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ASR BGP routing MAX prefix?

Today, I found the log:

RP/0/RSP0/CPU0:Aug 30 18:28:24.645 : bgp[1052]: %ROUTING-BGP-5-MAXPFX : No. of IPv4 Unicast prefixes received from x.155.224.185 has reached 786768, max 1048576

That appear every 30 seconds. And found that it is the default limit on ASR https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r5-3/routing/configuration/guide/b_routing_cg53xasr9k/b_routing_cg53xasr9k_chapter_010.html#con_1088375.

So, do you have any recommend for the ASR which received internet routes should I change the maximum prefix or change the threshold would be better? And what is the recommended value?

 

Thank you very much.

Everyone's tags (5)
3 REPLIES 3
Cisco Employee

Re: ASR BGP routing MAX prefix?

Either way is acceptable, it really depends on how many routes you expect and when you want to be warned.

 

This is an older guide but command hasn't changed https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r4-0/routing/command/reference/rr40asr9kbook_chapter1.html#wp1389533032

 

Sam

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Re: ASR BGP routing MAX prefix?

If I only change the threshold, is there any service impact or reset BGP peer?

 

Thank you very much.

Everyone's tags (5)
Cisco Employee

Re: ASR BGP routing MAX prefix?

Only if the number of prefixes known by the peer(s) exceeds the configured maximum value would the peering go down.

 

Sam

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