From: Peter van Oene (pvo@usermail.com)
Date: Sun Apr 04 2004 - 13:31:34 GMT-3
At 09:12 AM 4/4/2004, David Hurtado wrote:
>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.
Level 1/2 routers never introduce a default (ie put one in a 128 or 135
TLV) unless you redistribute one, or use a default orig type
statement. However, this router must have an active L2 adjacency for it to
set the ATT bit which will govern whether or not L1 routers set default
toward it.
>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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>
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