From: iron_tri (iron_tri@msn.com)
Date: Wed Nov 12 2003 - 22:12:19 GMT-3
I took a class from Brian Dennis/Brian Mcgahan; and I believe that Brian
Dennis gave the following explanation for this redistribution scenario: The
router sees the participating ISIS routes (they are also connected routes)
on R1 as CLNS routes, not IP routes, even though you are running ISIS for
IP. Therefore, they don't get marked as IP routes in the routing database,
and they are not marked to be forwarded into another IP Routing protocol
upon redistribution because they are marked in the database as CLNS routes.
Brian?
----- Original Message -----
From: "Joe Chang" <changjoe@earthlink.net>
To: <ccielab@groupstudy.com>
Sent: Wednesday, November 12, 2003 1:58 AM
Subject: ISIS to OSPF redistribution
> This issue was raised here a few years back in the archives, but wasn't
> resolved.
>
> R1 redistributes ISIS into OSPF:
>
> router ospf 1
> redistribute isis level-1-2 subnets
>
> ISIS is configured on the local router as such:
>
> router isis
> net 49.0001.0000.0000.0001.00
> passive-interface lo0
>
> int s1/0.1
> ip router isis
> isis circuit-type level-1-2
>
> ISIS puts these two interfaces into its level-1 database. It also receives
a
> route from an ISIS neighbor, R2. (I can post up the ISIS database if any
wants
> to see it).
>
> The only ISIS route that finds its way into OSPF is the route from R2. The
> directly connected ISIS routes (the serial subinterface and loopback) do
not
> make into the OSPF external route table. In the archive, it seems to been
have
> determined that OSPF would not import routes if those same routes were
also
> directly connected. However I substitued ISIS with EIGRP and the routes
were
> successfully introduced into OSPF. RIP worked the same way ( I did not
> redistribute connected into OSPF).
>
> I also tried fiddling around with the isis circuit types, making the
serial
> subinterface a level-2 only circuit, as well as the ISIS routing as
level-2
> only, with no results.
>
> Am I missing something embarrassingly obvious? Help !
>
> Thanks,
> Joe
>
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