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Cisco Bug: CSCvt87791 - PCE unable to compute NODE+SRLG disjoint path in complex topologies

Last Modified

Jul 16, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.2.1.BASE

Description (partial)

Symptom:
When an operator requests NODE+SRLG disjoint path to be computed by the PCE, in certain conditions the algorithm may not be able to find a path satisfying both node and SRLG disjointness, in which case it will fall back to only SRLG-disjoint path (if topology permits).

Conditions:
This condition can happen in large and complex networks with many available paths. It most often happens when the shortest paths between the pairs of sources/destinations share the same SRLG group.
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