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Cisco Bug: CSCsz01370 - MSDP flaps on AT&T lab routers due to blockage on ARM

Last Modified

May 09, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

3.5.2.BASE 3.6.3.BASE

Description (partial)

MSDP sessions flap after an NDSC RP failover. This was seen with and without Inactive peers.

During an NDSC RP FO, the routes to the MSDP peers might change (move to max-metric and come back to
normal metric, for example). In a Multi-Chassis (4+1, in this case), MSDP is blocked for a long time
on ARM/sysdb_mc and that causes the Established sessions to flap. The failure has been seen only in
a Multi-Chassis system.
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