Trigger a Layer 2 multicast traceroute. Enable Connectivity Fault Management (CFM) to debug Layer 2.
l2 tracemroute source {A.B.C.D} group {A.B.C.D}
l2 tracemroute source {A.B.C.D} group {A.B.C.D} priority <0-7>
l2 tracemroute source {A.B.C.D} group {A.B.C.D} ttl-value <1-255>
l2 tracemroute source {A.B.C.D} group {A.B.C.D} vlan <1-4059>
l2 tracemroute source {A.B.C.D} group {A.B.C.D} vrf WORD<1-16>
Specifies the VLAN ID in the range of 1 to 4059. By default, VLAN IDs 1 to 4059 are configurable and the system reserves VLAN IDs 4060 to 4094 for internal use. On switches that support the vrf-scaling and spbm-config-mode boot configuration flags, if you enable these flags, the system also reserves VLAN IDs 3500 to 3998. VLAN ID 1 is the default VLAN and you cannot create or delete VLAN ID 1.
None
User EXEC
The l2 tracemroute command displays the following information for a VLAN:
| 
                         Output field  | 
                     
                         Description  | 
                  
|---|---|
| 
                         Source  | 
                     
                         Specifies the source IP address of the flow where the multicast trace tree originates.  | 
                  
| 
                         Group  | 
                     
                         Specifies the IP address of the multicast group.  | 
                  
| 
                         VLAN  | 
                     
                         Specifies the VLAN.  | 
                  
| 
                         BMAC  | 
                     
                         Specifies the backbone MAC address.  | 
                  
| 
                         B-VLAN  | 
                     
                         Specifies the backbone VLAN.  | 
                  
| 
                         I-SID  | 
                     
                         Specifies the service identifier.  | 
                  
The l2 tracemroute command displays the following information for a VRF:
| 
                         Output field  | 
                     
                         Description  | 
                  
|---|---|
| 
                         Source  | 
                     
                         Specifies the source IP address of the flow where the multicast trace tree originates.  | 
                  
| 
                         Group  | 
                     
                         Specifies the IP address of the multicast group.  | 
                  
| 
                         VRF  | 
                     
                         Specifies the VRF.  | 
                  
| 
                         BMAC  | 
                     
                         Specifies the backbone MAC address.  | 
                  
| 
                         B-VLAN  | 
                     
                         Specifies the backbone VLAN.  | 
                  
| 
                         I-SID  | 
                     
                         Specifies the service identifier.  |