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Cisco Bug: CSCun84535 - MPLS packets looping inside the NP during link flaps with ecmp path

Last Modified

Sep 22, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)

Symptom:Fast increment of PARSE_REDIRECT_MPLS_LoopPASS_CNT NP counter. Example:

RP/0/RSP0/CPU0:a9k#show controllers np counters all location 0/0/CPU0 | inc LoopPASS
 673  PARSE_REDIRECT_MPLS_LoopPASS_CNT               2480792981007     3352505

Conditions:Observed on Ethernet Line Cards (aka Trident) of ASR 9000 series routers when an Equal Cost Multi-Path exists to a neighbor in MPLS network and one or more links on the path are flapping.
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