Re: Default OSPF redistribution behavior

From: Huan Pham (pnhuan@yahoo.com)
Date: Mon Jun 16 2008 - 07:51:40 ART

Thanks Paul,
 
It is a great point. I did not know that it is OSPF to BGP redistribution that have this default behaviour. I was refering to redistribution from OSPF to ALL other routing protocols.
 
I've been listening to CoD from a well known vendor. It is a great CoD i must say, but this must be an error. Below is what I quote from CoD.
 
"If we advertize from OSPF into other routing protocols, by default only the internal OSPF routes are really going to be redistributed. If you have a need to pull in all of the routes, on redistribute command line you use, you must use match internal external 1 external 2 parameters. Otherwise, they are just not going to come in."
 
Obvious that it's not correct, and I've unneccessarily had to put in additional parameters everytime I did redistribution from OSPF.
 
This is now no longer needed for most cases (except OSPF to BGP) after I did verification in IOS, and the gtreat feedbacks from you guys. Thanks.
 
Huan

--- On Mon, 6/16/08, Paul Cosgrove <paul.cosgrove@heanet.ie> wrote:

From: Paul Cosgrove <paul.cosgrove@heanet.ie>
Subject: Re: Default OSPF redistribution behavior
To: "Huan Pham" <Huan.Pham@peopletelecom.com.au>
Cc: "Cisco certification" <ccielab@groupstudy.com>
Date: Monday, June 16, 2008, 6:33 PM

Perhaps you are thinking of OSPF being redistributed into BGP?

Paul.

Huan Pham wrote:
> Hi GS,
>
> I used to believe that by default only INTERNAL routes are redistributed
> from OSPF to other routing protocols. To redistribute external routes,
> we have to specify them by using statement "match external 1" or
> external 2 nssa-external 1 nssa-external etc. This does not seem true
> anymore. I set up a simple scenario, and it seems all OSPF routes are
> getting redistributed.
>
> Did IOS default behaviour change in regard to OSPF redistribution?
>
> Regards,
>
> Huan
>
>
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