Cisco Bug: CSCub08714 - ASR1k : Mcast packet duplicated on periodic basis
Feb 08, 2017
- Cisco ASR 1000 Series Aggregation Services Routers
Known Affected Releases
Symptom: Poor performance for multicast on asr1k over dmvpn Conditions: 1) Multicast packet has to be coming in on a Tunnel interface (not a physical interface). 2) NS (negate signaling) flag has to be set on one of the interfaces in the MFIB (S,G) entry. If both these conditions are met, then the packet is punted to control plane & forwarded in software in addition to the hardware forwarding thus causing duplicates. Note that the NS punts are periodic/throttled and not all multicast packets are punted because of NS. Thus the duplication is intermittent/periodic.
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Bug Details Include
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