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Community Member

Failover time using BFD

Hi Champs,

we have configured BFD in multihoming scenario with BGP routing protocol.Timer configuration is bfd interval 100 min_rx 100 multiplier 5.

Failover from first ISP to second ISP takes 30 sec and same from first ISP to second ISP takes more than 1min. Can you suggest reason for different failver times and how can i have equal failover time from both ISP.How convergence time is calculated in BGP + BFD scenario?

 

Regards

V

 

7 REPLIES
Community Member

Have you enabled bfd on bgp

Have you enabled bfd on bgp neighborship? I think the command is:

 

neighbor xxxx fall-over bfd

Community Member

of course..its enabled

of course..its enabled

Cisco Employee

Vicky,A simple topology would

Vicky,

A simple topology would help better understand the scenario. Do you have both the ISP terminated on same router or different router?.

 

How many prefixes are you learning?. Full internet table or few prefixes?.

 

Accordingly, you can consider BGP PIC or best external to speed up the convergence.

 

-Nagendra

Community Member

Hi ,Links are terminating on

Hi ,

Links are terminating on different router and only defualt route is learning

enabled BGP multipath for lnk load sharing

 

thanks

 

Community Member

Have you tried bfd fast

Have you tried bfd fast-detect under BGP?
 

Community Member

Does the ISP support BFD??

Does the ISP support BFD??

Community Member

If its enabled, BGP

If its enabled, BGP neighborship should get teared up immediately after the bfd failure (about 500-600ms)...

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