[52596] in North American Network Operators' Group
RE: iBGP next hop and multi-access media
daemon@ATHENA.MIT.EDU (Martin, Christian)
Sun Oct 6 23:42:51 2002
From: "Martin, Christian" <cmartin@gnilink.net>
To: 'Ralph Doncaster' <ralph@istop.com>
Cc: nanog@merit.edu
Date: Sun, 6 Oct 2002 23:42:25 -0400
Errors-To: owner-nanog-outgoing@merit.edu
Ralph,
What you are asking for is dynamic routing protocol to be able to tell you
how to do something locally scoped. This is why we have redirects on
ethernets. But, since you must do this with BGP, try this... (I haven't)
router bgp x
neighbor 10.10.10.2 remote-as x
neighbor 10.10.10.2 route-map foofoo in
!
route-map foofoo permit 1
match ip address 1
set interface e1
!
access-list 1 permit 172.16.16.0
-chris
> -----Original Message-----
> From: Ralph Doncaster [mailto:ralph@istop.com]
> Sent: Sunday, October 06, 2002 9:06 PM
> To: E.B. Dreger
> Cc: nanog@merit.edu
> Subject: Re: iBGP next hop and multi-access media
>
>
>
> > RD> When I setup a situation like the above, with Router B
> advertising
> > RD> the 172.16.16.0/24 to router A, router A sees a next hop of
> > RD> 10.10.10.2. This is not good since packets from A going to the
> > RD> 172.16.16 subnet get sent to Router B, which then ARPs the
> > RD> desitnation, instead of just being ARPed by router A.
> >
> > Is this what you're trying to do:
> >
> > route-map <foo>
> > match <whatever>
> > set ip next-hop <something>
>
> Not really, what I want is router A to learn that ther is no
> next hop IP- the subnet is on the local ethernet.
>
> -Ralph
>
