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BFD down due to that BGP session flapping

R Manjunatha
Level 3
Level 3

Hi 

We have a connection from on-premises to Azure via the ExpressRoute virtual router, with BFD enabled. The BFD interval is set to 1000ms on the on-premises side and 300ms on the Azure side. However, the BGP session is frequently resetting due to BFD being down. Can anyone suggest a solution to stabilize this link?

regards,

 

9 Replies 9

balaji.bandi
Hall of Fame
Hall of Fame

what is the Logs show on the Device, what device on-premisses (router and IOS running)

check some troubleshooting tips :

https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/220364-troubleshoot-bidirectional-forwarding-de.html

Try disabling the BFD and see is the BGP stable ? (for troubleshooting)

 

BB

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What is the min_rx and max age set to on either end? 

Happy to help! Please mark as helpful/solution if applicable.
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as per the BFD template min-tx 1000 and min-rx 1000 multipliers 3 

R1-bfd 1000ms------to-----Azure --- bfd 300ms

 

could you please confirm if high bandwidth utilization due to the BFD session will go down very often 

Why you use mismatch interval in each side?

MHM

any update ?

MHM

 Do mismatch intervals lead to any issues with the link?

Friend 

Before I reply can I know the platform you have?

MHM

Hello
Suggest remove bfd and see if the peering stabilise  


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