Troubleshooting Guide

Name Description
FrameSize Specifies the frame-size. The default is 0.
Sourcemode Specifies the source mode of the transmit loopback
service:
• nodal
• noVlanMac — Use this value with C-VLAN only.
When you select this option, even if a VLAN MAC
address exists, the system uses the CFM C-MAC
as the BMAC-SA.
• smltVirtual — Use the smltVirtual option with B-
VLANs only.
The default is nodal.
Triggering linktrace
Use the following procedure to trigger a linktrace. The link trace message is often compared to
traceroute. An MEP transmits the Linktrace Message packet to a maintenance endpoint with
intermediate points responding to indicate the path of the traffic within a domain for the purpose of
fault isolation. The packet specifies the target MAC address of an MP, which is the SPBM system ID
or the virtual SMLT MAC. MPs on the path to the target address respond with an LTR.
Before you begin
• On the source and destination nodes, you must configure a CFM MD, MA, and MEP.
• Enable the MEP.
• Assign a nodal MEP to the B-VLAN.
Procedure
1. In the navigation tree, expand the following folders: Configuration > Edit > Diagnostics.
2. Click CFM.
3. Click the LTM tab.
4. Configure the linktrace test properties as required.
5. Click Apply.
6. To trigger the linktrace test, double-click in the Status field, select transmit, and then click
Apply.
OR
Highlight an entry, and then click Start.
7. To update the linktrace, click the Refresh button.
8. To stop the linktrace, click Stop.
9. To view the results of the linktrace, click Result.
Operations and Management
January 2017 Troubleshooting 206
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