Robert, If you have two area 0s separated by another routing protocol, you do not have to make them one domain. They are just separate OSPF domains. I think in this lab there was about 6 "routing domains." Quite fun :)
Bryan Bartik CCIE #23707 (R&S), CCNP Sr. Support Engineer - IPexpert, Inc. URL: http://www.IPexpert.com On Fri, May 15, 2009 at 6:52 AM, Kim Pedersen <[email protected]> wrote: > Hi, > > Yeah it is. Just played around with it a bit more. Even if you remove the > network statement that assigns an interface to run the OSPF instance, the > other one wont take over until you go into that instance and do a "no > network ..." and then a "network ..." again. Then it will form an adjacency > in the other instance. > > Just one of those things i guess... > > Sincerely, > Kim > > > On Fri, May 15, 2009 at 2:41 PM, Jared Scrivener > <[email protected]>wrote: > >> I hadn’t observed that before and it seems a little odd (although I >> don’t have time to lab it up now so I’ll trust you have). >> >> >> >> I know that with OSPFv3 we should be able to run two separate processes on >> the same interface to peer with two totally separate neighbors. That’s kind >> of cool and perhaps just another reason to start deploying IPv6 ASAP. >> >> >> >> Cheers, >> >> >> >> Jared Scrivener CCIE3 #16983 (R&S, Security, SP), CISSP >> >> Sr. Technical Instructor - IPexpert, Inc. >> >> URL: http://www.IPexpert.com >> >> Telephone: +1.810.326.1444 >> >> Fax: +1.810.454.0130 >> >> Mailto: [email protected] >> >> >> >> *From:* [email protected] [mailto: >> [email protected]] *On Behalf Of *Kim Pedersen >> *Sent:* Friday, 15 May 2009 4:18 AM >> *To:* Joe Astorino >> *Cc:* [email protected]; [email protected] >> >> *Subject:* Re: [OSL | CCIE_RS] Volume 3 Lab8 Section 3.3 >> >> >> >> Hi Joe, >> >> I have no doubt that you will :) >> It seems when doing this, the interface will actually only show up in >> one of the proccesses (the first one configured) at a time. A built in >> mechanism for avoiding poor design choices i guess. >> >> Sincerely, >> Kim Pedersen >> >> On Fri, May 15, 2009 at 10:05 AM, Joe Astorino <[email protected]> >> wrote: >> >> Hi Kim, >> >> >> >> Thanks for the kind words, and we will be working hard to get you there as >> well! Regarding your OSPF situation there, I honestly never tried doing two >> OSPF processes and trying to put the same interface into area 0 in both >> processes. Clearly, as you mention there it doesn't seem to work. I don't >> know of any specific documentation to support that, but when in doubt lab it >> up, thats the right mentality. >> >> >> >> What I was trying to explain to Robert was that in the event you have two >> different area 0's in your diagram, but they are a quite a distance apart -- >> One alternative option to creating a ton of virtual links would be to just >> run one of them in a seperate OSPF process, and redistribute. This can come >> in handy particuarly when the second area 0 that is all the way on the other >> side of your network happens to also be on the edge of your OSPF domain as >> well. Now, in that case we would be running two processes, but NOT be >> running two OSPF processes on the same interface like you have here. >> >> >> >> Interesting stuff though! >> >> >> >> Regards, >> >> Joe Astorino >> CCIE #24347 (R&S) >> Sr. Support Engineer – IPexpert, Inc. >> URL: http://www.IPexpert.com <http://www.ipexpert.com/> >> >> >> >> >> >> ------------------------------ >> >> *From:* Kim Pedersen [mailto:[email protected]] >> *Sent:* Friday, May 15, 2009 1:59 AM >> *To:* Joe Astorino >> *Cc:* Robert S Wyzykowski; [email protected]; >> [email protected] >> *Subject:* Re: [OSL | CCIE_RS] Volume 3 Lab8 Section 3.3 >> >> Hi Joe, >> >> Congrats with your number!! >> >> I have tried to lab up a scenario with two ospf instances on the same >> router, mapping the same interfaces to area 0 in both. I thought i read >> somewhere that OSPFv2 doesnt have any way to differentiate this on the same >> subnet, as OSPFv3 does with a sort of instance-field. Results show that only >> one adjacency will be made: >> >> R1 <-> R2, where R1 has two instances of OSPF, both marking the link >> between R1 and R2, as being in area 0. Only instance 1 will actually show >> up, and be adjacent with from R2. Are there any documentation regarding this >> behavior? >> >> Sincerely, >> Kim Pedersen >> >> On Fri, May 15, 2009 at 7:38 AM, Joe Astorino <[email protected]> >> wrote: >> >> Hey Robert, >> >> >> >> In general, yes you CAN connect two discontiguous area 0's in OSPF but you >> are not REQUIRED to necessarily. Another option is to have seperate OSPF >> processes running, and just use redistribution. If it is a giant pain in >> the butt to connect the two area 0's you may just want to run a seperate >> process of OSPF all together on one of the routers, then just redistribute >> that process. Does that make sense? >> >> >> >> Regards, >> >> Joe Astorino >> CCIE #24347 (R&S) >> Sr. Support Engineer – IPexpert, Inc. >> URL: http://www.IPexpert.com <http://www.ipexpert.com/> >> >> >> >> >> >> ------------------------------ >> >> *From:* [email protected] [mailto: >> [email protected]] *On Behalf Of *Robert S Wyzykowski >> *Sent:* Friday, May 15, 2009 12:38 AM >> *To:* [email protected]; [email protected] >> *Subject:* [OSL | CCIE_RS] Volume 3 Lab8 Section 3.3 >> >> >> In this topology, there are two separate OSPF Domains, with separate Area >> 0s, and the proctor guide did not connect them together. I was under the >> impression if you have OSPF in different areas of the network, it was a >> requirement to make sure it was one big OSPF domain. >> >> In this lab they are separate. >> >> Any thoughts? >> >> *Error! Filename not specified.* >> >> Robert Wyzykowski >> Manager, Global Telecommunications >> IMERYS >> 30 Mansell Court East - Suite 220 >> Roswell, GA, USA >> Phone: +1 770 645 3734 >> Mobile: +1 404-434 9000 >> >> >> >> From: >> >> jmangawang <[email protected]> >> >> To: >> >> [email protected] >> >> Date: >> >> 05/14/2009 04:14 PM >> >> Subject: >> >> [OSL | CCIE_RS] Two seemingly inconsequential CCIE Lab questions >> for Joe >> >> >> ------------------------------ >> >> >> >> >> Joe, >> >> First, congratulations on getting your CCIE. I've been a fan of your >> blog ever since starting my own journey back in March and found your >> experiences match a lot of my own. Onto the questions: >> >> 1) How big is the desk area? >> 2) How big is the monitor and what is the resolution? >> >> I know these may seem dumb, but during my initial study phase, I've >> basically taken up my entire dining room table (seats 8) and use a 22" >> widescreen monitor with a really high resolution. I'd hate to get >> there only to find out that we have to use an old 14" CRT on an >> elementary school desk (I know this is not the case, but I hope you >> get the visualization). >> >> Thanks, >> >> Jason >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com >> Version: 8.5.323 / Virus Database: 270.12.29/2114 - Release Date: 05/14/09 >> 06:28:00 >> >> >> >> >> -- >> // Freedom Matters >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com >> Version: 8.5.323 / Virus Database: 270.12.29/2114 - Release Date: 05/14/09 >> 06:28:00 >> >> >> >> >> -- >> // Freedom Matters >> > > > > -- > // Freedom Matters > > --
