From: ccie2be (ccie2be@nyc.rr.com)
Date: Sat Oct 25 2003 - 20:39:36 GMT-3
Hi,
Two level2 IS-IS routers don't need to be in the same area - that's the
nature of a level 2 router. By default, when you enable the IS-IS process
on a cisco router, it's both a level 1 and level 2 router. If you specify
that the router should only be Level 2, then all interfaces will only send
out L2 Hello's & form adjacencies with only other L2 routers, therefore
there is no need to specify that a particular interface should only send L2
hello's with the circuit-type command. The same is true is you specify that
the router is only L1 - only L1 hello's and adjacencies will be formed on
any IS-IS enabled interfaces. The only time using the circuit-type command
makes sense is if the router is both a L1 and L2 router which is the
default. In this case, it makes sense to use the circuit-type command when
directly connected routers are running either just L1 or just L2.
HTH, dt
----- Original Message -----
From: <Vazman@aol.com>
To: <ccielab@groupstudy.com>
Sent: Saturday, October 25, 2003 6:40 PM
Subject: ISIS question
> If two routers need to run ISIS and only use Level 2 -
>
> Should we put the routers in the same area and change the is-type to level
2
> / circuit-type 2 or just put them in different areas. Both seem to work.
>
> Thanks
>
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