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. |