RE: bgp question...help

From: Sara Li (saralilin@hotmail.com)
Date: Mon Nov 04 2002 - 09:06:35 GMT-3

Janto,
 your solution .. . hummm, i tried simplified it.

R1(AS100)-----R2(AS300)-----R3(AS300)------R4(AS200)

R1 has route 172.16.1.0/24 in its BGP table.
R4 has route 192.168.1.0/24 in its BGP table.

R2
-----
neighbor R1 route-map setcommunity in

route-map setcommunity permit 10
set community no-export

R3 

----
neighbor R4 route-map setcommunity in

route-map setcommunity permit 10
set community no-export

i think this will work. so whatever routes from ebgp neighbor are tag
with no-export, so the routes will not exit as300.

am i right?

>From: "Janto Cin" >Reply-To: "Janto Cin" >To: "'Sara Li'" , >Subject:
RE: bgp question...help >Date: Mon, 4 Nov 2002 17:43:47 +0700 >
>R1(AS100)-----R2(AS300)-----R3(AS300)------R4(AS200) > >R1 has route
172.16.1.0/24 in its BGP table. >R4 has route 192.168.1.0/24 in its BGP
table. > >R2 >----- >neighbor R1 route-map setcommunity in >neighbor R1
route-map deny_as200 out > >route-map setcommunity permit 10 >match ip
address 1 >set community 100 > >route-map setcommunity permit 20 >
>access-list 1 permit 172.16.1.0 >ip community-list 99 permit 200 >
>route-map deny_as200 deny 10 >match community-list 99 > >route-map
deny_as200 permit 20 > >R3 >---- >neighbor R4 route-map setcommunity in
>neighbor R4 route-map deny_as100 out > >route-map setcommunity permit 10
>match ip address 1 >set community 200 > >route-map setcommunity permit
20 > >access-list 1 permit 192.168.1.0 >ip community-list 99 permit 100 >
>route-map deny_as100 deny 10 >match community-list 99 > >route-map
deny_as100 permit 20 > >Please correct me if I'm wrong. > >Janto > >
>-----Original Message----- >From: nobody@groupstudy.com
[mailto:nobody@groupstudy.com] On Behalf Of >Sara Li >Sent: Monday,
November 04, 2002 3:25 PM >To: ccielab@groupstudy.com >Subject: bgp
question...help > >i have confederation AS 300 peer with AS100, AS 200.
>AS 300 got 3 sub-as 65501,65502,65503. and i dont want AS 300 to be a
>trasit as for AS100 and AS 200. >how should i filter it? initially i
thougt using as-path filter to allow >only ^$ local as, then it proves
only local sub-as routes will go out, >not allow the other two sub as go
out of AS 300. then i thoght of using >community no-export. but then, if
as100 or as 200 neighbor as want to >reach as 300, they cant as AS 100 or
AS 200 wont advertise as 300's >routes.any idea? Sara >
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