Cisco Bug: CSCus77973 - NCS6K HA Fabric Lost Packets with 5 planes
May 09, 2018
- Cisco Network Convergence System 6000 Series Routers
Known Affected Releases
---Start of Note Titled: Release-note--- Symptom: In a multi-chassis router with one of the fabric planes shut down, line-rate traffic with small packets (256Bytes) suffers packet loss to the tune of 5% when one or more FIA devices have a reachability of less than 5 planes (30 links). Conditions: When all the links in the fabric are up and all planes are up, this setting will not have any adverse impact. But when a plane is down (bringing the total number of links from/to FIAs to 30) and one or more FIA devices have fewer than 30 links up towards them, the all-reachability vector on all FIAs are reduced to less than 30. In this scenario, all FIAs end up using a number of links less than 30 to arrive at the total credits. Depending on how many links are down to the affected FIA, the total credits could be much less than that needed for doing line-rate traffic.
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Bug Details Include
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