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Cisco Bug: CSCup94873 - Peer MEPs may detect transient faults from an EFD'd EFP

Last Modified

Jan 08, 2017

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

3.9.1.BASE

Description (partial)

Symptom:

On a Cisco IOS-XR router with CFM MEPs configured on an interface or sub-interface.
If a MEP on the (sub)interface detects an error condition which brings down the (sub)interface using Ethernet Fault Detection (EFD), then Peer MEPs of higher level down-MEPs may detect transient errors.

Conditions:

This symptom is observed when all of the following conditions occur:
  There are at least two MEPs configured on a (sub)interface, each in a CFM service with Ethernet Fault Detection (EFD) enabled.
  At least one MEP with EFD enabled detects an error condition which brings down the (sub)interface using EFD.
  There is at least one down-MEP in a higher level CFM domain than the MEP detecting the original fault.
  Any down-MEP which is in a higher level CFM domain than the MEP detecting the original fault, including those in a CFM service without EFD enabled, is affected.
Peers of the affected down-MEPs may detect transient errors.
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