Troubleshoot IP Multicast over Fabric Connect for Layer 2 VSNs

If traffic is not moving properly, use the following procedure to determine the issue.

Procedure

  1. Enter Privileged EXEC mode:

    enable

  2. Ensure that all switch nodes in the network operate with the most recent software release to support IP Multicast over Fabric Connect:

    show software

  3. Ensure that you create and enable SPBM infrastructure globally.
    1. Ensure that SPBM is enabled globally:

      show spbm

    2. Ensure that IS-IS is enabled globally:

      show isis

    3. Ensure an SPBM instance exists with at least one Backbone VLAN (B-VID). Also ensure multicast is enabled:

      show isis spbm

  4. Ensure that you enable the CFM configuration.
    1. Ensure a CFM maintenance-association exists:

      show cfm maintenance-association

    2. Ensure a CFM maintenance-domain exists:

      show cfm maintenance-domain

    3. Ensure a maintenance-endpoint exists in the MEP ID column and is enabled in the ADMIN column:

      show cfm maintenance-endpoint

  5. Ensure a Customer VLAN (C-VLAN) exists and ensure you add UNI ports to the C-VLAN.
    1. Display C-VLAN information:

      show vlan i-sid

    2. Display ports for the C-VLAN:

      show vlan members port {slot/port[/sub-port][-slot/port[/sub-port]][,...]}

    3. Display NNI and UNI receivers:

      show isis spbm ip-multicast-route detail

  6. Ensure that you assign the same I-SID to the C-VLAN on all of the BEBs where you configure the C-VLAN:

    show vlan i-sid

  7. Ensure that you enable IP Multicast over Fabric Connect globally:

    show isis spbm

  8. Ensure the you enable IGMP Snooping on the C-VLAN on all of the Backbone Edge Bridges (BEBs). Ensure the protocol configured on the VLAN added is snoop-spb in the MODE column, which indicates IGMP is enabled on a VLAN with an associated I-SID (IP Multicast over Fabric Connect for a Layer 2 VSN):

    show ip igmp interface

  9. Ensure that you enable IGMP Snooping on access Layer 2 switches to prevent flooding of multicast traffic to non-receiver ports:

    show ip igmp snoop-trace

    show ip igmp interface

  10. Ensure that the IGMP version used by the multicast hosts and the Layer 2 switches outside the SPBM network is the same as the IGMP version configured on the C-VLAN:

    show ip igmp interface