From: Scott Morris (swm@emanon.com)
Date: Sun Aug 08 2004 - 11:41:52 GMT-3
Actually, the default route is not "sent" at all. The ATT bit indicates
connection to an outside area. As soon as L1 routers see routes with the
ATT bit set, they will create a default route pointing to the router that
sent the ATT-bit routes.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
JNCIP, et al.
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of john
matijevic
Sent: Sunday, August 08, 2004 9:54 AM
To: k_kaloianov@eircom.net; ccielab@groupstudy.com
Subject: RE: isis and ATT bit=1
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
:)
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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