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

Enter Privileged EXEC mode:

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

show software
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
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
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
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
Ensure that you enable IP Multicast over Fabric Connect globally:

show isis spbm
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
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
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