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New Member

Strange BGP message + high CPU load

Hi,

Since 2 weeks I see strange BGP message and peaks of CPU load of 95%

for BGP Scanner process every 2 hour.

May 30 14:59:18 CEST: BGP(0): For aggregate 195.35.128.0/17

May 30 14:59:18 CEST: BGP(0): 195.35.128.0/17 subtree has an entry 195.35.128.0/17

May 30 14:59:18 CEST: BGP(0): 195.35.128.0/17 subtree has an try 195.36.0.0/18

May 30 14:59:18 CEST: BGP(0): Need not be re-aggregated

May 30 14:59:18 CEST: BGP(0): For aggregate 195.85.128.0/18

May 30 14:59:18 CEST: BGP(0): 195.85.128.0/18 subtree has an entry 195.85.128.0/18

May 30 14:59:18 CEST: BGP(0): 195.85.128.0/18 subtree has an try 195.86.0.0/16

May 30 14:59:18 CEST: BGP(0): Need not be re-aggregated

May 30 14:59:18 CEST: BGP: 195.85.155.97 rcv message type 4, length (excl. header) 0

May 30 14:59:20 CEST: BGP(0): Aggregate processing for IPv4 Unicast

Any ideas ?

Thanks in advance,

E. Tantsura

3 REPLIES
New Member

Re: Strange BGP message + high CPU load

Hello E.

Check Link flapping, or around LAN spanning tree change...;

BGP is consuming a lot CPU cycle during Table calculation, and doesn't like

topologie change (router running BGP too).

Can check also, Buffer lack (sh inter, check for in or out drop).

.

Can check also your config regarding Loops. I don't like "need not be re-aggregated". doesn't look clean and can generate burden

Anyway this look like network instability.

hope this help

Regards Patrick

Gold

Re: Strange BGP message + high CPU load

Do a show debug and see what it says. These messages indicate that the BGP scanner is doing what it is supposed to do, but the proc util does sound a bit high. Are you running full internet routing tables? From how many peers? Turning off the debug that's spitting the message out may reduce your proc util to a reasonable level.

Russ

New Member

Re: Strange BGP message + high CPU load

Hi Russ,

Thanks a lot.

I'm running full internet routing tables but it's not a problem,

the router is 7507 with 256 Mb RAM.

The strange thing is that cpu load peaks(BGP scanner process) are every 2 hours, but not beetwen 12 and 6 am and it began 3 weeks ago.

I didn't upgrade IOS or something like this....

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