Troubleshooting IP Multicast over Fabric Connect for Layer 3 VSNs

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

Procedure

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

    show software

  2. If ERS 8800 nodes exist in the network, ensure you upgrade them to the current release:

    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 the following on all the Backbone Edge Bridges (BEBs) where the Layer 3 VSN is present.
    1. Ensure that you enable IP multicast globally:

      show isis spbm

    2. Ensure that you create an IPVPN for the VRF:

      show ip ipvpn [vrf WORD<1–16>][vrfids WORD<0–512>]

    3. Ensure that you assign an I-SID to the VRF:

      show isis spbm ip-multicast-route all

    4. Ensure that you enable the MVPN:

      show ip vrf mvpn

  6. On the VLANs that need Layer 3 VSN IP Multicast over Fabric Connect routing, create an IP interface on the VLAN if one does not exist. The address should be on the same subnet as the IGMP hosts connected to the VLAN. Also, ensure that you enable IP Multicast over Fabric Connect.
  7. Enter VLAN Interface Configuration mode:

    enable

    configure terminal

    interface vlan <1–4059>

  8. Create an IP interface on the VLAN and enable IP Multicast over Fabric Connect:

    ip address <A.B.C.D>

    ip spb-multicast enable

  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

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