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Input Buffer Drops without any congestion may be observed for interfaces of ACI Leaf switches. It may lead to fault F100264 - ingress buffer drop packets rate (eqptIngrDropPkts5min:bufferRate) No correspoding memory or OPG/class drops observed
Forwarding Drops misclassified as Input Buffer drops. - Generally observed for flooded traffic with forwarding decision as drop. - So far observed with EX cloud scale ASIC switches. - Traffic is marked/classified as COS4/CS4 and internally matches SPAN ACL to avoid re-replication of SPAN traffic.
Avoid offending traffic if possible or ignore these input buffer drops
Not all Input buffer drops are invalid, valid scenario includes traffic reaching CPU in burst causing this class buffer to exhaust. Its important to check against class drops (LCPU class) using command: vsh_lc -c "show platform internal hal qos bax_drop_counters"
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