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Cisco Bug: CSCvs72112 - random-fill tiebreaker does not work

Last Modified

Sep 02, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.2.1.MPLS

Description (partial)

Symptom:
LSPs take paths not expected by the operator based on the ECMP tie-breaker.

Conditions:
The conditions to run into this issue are:
1- Multiple tunnels with signaled bandwidth configured
2- Tunnels use the random tie-breaker among equal-cost paths
3- Two or more equal cost paths but with different available bandwidth along the paths

When this issue happens, the paths chosen will not be randomly chosen between the equal-cost paths. 
Instead, the min-fill tiebreaker is used instead of random.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
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