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Cisco Bug: CSCup95584 - change in behavior when processing max metric in an LSA "Reoptimizatio

Last Modified

Sep 12, 2019

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1.11.MPLS

Description (partial)

Symptom:
When metric is  change to  MAX_METRIC-1.  LSA "Reoptimization occurs  very frequently.
Current XR head-end   behavior attempts to find a better path for all tunnels whenever it
   receives an LSA which contains a MAX_METRIC-1 value. We do not try to find
out if the LSA was triggered by a metric change to MAX_METRIC-1 or came   for some other reason. Below is an example of what is causing this   behavior.

Conditions:
1)      Junos router changes the metric on a link to MAX_METRIC-1. An LSA
   is flooded.

   2)      Asr9k receives the LSA. It sees a max metric value in the LSA and
   attempts to reoptimize all tunnels.

   3)      Some local topology change occurs at the same Junos router (link
   up/down, metric change, affinity change, etc). An LSA is flooded.

   4)      Asr9k receives the LSA. It notices the Junos router has a link
   with its metric set to MAX_METRIC-1. It will attempt again to reoptimize
   all tunnels.
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