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Cisco Bug: CSCur17985 - PW imposition traffic drop due to ECMP/bundle load-balance type wrong

Last Modified

Sep 12, 2019

Products (7)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

4.2.3.BASE

Description (partial)

Symptom:
VPLS PW imposition traffic dropped on egress LC/NP due to ECMP/bundle load-balance type wrong. The impacted traffic is flooding/multicasting traffic. Unicast traffic is not impacted.

Conditions:
When "load-balancing flow [src-dst-mac|src-dst-ip]" is configured in L2VPN, the VPLS PW data plane has hit the error condition in which some PWs do VC-label hashing and others do flow based hashing. 
This condition causes inconsistency between ingress LC and egress LC in handling PW imposition traffic ECMP/bundle load-balancing. In the worse case, traffic is dropped on egress LC.

The traffic loss symptom cannot be triggered by moving the port around or adding/deleting ports.  It can happen after LC reload or l2vpn loandbalance configuration changes.
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Bug Details Include

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  • Status
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