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Cisco Bug: CSCun44749 - MC: Discard not working for topaz/taiko MSC in rack >=2

Last Modified

Aug 07, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

5.1.3.BASE

Description (partial)

Symptom:
1. In a multi-chassis system on CRS-3/CRS-X MSCs are present in rack>=2 (from 5.1.1 release) or CRS-3 MSCs are present in rack>=4 if there are Ucast/Mcast drops (tail drops) are seen on the fabricQ statistics instead of discard drops at the ingressQs for these destinations.

2. Discard drops seen at IngressQ for destinations which don't have the fabricQ queues reach the threshold levels. 

This will not have impact on SC/B2B and MC with less than two racks.

Conditions:
Back-pressure from NPU/PSE to fabricQ causing queue build up at the fabricQ .
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