01-04-2013 07:48 PM - edited 03-04-2019 06:35 PM
Hi guys , what would you do to make bgp converge fast , what is the best way or recommands ?
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01-04-2013 09:18 PM
It's never going to converge as fast as an igp (even ibgp is slow). The best way to do it is to change the timers. You can do this under the routing process:
router bgp 100
bgp timers 7 21
7 is the hello time and 21 is the hold time. This is different from the 60 and 180 that is the default. Once you change the timers, you possibly will need to clear the peering in order for the changes to take effect. The lower timers of the two peers are used. To see the current timer, you can do a "show ip bgp neighbor x.x.x.x" and look for the timers listed on the second line (I believe although could be incorrect).
HTH,
John
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01-05-2013 05:17 AM
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The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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Posting
Something that may help with the initial BGP load, if there's numerous prefixes, is to enable PMTUD and increase the TCP receive window size.
01-04-2013 09:18 PM
It's never going to converge as fast as an igp (even ibgp is slow). The best way to do it is to change the timers. You can do this under the routing process:
router bgp 100
bgp timers 7 21
7 is the hello time and 21 is the hold time. This is different from the 60 and 180 that is the default. Once you change the timers, you possibly will need to clear the peering in order for the changes to take effect. The lower timers of the two peers are used. To see the current timer, you can do a "show ip bgp neighbor x.x.x.x" and look for the timers listed on the second line (I believe although could be incorrect).
HTH,
John
*** Please rate all useful posts ***
01-05-2013 05:17 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Something that may help with the initial BGP load, if there's numerous prefixes, is to enable PMTUD and increase the TCP receive window size.
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