From: kasturi cisco (kasturi_cisco@hotmail.com)
Date: Wed Oct 15 2003 - 11:25:28 GMT-3
Ken,
I think both will work and wont be an issue as long as u go with the
requirements.I prefer the first one.
But when using BGP and route-maps for route-filtering like this use the
Extened ACL for cases like permit the summary and some specifics or other
way round. May be in this case it the router has just a /16 and not
others ELSE it wont work with std ACLs.
Correct me if needed.
Good Luck,
Kasturi.
>From: Ken.Farrington@barclayscapital.com >Reply-To:
Ken.Farrington@barclayscapital.com >To: ccielab@groupstudy.com >Subject:
BGP Route-Map Question. >Date: Wed, 15 Oct 2003 12:14:12 +0100 >
>+--------------+ >| AS1 | >| +----+ | >| | R2 | | >| +----+ | >| | | >|
| | >| | | >| +----+ | >| | R1 | | >| +----+ | >| | | >+------|-------+ >
| >+------|--------+ >| +----+ | >| | R3 | | >| +----+ | >| AS2 |
>+---------------+ > > >Simple BGP Scenario/ > >I have multiple routes
being asvertised via BGP from R2 throught the ASs >I want to summarise
the routes to one single route on R1 so it advertises >as summary to R3
in AS2. > >I also, want to stop this summary from being advertised back
into AS1. >I can do this with a neighbor route map, but which route-map
is correct. > >They both work, and I am panicing becuase what they may
ask in the lab, I >may do >one way and they expect another. > > >Many thx
in advanced for any tips >Ken > > >! >router bgp 620 > no synchronization
> bgp log-neighbor-changes > bgp confederation identifier 600 >
aggregate-address 142.220.0.0 255.255.0.0 summary-only > neighbor
22.22.22.22 remote-as 620 > neighbor 22.22.22.22 ebgp-multihop 255 >
neighbor 22.22.22.22 update-source Loopback0 > neighbor 22.22.22.22
route-map NO-SUMMARY out > neighbor 33.33.33.33 remote-as 500 > neighbor
33.33.33.33 ebgp-multihop 255 > neighbor 33.33.33.33 update-source
Loopback0 >! >access-list 18 permit 142.220.0.0 >! >route-map NO-SUMMARY
deny 10 > match ip address 18 >! >route-map NO-SUMMARY permit 20 > >
>----------------or--------------------- > >access-list 18 deny
142.220.0.0 >access-list 18 permit any > >! >route-map DENY-SUMM permit
10 > match ip address 18 >! > > >
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