I would go with what works in your lab!!
seriously - try putting 11.3 on both routers, then 12.1 on both, and then
reverse the 11.3/12.1 (so 12.1 on L1 and 11.3 on L2) and see what happens.
I would imagine that you can get away with not enabling CLNS if you have
IS-IS on just a P2P link - maybe not in a multi-router environment - are you
running off loopback interfaces, or just the physicals?
I have had trouble with this in the past - albeit in a lab environment. I
am always dubious about adding default-originates to Link-State protocols,
especially in an ISP enviroment where you want a default-free environment -
messing with outbound route-maps is a pain in the arse .
I will set this up in the lab again and see if I can nail it down once and
for all.
hth
Andy
----- Original Message -----
From: "Jerry Seven"
To:
Sent: Sunday, April 29, 2001 11:08 PM
Subject: IS-IS: Default route for L1 router [7:2485]
> Hi,
>
> I have a question on case study on Doyle P.655. It says that in order to
> have a default route for IS-IS L1 router, the L1/L2 can have CLNS routing
> enabled, or have the following command:
>
> default-information originate
>
> My question is after tried this in my lab, I found even WITHOUT this
command
> L1 router still got the L1 0.0.0.0/0 created, after I checked with IS-IS
> database, L1/L2 router actually doesn't have it included in LSP, so it
seems
> that L1 router is able to parse that ATT bit and automatically create it
in
> routing table. I don't have CLNS routing enabled either. The IOS version
> on L1 router is 11.3 and on L1/L2 is 12.1.
>
> After searching on CCO, the explaination of "default-information
originate"
> command made me more confused, it says the default is only advertised in
L2
> LSPs if without a route-map, but in Doyle's case study router Brussels
uses
> this command and send it to Amsterdam which is a L1 route, which one is
> correct ...
>
> Any help is appreciated,
>
> Jerry
>
>
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