[c-nsp] About bgp fast-external-fallover

[Hiromasa Sekiguchi]

Hi,

I configured "neighbor x.x.x.x fall-over" commands.
I checked that iBGP peer went down immediately after link down on iBGP.

I think it is useful command on iBGP.

Regards,
Hiromasa


Oliver Boehmer (oboehmer) wrote [2008/03/07 17:19(JST)]:
> Christian Meutes <> wrote on Friday, March 07, 2008 9:10 AM:
> 
>> Hi,
>>
>> --On Freitag, 7. März 2008 12:48 +0900 Hiromasa Sekiguchi
>> <hiromasa.sekiguchi at ctc-g.co.jp> wrote:
>>
>>> The cisco products have "bgp fast-external-fallover" function.
>>> It is available on only eBGP, isn't it?
>>>
>>> We'd like to do same behabior like it on iBGP.
>>> So, is there any solutions?
>> Many new releases have something similar for iBGP learned prefixes
>> which is enabled by default. Check for 'BGP Support for Next-Hop
>> Address Tracking'. 
> 
> Right. And there is actually a feature "Fast Session Deactivation" which builds on address tracking which takes down the session when the next-hop goes away. Hoever, this is usually a bad idea for iBGP, it's better letting "regular" next-hop tracking invalidate the paths rather than taking down the whole session.
> 
> 	oli