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Cisco Bug: CSCub08714 - ASR1k : Mcast packet duplicated on periodic basis

Last Modified

Feb 08, 2017

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.1(1)S1

Description (partial)

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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