From: Nico van Niekerk (nico@vanniekerk.co.za)
Date: Mon Nov 22 2004 - 22:10:03 GMT-3
I'm also new with this, but let me try...
The 'source' is the prefix (range of prefixes) and the 'destination' is the
prefix length (range of prefix lengths).
access-list 100 permit ip 100.0.0.0 0.255.255.255 255.255.0.0 0.0.255.0
This would be similar to
prefix-list PREF permit 100.0.0.0/8 ge 16 le 24
Could anybody confirm/correct?
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Brant I. Stevens
> Sent: Tuesday, 23 November 2004 11:55 AM
> To: Joe Chang; ccielab@groupstudy.com
> Subject: Re: Redistribution of BGP into the IGP for a transit network
>
>
> Well, I hope this isn't for a real-world network; redistributing
> BGP into an
> IGP is a big no-no. :)
>
> What you specified below should be enough to get all the routes in that
> match the ACL. The fact that you are a transit doesn't really have any
> bearing on the route redistribution.
>
> You'd probably be better off with using a prefix list in lieu of
> a plain ol'
> ACL. It escapes be what the "destination" part of the ACL does in
> redistribution, but the source of permit ip host x.x.y.y will end up only
> permitting a /32 route to go from BGP into your IGP. Scott... Care to
> clarify?
>
> -Brant.
>
>
> On 11/22/2004 07:05 PM, "Joe Chang" <changjoe@earthlink.net> wrote:
>
> > Given a BGP transit network that receives routes from several
> different EBGP
> > peers, how would you redistribute the routes into the local
> IGP. Would you
> > restrict the redistribution so that a BGP route is introduced
> into the IGP at
> > only one point. For example:
> >
> > router ospf 1
> > redistribute bgp 100 route-map bgp2ospf in
> >
> > route-map bgp2ospf permit 100
> > match ip address 100
> >
> > access-list 100 permit ip host x.x.x.x host x.x.x.x
> >
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