RE: bgp question...help

From: Janto Cin (jantocin@datacomm.co.id)
Date: Mon Nov 04 2002 - 07:43:47 GMT-3

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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This archive was generated by hypermail 2.1.4 : Tue Dec 03 2002 - 07:22:52 GMT-3