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Cisco BGP Timer Adjustments

Posted on 2012-08-12
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Last Modified: 2012-08-17
Hello Experts,

Our ISP are suggesting that we change our BGP timers to holdtime of 20 and keepalive to 5 seconds. We will probably go ahead with it, however can someone please tell me what are the pitfalls?

I know that if our IGP is unable then BGP my reset often. However, I was wondering if there are anything else I should look out for?

Cheers

Carlton
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Question by:cpatte7372
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bplantier earned 2000 total points
ID: 38287149
If you decresase the HoldTime and keepalive to 20 / 5 instead of the default values of 180 / 60 you will have:

- a small cpu increase. Maybe not noticable.
- a small bandwith increase. Maybe not noticable
- a faster convergence in a case of failure.
- a decrease of the stability as you already noticed.

Remarks:
*If you receive a big BGP routing table, the CPU overhead induced by the up and down of the BGP session will be a problem.

*If you are advertising some route to the public internet backbone, you may be blacklisted because of route dampening if your ISP goes up and down.

*Usually, a ratio of 1:3 between keepalive and holdtime is advised but 1:4 is maybe a good ratio also, moreover with the fast keepalive you have.

*For private peering, or with only a default route, those are good timers.
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by:cpatte7372
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Cheers mate.
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