Cisco Bug: CSCtd05282 - Saw %ROUTING-BGP-3-NEGCOUNTER msg during route flap
Feb 05, 2017
- Cisco Carrier Routing System
Known Affected Releases
3.8.0.ROUT 3.8.2.ROUT 3.8.3.ROUT 4.0.0.BASE
Symptom: During route flapping, the number of bestpaths under neighbor address family is updated incorrectly. Condition: The reproted problem occurs when (a) UUT has learned a prefix from two peers, (b) UUT selected path #1 as bestpath over path #2 and imported it into local same-rd table, and (c) the peer who sent path #1 sends an implicit withdrawal where the new path is not preferred over path #2. When BGP receives the new path (implicit withdrawl), BGP ends up skipping to update (i.e. decrement) the bestpath counter. Similarly, when the peer who sent path #1 sends another implicit withdrawl with prefered path over path #2, BGP skips to update (i.e. increment) the bestpath counter.
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