From: kenairs (kenairs@xxxxxxxxxxx)
Date: Tue Feb 05 2002 - 10:34:18 GMT-3
Any one can produce example with Routers diagram so that we can simulate ?
Tks
----- Original Message -----
From: Wade Edwards <wade.edwards@powerupnetworks.com>
To: Libone Mhlanga <libone@lycos.com>
Cc: <ccielab@groupstudy.com>
Sent: Tuesday, February 05, 2002 7:30 AM
Subject: RE: confeds and the zero length (confed-external) as-path
> This is an interesting problem. I assume that the confederation AS_PATH
> attributes get stripped off when the route moves to the Adj-RIB-out for
> an eBGP peer. But, as I remember, this is when the route-maps,
> prefix-lists, filter-lists and distribute-lists are also applied. If
> they are not done in the correct order then the AS_PATH attribute will
> contain the confederation AS_PATH attributes and the route-map will
> filter this route because it does contain AS_PATH information. I am not
> sure when the confederation AS_PATH attributes are stripped but it looks
> like, at least in the IOS version you have, is being done after the
> route-map is being evaluated.
>
> Can you check another version of code and see if this problem persists?
>
> L8r.
>
> -----Original Message-----
> From: Libone Mhlanga [mailto:libone@lycos.com]
> Sent: Monday, February 04, 2002 3:55 PM
> To: ccielab@groupstudy.com
> Subject: confeds and the zero length (confed-external) as-path
>
> People,
> Halabi says sub-AS's are not counted in calculating the path length,
> therefore on his AS border routers he has confgured a filter-list to
> allow only locally originated routes ( ie ^$ ).
>
> Problem:- when I try this I find that the border routers will NOT
> advertise any routes they have learnt from the other sub-AS eg the bdr
> rtr in sub-AS 65060 will not advertise to its EBGP peer any routes
> originated in sub-AS 65050 ie the ones with just (65050) in the path.
> When I remove the ^$ filter-list it does. So I either have a dodgy level
> of IOS 11.2(18) or Halabi's statement is not true.
>
> Any comments ?
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