Comments on: Quick BGP Challenge #1

By: Ariel Weher

Ariel Weher — Sat, 13 Nov 2010 02:50:57 +0000

The origin solution looks best to me because this is checked before the AS_PATH length.

So, other crazy ways are filtering the network from R3 or put a shutdown on the R3 peering for a while so R2 have the most stable (aged) route .

Regards

By: loggi

loggi — Wed, 19 May 2010 09:46:31 +0000

R1(config)#route-map R2Origin permit 10
R1(config)#set origin incomplete
R1(config)#exit
R1(config-router)#nei R2 route-map R2Origin in

By: loggi

loggi — Wed, 19 May 2010 09:43:22 +0000

use the set origin command in the route-map configuration mode, the bgp path selection process simply does the rest. lol

By: Colby

Colby — Tue, 18 May 2010 21:04:02 +0000

Yep, that would work!

By: hoyosa

hoyosa — Tue, 18 May 2010 20:56:50 +0000

How about prepending announcements received from R2, with a route-map in the inbound direction, on R1?

router bgp 100
neighbor R2 remote-as 234
neighbor R2 route-map prepend-last-as in
neighbor R3 remote-as 234
!
route-map prepend-last-as permit 10
set as-path prepend last-as 2

By: errtime

errtime — Fri, 14 May 2010 10:17:08 +0000

yes, with configuring the source-ip.

By: Colby

Colby — Thu, 13 May 2010 19:09:30 +0000

And you can apply it to a specific neighbor?

By: errtime

errtime — Thu, 13 May 2010 19:00:12 +0000

argh, somehow my code is replaced with a smiley.

i meant,

distance [AD] [source ip] [wildcard] [ACL]

By: errtime

errtime — Thu, 13 May 2010 18:59:04 +0000

Colby, in this case u can indeed set the AD for particular route lower or higher, like MrPaul said.
It is doable just like in EIGRP and OSPF.
distance

By: Colby

Colby — Thu, 13 May 2010 17:44:10 +0000

Ah. Well still, use BGP.