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Cisco Bug: CSCum98099 - BGP IPv4 MDT routes are lost after reload

Last Modified

Apr 17, 2019

Products (1)

  • Cisco IOS

Known Affected Releases

15.1(3)S3.4

Description (partial) 

Symptom:
IPv4 MDT routes are not received from RR
if neighbor reload or redundancy switch-over

The sh bgp summary will show the neighbor state as "NoNeg(Idle)"

Conditions:
neighbor and UUT have a BGP adjacency 
neighbor (in the case is a c10k) is running 12.2(33)SB, 12.2(33)SRB to 12.2(33)SRE
UUT is running XE3.4 or after

BGP Graceful-restart is enabled
More than 1 address-families are enabled on BGP, in the case were VPNv4 and IPv4 MDT.
Any kind of peering, in the case it was PE(neighbor)-RR(UUT).  But the same issue can apply to other BGP peering scenario.
UUT is non-passive mode (default)
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