Subject: RE: [Isis-wg] (no subject)

From: "Metz, E.T." <[email-masked]>
Date: Mon, 29 Jan 2001 14:05:54 +0100

A small note on this:
- An ISIS router always resides entirely in an area, unlike OSPF where
interfaces of a router reside in an area. The area of which it is member is
determined by the router's system id.
- An ISIS router can be part of multiple areas.

A L1/L2 router in ISIS is part of one area, but exchanges L2 (backbone)
routes with other L1/L2 (or pure L2) routers part of other areas -if
connected to them-. There is no  such thing as a distinct backbone area
(like area 0 in OSPF) in ISIS. Instead the backbone is formed by a
contigious set of L1/L2 routers.

cheers,
	Eduard

> -----Original Message-----
> From: Chris Flores [mailto:[email-masked]]
> Sent: donderdag 25 januari 2001 22:45
> To: [email-masked]'; [email-masked]
> Subject: RE: [Isis-wg] (no subject)
> 
> 
> Volkan - 
> 
> A router that implements the is-is protocol can be configured to be:
> 
> 1. a level-1 is
> 2. a level-2 is or a
> 3. a level-1-2 is (area border router)
> 
> Therefore, individual interfaces can be configured to have level-1 or
> level-2 metrics depending on the is type. 
> 
> I hope this helps.
> 
> Best regards.
> 
> /cf
> 
> -----Original Message-----
> From: Volkan Ozdemir [mailto:[email-masked]]
> Sent: Thursday, January 25, 2001 3:37 PM
> To: [email-masked]
> Subject: [Isis-wg] (no subject)
> 
> 
> 
> Hi,
> 
>   I had a basic question about IS-IS. In IS-IS is a
> router completely in a single area or is it possible to
> assign interfaces to different areas?
> 
> Thanks
> 
> Volkan
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