From: Roman Rodichev (rodic000@xxxxxxxxxxx)
Date: Sun Jun 10 2001 - 18:47:19 GMT-3
Dave, sometimes you have other external routes in OSPF that you want to send
back into BGP (like exIGRP routes), but you want to filter exBGP routes. I
usually use tags for that.
And you are talking about "match external 1 external 2", correct? Yes you
are right, you need to use this option to redistribute Type 5 OSPF routes
into other protocols. But be careful! If you use route-map in your
redistribution command, you automatically activate "match external 1
external 2" option
(I will forward this message back to groupstudy, someone might need this)
>From: David Ankers <d.ankers@chello.nl>
>To: "Roman Rodichev" <rodic000@hotmail.com>
>Subject: Re: route tagging
>Date: Sun, 10 Jun 2001 23:40:28 +0200
>
>If you redist ospf in to BGP the external routes type ex1 & 2 will never
>get
>redistributed. If that's what you are talking about? Route tagging is a
>great
>feature and has its place, certainly makes filtering easy in some places.
>
>
>On Sunday 10 June 2001 22:47, you wrote:
> > I was going to ask this question long time ago, but I keep forgetting.
>Is
> > anybody using route tagging to prevent routing loops? Like when you have
>3
> > BGP autonomous systems, the middle one runs OSPF, and you want to
>prevent
> > exBGP routes to get redistributed back into BGP. I'm so used to using
>route
> > tagging, and I think I will do that in the lab too (instead of matching
>ip
> > address and maintaning growing access-lists).
> >
> > What is your opinion on this?
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