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Cisco Bug: CSCup01145 - TE traffic outage about 4 minutes across switchover

Last Modified

Jun 08, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1.2.MPLS

Description (partial)

Symptom:
When a primary RP (or DSC in the case of nV cluster) switchover occurs
and  interface down events are followed at the same time, a TE tunnel keeps
the dead interface as the outgoing interface about 4 minutes.

This causes VPN (ether L3 of L3) traffic outage which has been being carried
over the TE tunnel destined to the peer PE, whose route in the RIB is pointed to the
TE tunnel as the outgoing interface by autoroute announce.

LDP or BGP session with the peer on the TE tunnel will be brought down with the 
default hold timer values. Routing sessions cannot be established until  the
TE is recalculated and re-established again (through a new valid path).
 
The outage is reduced from 4 minutes to about 30 seconds in 5.2.0 or later.

Conditions:
RP (or DSC in the nV cluster case) fail-over occurs, and interface down events occur at the same time.
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  • Full Description (including symptoms, conditions and workarounds)
  • Status
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