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Cisco Bug: CSCtc46229 - BGP sessions flap with hold timer expiry with aggresive timers

Last Modified

Feb 03, 2017

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

3.8.2.BASE

Description (partial)

The problem is the flap of BGP sessions (with hold timer expiry notification) with non-default (keepalive) 
timer configuration triggered on servicing outbound refresh request (which for example could be  on 
account of outbound policy change) resulting in the update generation process to kick in to re-advertise 
the BGP routes to the neighbors.The root-cause of the problem was the blockage of the BGP write thread while servicing outbound update gen for the neighbors, resulting in the keepalive messages not being sent.


Symptom:

The problem is the flap of BGP sessions (with hold timer expiry notification) with non-default (keepalive) 

timer configuration triggered on servicing outbound refresh request (which for example could be  on 

account of outbound policy change) resulting in the update generation process to kick in to re-advertise 

the BGP routes to the neighbors.
Conditions:

The problem happens in ocurse of outbound update generation as described above.
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Bug Details Include

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