From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Fri Apr 02 2004 - 16:04:52 GMT-3
David,
Which lab is this in?
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> David Hurtado
> Sent: Friday, April 02, 2004 12:54 PM
> To: ccielab@groupstudy.com
> Subject: Strange route leaking situation
>
> Helo everybody,
>
> I thougth that i have understood IS-IS route leaking and when it's
needed,
> but a have found a suprising situation that i cannot explain:
>
>
> (BB1)ATM0/0.201-------------------------- Dialer6 (R6)
> Ethernet2/0--------------------Level-2 routers
> Level 1 router Level 1/2 router
>
>
>
> R6 connects to a Level-1 router (BB1) thru Dialer 6 and to a group of
> Level-2 routers thru the Ethernet 2/0. R6 receives a Level-2 default
route
> from the group of Level-2 routers:
>
>
> interface Ethernet2/0
> ip router isis TODOS
> isis circuit-type level-2-only
>
>
> interface Dialer6
> ip address 54.1.8.6 255.255.255.0
> ip router isis TODOS
> isis circuit-type level-1
>
>
> router isis TODOS
> net 49.2490.0001.0001.0006.00
> net 49.0001.0001.0001.0006.00
>
>
>
> R6#sh ip route
> <snip>
> i*L2 0.0.0.0/0 [115/20] via 204.12.1.3, Ethernet2/0
>
>
>
> BB1 connects to R6 thru a Level-1 association and receives the default
> route
> as Level-1!!!!!!!:
>
>
> interface ATM2/0
> no ip address
> no atm ilmi-keepalive
> pvc 0/5 qsaal
> !
> pvc 0/16 ilmi
> !
> interface ATM2/0.301 point-to-point
> pvc 1/301
> protocol ppp Virtual-Template11
> !
> interface Virtual-Template11
> ip router isis 1
>
> router isis 1
> is-type level-1
>
>
> BB1#s ip route
> <snip>
> i*L1 0.0.0.0/0 [115/10] via 54.1.8.6, Virtual-Access3.1
>
>
> The default route is the only Level-2 route that R6 passes to BB1.
>
> From what i know about IS-IS, by default a Level-1/2 router (R6)
doesn4t
> pass Level-2 routes to a Level-1 router (BB1). You need route leaking
to
> pass Level-2 routes to a Level-1 area.
>
> Could somebody tell why it works in this way?
>
> If you want more debugs or shows, just tell me.
>
> Thanks for the help
>
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