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Cisco Bug: CSCup53622 - BFD w/ fast keep alive flaps on sat access when ICL member added/removed

Last Modified

Feb 16, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1(3)

Description (partial)

Symptom:
Traffic Impact of 2-6 Sec on SAT Access, Bundle ICL - Mem Added/removed

Conditions:
1) Satellite access ports with ICL bundle mode
2) BFD running on satellite access ports at fast keep alive (eg 100ms x 3 timeout)
3) ICL bundle membership is changed (member is added or removed)


Note that traffic impact of 2-6 seconds is because BFD flaps and then causes subsequent higher layer traffic convergence. Without BFD being used, the actual traffic impact during a ICL bundle membership addition/ deletion is still sub-second. Further more, if instead of bundle membership configuration change, its just a regular ICL bundle failover then the traffic impact is well below sub-second (typically <200ms altough may depend on type of satellite being used).
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