From: k_kaloianov@eircom.net
Date: Sun Aug 08 2004 - 12:32:41 GMT-3
Thanks to both of you guys, John, Scott,
I think this clears things in my head now, your answers are exactly what I saw while playing with isis, I was a little confused cause in TCP/IP vol.1 Jeff Doyle is suggesting this two extra configs in order for default route to be propagated to L1 routers?
Reg,
Kaloyan
"john matijevic" <matijevi@bellsouth.net> wrote:
<
< Hello Scott,
< The default route is installed per Cisco doc.
< "A Level 1/Level 2 router that is attached to another area will set the
< "attached bit" in its Level 1 LSP; all the Level 1 ISs in an area will
< get a copy of this LSP and know where to forward packets to destinations
< outside the area. If the routers are running Integrated IS-IS, a default
< IP route will automatically be installed in the Level 1 routers pointing
< toward the nearest Level 1/Level 2 router that originally set the
< attached bit in its Level 1 LSP. A Level 1/Level 2 router that is not
< attached to another area can also detect that a Level 2-only neighbor is
< attached to another area and set the "attached bit" on behalf of this
< Level 2-only neighbor."
< I think the point of the question was if that using the command default
< information originate was necessary to install a default route. And if
< the default route being installed was normal behavior. I am just trying
< to help the individual. Unlike other companies, I don't focus on
< attacking other individuals. I focus on solutions. I don't have to take
< the exam. It is Kaloyan who has to take the exam. So it is important
< that he understands why the default route appears in the routing table.
< Here is the link for more information:
< http://www.cisco.com/en/US/tech/tk365/tk381/technologies_white_paper0918
< 6a00800a3e6f.shtml
< Team, if anyone else has any trouble understanding this, please let me
< know.
< :) Again im not here to debate, I don't like to see a lot of threads, im
< here to help.
< 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
< Scott Morris
< Sent: Sunday, August 08, 2004 10:42 AM
< To: 'john matijevic'; k_kaloianov@eircom.net; ccielab@groupstudy.com
< Subject: RE: isis and ATT bit=1
<
< 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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