Troubleshooting Guide

• Simplified: In the simplified way of configuring CFM, you can use the simplified command cfm
spbm enable which automatically creates the MD, MA, MEP and associates it with the B-
VLAN and the MIP level with the B-VLAN.
Autogenerated CFM
CFM provides two methods for configuration; autogenerated and explicit. You cannot use both. You
must choose one or the other. Use the procedures in this section to configure autogenerated MEPs
that eliminate the need to configure a MD, MA, and MEP ID to create a MEP.
• For SPBM B-VLANs, you can use either autogenerated or explicitly configured CFM MEPs.
• For C-VLANs, you can only use autogenerated CFM MEPs.
Important:
Only the VSP 4000 Series switch supports configuring autogenerated CFM on C-VLANs.
The CFM show commands that display MD, MA, and MEP information work for both autogenerated
and explicitly configured CFM MEPs.
Previous explicit CFM configurations of MDs, MAs and MEPs on SPBM B-VLANs continue to
function in this release. However, if you want to enable the new autogenerated commands you must
first remove the existing MEP and MIP on the SPBM B-VLAN.
The switch only supports one MEP and one MIP, either autogenerated or explicitly configured, on
the SPBM B-VLAN. Similarly, the switch only supports one MEP and one MIP on the C-VLAN. This
means that if you want to use these autogenerated MEPs, you cannot use your existing CFM
configuration. You must first remove the existing MEP or MIP on the SPBM B-VLAN.
For information on configuring autogenerated CFM using the ACLI, see:
•
Configuring autogenerated CFM on SPBM B-VLANs on page 155
• Configuring autogenerated CFM on C-VLANs on page 157
Configuring autogenerated CFM on SPBM B-VLANs
Use this procedure to configure the autogenerated CFM MEP and MIP level for every SPBM B-
VLAN on the chassis. This eliminates the need to explicitly configure an MD, MA, and MEP ID, and
to associate the MEP and MIP level to the SPBM B-VLAN.
When you enable this feature, the device creates a global MD (named spbm) for all the SPBM
Nodal MEPs. This MD has a default maintenance level of 4, which you can change with the level
attribute. All the MEPs that the device creates use the MEP ID configured under the global context,
which has a default value of 1.
The nodal MEPs are automatically associated with the SPBM B-VLANs configured. The MIP level
maps to the global level. When you enable the feature, the device automatically associates the MIP
level with the SPBM B-VLANs configured. The feature is disabled by default.
CFM configuration using ACLI
January 2017 Troubleshooting 155
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