Troubleshooting Guide

Before you begin
• On the source and destination nodes, you must configure an autogenerated or an explicit CFM
MD, MA, and MEP.
• Enable the MEP.
• Assign a nodal MEP to the B-VLAN.
Procedure
1. Log on to the switch to enter User EXEC mode.
2. Trigger a Layer 2 tracemroute on the VLAN:
l2 tracemroute source <A.B.C.D> group <A.B.C.D> vlan
<1-4059>[priority <0–7>] [ttl—value <1–255>]
Note:
For the preceding command, if you do not specify a VLAN, l2 tracemroute uses the
global default VRF.
Wait for the l2 tracemroute to complete or press any key to abort.
3. Trigger a Layer 2 tracemroute on the VRF:
l2 tracemroute source <A.B.C.D> group <A.B.C.D> vrf WORD<1–16>
[priority <0–7>] [ttl—value <1–255>]
Note:
For the preceding command, if you do not specify a VRF, l2 tracemroute uses the
global default VRF.
Wait for the l2 tracemroute to complete or press any key to abort.
Example
The following is a sample output for a Layer 2 tracemroute on a VLAN:
Switch:1>enable
Switch:1#configure terminal
Switch:1(config)#l2 tracemroute source 192.0.2.81 233.252.0.1 vlan 201
Please wait for l2 tracemroute to complete or press any key to abort.
Source 192.0.2.81
Group: 233.252.0.1
VLAN:201
BMAC: 03:00:03:f4:24:01
B-VLAN: 10
I-SID: 16000001
===============================================================
1 PETER4 00:03:00:00:00:00 -> LEE1 00:14:0d:bf:a3:df
2 LEE1 00:14:0d:bf:a3:df -> LEE2 00:15:e8:b8:a3:df
Operations and Management
January 2017 Troubleshooting 176
Comments on this document? [e-mail]