From: k_kaloianov@eircom.net
Date: Sun Aug 08 2004 - 15:42:53 GMT-3
OK, Scott,
thanks again and just a word about Jeff's book, I think that they've done excellent job and don't want to doubt any of its contents, I'd recommend it to anybody in this list.
Thanks,
Kaloyan
"Scott Morris" <swm@emanon.com> wrote:
<
< I'm pretty sure that Jeff was using those extra configs in order to push a
< 0/0 route to the other L2 router. The ATT bit handles L1 routers in your
< area, but nobody else.
<
< I don't have his book in front of me, but I feel relatively confident that
< he knows a thing or two about routing protocols. :)
<
< If it is a mistake in the book, I'm sure we'll just blame it on the editors
< anyway (grin)!!!
<
<
< 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
< k_kaloianov@eircom.net
< Sent: Sunday, August 08, 2004 11:33 AM
< To: john matijevic; 'Scott Morris'; k_kaloianov@eircom.net;
<
< ccielab@groupstudy.com
< Subject: RE: isis and ATT bit=1
<
< 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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