From: Peter van Oene (pvo@usermail.com)
Date: Wed Aug 11 2004 - 09:33:54 GMT-3
At 09:54 AM 8/8/2004, john matijevic wrote:
>Hello Kaloyan,
>What you are seeing is normal behavior with IS-IS, basically it treats
>each level-1 router as a stub area. It will send a default route to a
>level-1 area. IF you have a level-1-2 domain you can configure route
>leaking so that the individual routes will show up with the default. For
>more information on that see the following link:
>http://www.cisco.com/en/US/tech/tk365/tk381/technologies_tech_note09186a
>0080093f39.shtml
>:)
A quick clarification. ISIS routers (L1L2 that is) do not advertise default (by default). They set the ATT bit and L1 routers locally set a default route. Its a subtlety, but relevant.
>Sincerely,
>John Matijevic, CCIE #13254, MCSE, CNE, CCEA
>Network Consultant
>Hablo Espanol
>305-321-6232
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>k_kaloianov@eircom.net
>Sent: Sunday, August 08, 2004 7:06 AM
>To: ccielab@groupstudy.com
>Subject: isis and ATT bit=1
>
>Hi Group,
>
>just a dumb question about isis and IOS ver 12.2, I'm just having two
>areas and one router in one area and two in the other one, the two
>routers are L1 and L1/L2 and the other one is L2 or L2/L1, I just want
>to know whether we have to use clns router isis command on L2/L1
>iterface connecting /w L1 router or alternatively default-information
>originate and default static route to null interface in order to
>propagate default route to L1 router? The behaviour that I saw was that
>even without any of the above configuration there was a default route
>created in L1 routing table? Thanks in advance:)
>
>Reg,
>
>Kaloyan-:)
>
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