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Cisco Bug: CSCur26244 - Nexus 6000/5600 packet drops with no drop traffic

Last Modified

Oct 27, 2020

Products (1)

  • CiscoPro Workgroup EtherSwitch Software

Known Affected Releases

7.0(6)N1(0.272) 7.1(0)N1(0.368)

Description (partial)

Symptom:Slow FC or FCOE Performance with Nexus 5600/6000
Selective Retransmission Request (SRR) may be logged on host or storage.

Drops on the egress on a Nexus 5600/6000, for a no-drop class of traffic.
Note: TAC will confirm packet loss

Conditions:Applies only when all of the following are true:
1. Running 10g OR 40g fabric mode 
2. Nexus 5600/6000 platform 
3. Running NX-OS version 7.0(6)N1(1) or prior.

This is seen with 10G fabric mode when traffic flow is high for a single class of traffic, and multiple ingress ports send data to the same egress port
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