From: Sara Li (saralilin@hotmail.com)
Date: Mon Nov 04 2002 - 10:16:50 GMT-3
solution 2: use as-path filter.
advertise to as 100 deny _200_
advertise to as 200 deny _100_
will this work also right?
>From: "Sara Li" >Reply-To: "Sara Li" >To: ccielab@groupstudy.com
>Subject: RE: bgp question...help >Date: Mon, 04 Nov 2002 12:06:35 +0000
> >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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This archive was generated by hypermail 2.1.4 : Tue Dec 03 2002 - 07:22:52 GMT-3