[c-nsp] IOS reading my mind...

[Oliver Boehmer (oboehmer)]

Mark,

I think this behavior was introduced as part of the "BGP Dynamic Update
Peer-Groups" feature
(http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newf
t/120limit/120s/120s24/s_bgpdpg.htm).

Once you change the outgoing policy of a neighbor (i.e.
filter-list/dist-list/different route-map, etc.), IOS re-calculates this
peer's group membership and performs a route refresh. 

	oli

Mark Kent <> wrote on Thursday, November 17, 2005 6:08 PM:

> On two 7206, one running 12.2(18)S8 and one running 12.2(25)S5,
> I appear to prematurely get the effect of a 'clear ip bg ... soft out'
> when I make a change in the bgp config.
> 
> I just did this:
> 
> replaced:
>    nei x.y.z.w filt 99 out
> with:
>    nei x.y.z.w filt 1 out
> 
> where 99 is deny .* and 1 is permit ^$ and I noticed that the port
> started picking up traffic, and a query to an external route server
> confirmed that I didn't need to do the clear.
> 
> Likewise, yesterday on the 12.2(18)S8 machine I changed a
> route-map to prepend my AS and that change also was propagated
> without the need for a soft clear.
> 
> I can't blame internal route instability for this because
> a) I don't have any, and b) if I did then I'ld surely notice
> as we would get dampened fairly rapidly.
> 
> Any idea what is going on?
> (I'm willing to accept "You're crazy." as an explanation.)
> 
> Thanks,
> -mark
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