From: Peter van Oene (pvo@xxxxxxxxxxxx)
Date: Fri Jan 04 2002 - 13:45:53 GMT-3
comments inline
At 10:57 AM 1/4/2002 -0500, John Neiberger wrote:
>I seem to recall a post just within the last couple of weeks
>about this. IIRC, an L1/L2 router will not advertise a default
>into its area unless you're have clns routing enabled. This is
>because without clns turned on the router doesn't understand
>the ATT bit and ignores it.
This should not be the case and indeed would deviate from the spec
>By default, an L1/L2 router that is connected to multiple areas
>will advertise a default into its own area, which is simply an
>advertisement with the ATT bit set.
A multi-area router will have one ISIS process for each area it resides
in. Hence, "it's" refers to all areas it is connected to. It will set the
ATT bit if it meets the criteria for doing so (L2 connectivity etc)
>Perhaps that is why your research shows multia-area IS-IS
>configurations with clns routing turned on. I'm a little fuzzy
>on the details since I'm not an IS-IS guru by any means.
>Hopefully, someone will correct me on the details if I'm wrong.
Still holding out that the configs he is looking at are indeed clns routing
configs, not pure IP configs :)
>Regards,
>John
>
>---- On Fri, 4 Jan 2002, Michael C. Popovich
>(mpopovich@layer3.biz) wrote:
>
> > I have double checked on Documentation CD regarding IS-IS and
>the need
> > for CLNS. Peter is definitely right in the fact that CLNS is
>not
> > required to route IP using IS-IS. This question is for Peter
>and anyone
> > else with a good understanding of IS-IS.
> >
> > Reading through the Documentation CD on Integrated IS-IS I
>have a
> > question regarding multi-area. The way I read it I am
>assuming that if
> > you implement a multi-area IS-IS solution then you in fact do
>need to
> > enable CLNS routing. Is this true? The examples given in the
> > Documentation CD show that a single area IS-IS network
>doesn't need CLNS
> > routing but in the multi-area scenario they have CLNS routing
>enabled.
> > This isn't specifically addressed but I assume with the need
>for
> > different areas using different NET addresses requires the
>CLNS
> > protocol.
> >
> > Please correct me if I have misinterpreted this.
> >
> > Thanks,
> >
> > Michael Popovich
> >
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