From: David Hurtado (dei2viccie@hotmail.com)
Date: Sun Apr 04 2004 - 10:12:26 GMT-3
OK, now i think i know what's going on:
I have introduced "passive-interface loop 0" in the IS-IS routing process:
router isis TODOS
net 49.2490.0001.0001.0006.00
net 49.0001.0001.0001.0006.00
log-adjacency-changes
passive-interface Loopback0
So R6 (Level-1-2 router) announced to BB1 (Level-1 router) only the route to
the loopback, not the default route.
If i take off the "passive-interface" command and reload, then the default
route appears in the Level-1 router.
This is what i deduce:
- If the Level-1-2 router doesn't introduce any kind of route in Level-1
area, then it will introduce a default route.
- If the Level-1-2 router does introduce some route in Level-1 area, then it
will NOT introduce a default route.
Am i wrong? Please tell me if my deductions are rigth, please.
Thanks a lot for all your attention and help
>From: "David Hurtado" <dei2viccie@hotmail.com>
>Reply-To: "David Hurtado" <dei2viccie@hotmail.com>
>To: yuchunyan@hotmail.com, ccielab@groupstudy.com, mickdcsw@charter.net
>Subject: RE: Strange route leaking situation
>Date: Sun, 04 Apr 2004 14:55:01 +0200
>
>Hello,
>Althouth some of you gave me an answer about this topic, I have to go back
>over it.
>
>Today i'm working over the same configurations as on Friday. Before, the
>Level-1-2 router (R6) introduced a default route to the Level-1 router
>(BB1). You told me that this is the default behaviour of a Level-1-2
>router. Now it doesn't introduce any default route at all. WHY?
>
>Did somebody suffer something similar any time?
>
>I don't understand it. Could somebody help me please? i'm getting crazy
>with all this stuff.
>
>Thanks a lot
>
>
>
>
>
>>From: "yu chunyan" <yuchunyan@hotmail.com>
>>To: dei2viccie@hotmail.com
>>Subject: RE: Strange route leaking situation
>>Date: Sat, 03 Apr 2004 12:26:12 +0800
>>
>>Even R6 doesnot receive default route from L2 neighbors, it still
>>distribute a default route to BB1. This is default action for L1/2 router.
>>
>>Bin
>>
>>
>>>From: "David Hurtado" <dei2viccie@hotmail.com>
>>>Reply-To: "David Hurtado" <dei2viccie@hotmail.com>
>>>To: ccielab@groupstudy.com
>>>Subject: Strange route leaking situation
>>>Date: Fri, 02 Apr 2004 20:53:59 +0200
>>>
>>>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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>>
>
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