From: John Neiberger (neiby@xxxxxxxxxx)
Date: Fri Jan 04 2002 - 12:57:53 GMT-3
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.
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.
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.
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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