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Cisco Bug: CSCvv16454 - Traffic failure due to MPLS ECMP load-balancing in one of the labelled path

Last Modified

Aug 31, 2020

Products (1)

  • Cisco ASR 920 Series Aggregation Services Router

Known Affected Releases


Description (partial)

In a particular case, customer observed an outage for certain flows when he had two ECMP paths from node A to node B. One of the paths was labeled(A connected to B via another node), and the other unlabeled(direct connection between A and B, resulting in PHP). Traffic flows that were being hashed to the labeled path was being dropped since the ASR-920 would forward it with an incorrect label in the data plane, even though the control plane showed the correct labels programmed.

Whenever there is ECMP available and any of the paths are labeled.
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