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Cisco Bug: CSCus71609 - nV Cluster drops multicast traffic around 20 seconds in fail-over

Last Modified

Jul 20, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)

When the primary DSC of a nV Cluster is powed off, the multicast
traffic which is being forwarded on the bundle member interface on
the primary DSC suffers from 15 to 20 seconds of packet drop.
So far, this outage is found to be common to:
- IPv4 Native Multicast
- RSVP P2MP both for MVPN and VPLS
- mLDP for MVPN

As for the LSM case, 20 seconds of packet drop in chassis FO occurs 
when the nV cluster acts as pure-mid (transit label swap) or
bud role (both disposition and label swap are affected).

ASR9K nV cluster is used for
-IPv4 Multicast
- mGRE based MVPN

, and nV cluster is connected with bundle-ethernet with adjacent routers.
Multicast traffic is being forwarded in the primary DSC bundle member 
port as OIF. Fail-over is conducted by pimary DSC power-off.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Known Fixed Releases
  • Related Community Discussions
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