Cisco Bug: CSCvv37157 - ASR9K: L2MCAST traffic drops visible in the fabric-queue on Tomahawk LCs
Oct 01, 2020
- Cisco ASR 9000 Series Aggregation Services Routers
Known Affected Releases
Symptom: Multicast traffic drops visible in the fabric-queue for priority normal: RP/0/RSP0/CPU0:513E.G.53-ASR9006-1#show qoshal fabric-queue np 0 location 0/0/CPU0 [...] Ingress: QID 0x82 Entity: 0/0/0/4/8/2 Priority: Priority Normal Qdepth: 22 StatIDs: commit/drop: 0x107292/0x868a08 Statistics(Pkts/Bytes): Total Xmt 7206258655/10247284716722 Dropped 56/79632 [...] Ingress: QID 0x80082 Entity: 0/1/0/4/8/2 Priority: Priority Normal Qdepth: 22 StatIDs: commit/drop: 0x187292/0xa68a08 Statistics(Pkts/Bytes): Total Xmt 7206261691/10247288045190 Dropped 66/93852 RP/0/RSP0/CPU0:513E.G.53-ASR9006-1#show drops all location 0/0/CPU0 | inc TM Sun May 23 04:54:00.332 UTC [np:NP 0 TM 0] drop paks: 56 [np:NP 0 TM 1] drop paks: 66 Conditions: Issue is seen on Tomahawk based LCs when all the following conditions are met:  Multicast traffic or unknown-unicast(flood) traffic is ingressing on a L2 interface in a bridge-domain.  Bridge-domain has BVI configured.  The incoming L2 interface does not have any QoS policy applied in the ingress direction  The BVI interface does not have any QoS policy applied in the ingress direction.  There are one or more bridge-members (other than the BVI) where traffic needs to be multicasted/flooded.
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