets for well-known addresses are forwarded)

      • Expiry time for each port: Amount of time until this port is aged out of the multicast address group, unless a join is received.

  • whether Forced Fast Leave is enabled or disabled

  • whether Fast Leave is enabled or disabled

  • whether Fast Learn is enabled or disabled - not in sw commands