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Cisco Bug: CSCup75992 - CRS-X MC, ingressq taildrops seen due imbalance in s2-s3 with 7 planes

Last Modified

Jan 09, 2017

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

5.1.3.BASE

Description (partial)

Symptom:
With CRS-X fabric on a multi-chassis system , UCH line rate traffic is getting tail dropped with 7 planes up.

Conditions:
In CRS-X multi-chassis system on LCCs having CRS-X fabric when we have more that 4 CRS-X MSCs with UCL line rate traffic and then have a CRS-X MSC with UCH line rate. UCH traffic will be tail dropped. This was observed with UCH packets being 9600Bytes. Seen only when 7 planes are available.
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