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Cisco Bug: CSCtc79723 - BGP neighbor flaps when MTU is set too low and neighbor uses SSO / NSR

Last Modified

Aug 18, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(33)SB 12.2(33)SB3 12.2(33)SB7 12.2(33.1.39)SB7

Description (partial)


BGP neighbor flaps when there are many withdraw / updates are sent out to the 
1) RP is redundant and "ha-mode sso" is configured,
2) There are many withdraw that cannot be sent out in one update packet.
This is a follow on from defect: CSCtb36849. 
The behaviour this defect corrected, by nature of the fix does not work for 
implementations where the MTU is set to 961 or lower.
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