Hello Mike and Bradley,
My mistake, R5 is not in AS300, that should be R4, so I'm asking the
possibility, how can I configure on R1 (which advertise 10.1.1.0) to send
community with community 100:10, and then R4 in AS300 will prepend the
network that is coming with 100:10 community (which is 10.1.1.0) from AS100
, and prepend it with 1000 2000 3000 (so AS200 will chose R2 (As100) rather
than AS300 to go to 10.1.1.0
Thanks,
grad
>From: "Bradley J. Wilson"
>Reply-To: "Bradley J. Wilson"
>To: [EMAIL PROTECTED]
>Subject: Re: BGP Community queries [7:9616]
>Date: Sat, 23 Jun 2001 08:46:46 -0400
>
>I'm not quite clear on what you're trying to accomplish here.
>
>Since R1 doesn't have any external neighbors, I don't think you'd configure
>it to set any community strings. R5 is not in AS300, and therefore can't
>force the routers in AS300 to prepend anything. It looks like you're
>trying
>to force the traffic to 10.1.1.0 (/24?) through either AS200 or AS300, but
>again I'm not clear. Are you trying to set a community string, or prepend
>an as-path?
>
>From: "Mike"
>To: "\"Grad Alfons Kanon\""
>Subject: Re: BGP Community queries [7:9616]
>Date: Sat, 23 Jun 2001 14:49:19 -0400
>
>It seems to me that you are trying to force traffic from AS 300 destined to
>10.1.1.0/24 through AS 200, rather then directly to AS 100. If this is
>correct you really don't need to do anything on R5. The following will
>accomplish this:
>
>
>//Assume R3 is neighor 3.3.3.3 for R1://
>
>route-map pre-pend permit 10
> match ip address prefix-list pre-pend
> set community 100:10
>!
>!
>route-map pre-pend permit 20
> match ip address
>!
>!
>ip prefix-list pre-pend seq 10 permit 10.1.1.0/24
>access-list 1 permit any
>!
>!
>//In your router bgp section//
>neighbor 3.3.3.3 route-map pre-pend out
>!
>
>
>Assume R4 is neighbor IP address 4.4.4.4 for R3
>Assume R3 is neighbor IP address 33.33.33.33 for R4
>route-map pre-pend permit 10
> match community 10:100
> set as-path prepend 1000 2000 3000
>!
>!
>route-map pre-pend permit 20
> match ip address
>!
>!
>ip prefix-list pre-pend seq 10 permit 10.1.1.0/24
>access-list 1 permit any
>
>//In your router bgp section//
>neighbor 33.33.33.33 route-map pre-pend in
>
>
>----- Original Message -----
>From: ""Grad Alfons Kanon""
>Newsgroups: groupstudy.cisco
>Sent: Saturday, June 23, 2001 3:04 AM
>Subject: BGP Community queries [7:9616]
>
>
> > Dear All, need help:
> >
> > Given:
> > ======
> > As 100 = R1, R2, R3
> > AS 200 = R5
> > AS 300 = R4
> >
> > Physical connection:
> >
> > R3 has three connection: R1, R2 and R4
> > R2 has two : R5 and R3
> > R4 has two: R3 and R5
> >
> >
> >
> > R1 to R2 with IBGP
> > R3 to R4 with EBGP
> > R3 to R2 with IBGP
> > R2 to R5 with EBGP
> > R4 and R5 with EBGP
> > R3 is route reflector
> > R1 will advertise 10.1.1.0
> >
> > Question:
> > How can Iconfigure R1 and R5 so,
> > AS300 will prepend with 1000 2000 3000 for network 10.1.1.0 with
>community
> > 100:10 that coming from AS100..?
> >
> >
> > tx,
> >
> > Grad
> >
> >
> >
> >
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