From: Pavel Bykov (slidersv@gmail.com)
Date: Tue Feb 03 2009 - 01:23:00 ARST
Well, routerid can't exactly affect LSA type, unless there is a deeper
problem.
You said Dynamips and then 2821, so you tested on both?
On Mon, Feb 2, 2009 at 8:59 AM, ciscozest <ciscozest@gmail.com> wrote:
> I just tested with dynamips with OSPF only. Without pingable OSPF router
> ID,
> I got this error at th neighbor router.
> %OSPF-4-BADLSATYPE: Invalid lsa: Bad LSA chksum Type 1, Length 60,
> LSID /.......
>
> Not sure if this is bug with dynamips or this is the requirement. Can
> anyone
> verify this?
>
> Thanks,
>
>
>
> On Sun, Feb 1, 2009 at 8:11 AM, ciscozest <ciscozest@gmail.com> wrote:
>
> > So in case of OSPF and BGP exist on the same router, does the router ID
> > must be pingable or just a valid IPv4 address?
> >
> > Thanks.
> >
> >
> >
> >
> >
> > *From:* Narbik Kocharians [mailto:narbikk@gmail.com]
> > *Sent:* Sunday, 1 February 2009 4:26 AM
> > *To:* ciscozest
> > *Cc:* swm@emanon.com; Jared Scrivener; Jason Madsen; Cisco
> certification;
> > Cisco certification
> > *Subject:* Re: about OSPF router ID
> >
> >
> >
> > I totally agree with Scott, the OSPF router id is a 32 bit dotted decimal
> > number, it *can* be an IPv4 address, but it can also be any dotted
> decimal
> > number like "0.0.0.1" for R1 and so forth.
> >
> >
> >
> > One problem that you may run in to (In a CCIE LAB) is when you have OSPF
> > and BGP with synchronization enabled in an AS, the router that
> redistributes
> > the BGP routes into OSPF must have the same router-id configured on both
> > routing protocols (meaning OSPF and BGP router-id must be identical on
> that
> > router) and in this case *you won't* be able to use anything other than a
> > valid IP address, because BGP's router-id must be a valid IP address.
> >
> >
> >
> > Hope this helped.
> >
> > On Sat, Jan 31, 2009 at 3:57 AM, ciscozest <ciscozest@gmail.com> wrote:
> >
> > Dear Scott, Jared, Roy and Jason,
> >
> > Thank you all for the input. Really appreciate that. Have a nice weekend
> :)
> >
> >
> > -----Original Message-----
> > From: swm@emanon.com [mailto:swm@emanon.com]
> > Sent: Saturday, 31 January 2009 3:23 PM
> > To: Jared Scrivener; 'Jason Madsen'; 'ciscozest'
> > Cc: 'Cisco certification'; 'Cisco certification'
> >
> > Subject: RE: about OSPF router ID
> >
> > Actually, it not only doesn't need to be pingable, but it doesn't even
> need
> > to be a valid IPv4 address. It's simply a 32-bit number.
> >
> > If you're bored, make your router-id's 240.1.1.1, 240.1.1.2, 240.1.1.3,
> > etc. Definitely can't put that on an IP interface... Definitely can't
> ping
> > it. But it works just fine.
> >
> > Jared's got a point about name lookups, but on the other hand, if you
> > properly populate your DNS lookups you'll be good on that one!
> >
> > Real life, most people use a loopback, whatever your main management
> > interface happens to be. Just keeps things simple. But it's just a
> 32-bit
> > number, so the fact that it relates to an actual IP address is for OUR
> > benefit, not the routers'!
> >
> > Scott
> >
> >
> > ---- Message from "Jared Scrivener" <jscrivener@ipexpert.com> at
> > 2009-01-30 21:25:18 ------
> > >Whilst it is true that an OSPF Router ID doesn't have to be pingable, it
> > >generally makes life easier to use a reachable IP (normally Loopback 0).
> > >
> > >Let's say that you are asked to also turn on "ip ospf domain-lookup"
> which
> > >will translate your neighbor's Router-ID into a DNS name (which will
> > either
> > >be defined by a hosts file or received via DNS).
> > >
> > >If you do it via hosts entries and your are ALSO a DNS server then your
> > DNS
> > >clients would receive an unreachable IP address when they ping via DNS
> > name.
> > >
> > >I know that's a rare case, but given the nature of question
> > interdependency
> > >on the lab (and the evil nature of workbook vendors) I personally use L0
> > as
> > >my OSPF Router-ID (and set it manually using the "router-id" command)
> > every
> > >time unless otherwise directed.
> > >
> > >Cheers,
> > >
> > >Jared Scrivener CCIE3 #16983 (R&S, Security, SP), CISSP
> > >Technical Instructor - IPexpert, Inc.
> > >Telephone: +1.810.326.1444
> > >Fax: +1.810.454.0130
> > >Mailto: jscrivener@ipexpert.com
> > >
> > >-----Original Message-----
> > >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > >Jason Madsen
> > >Sent: Friday, 30 January 2009 9:01 PM
> > >To: ciscozest
> > >Cc: Cisco certification; Cisco certification
> > >Subject: Re: about OSPF router ID
> > >
> > >OSPF Router IDs can be any UNIQUE IPv4 address...they don't have to be
> > >addresses assigned to an interface.
> > >
> > >On Fri, Jan 30, 2009 at 6:56 PM, ciscozest <ciscozest@gmail.com> wrote:
> > >
> > >> Hi all,
> > >>
> > >>
> > >>
> > >> I read Cisco press book stated that OSPF router ID do not need to be
> > >> pingable. In this case if I use a router ID which is not assigned to
> > any
> > >> interface on that router, would this cause any issue such as OSPF
> > >> adjacency,
> > >> LSA table advertisement, etc? Has anyone do this before and can
> > enlighten
> > >> me? Thanks.
> > >>
> > >>
> > >> Blogs and organic groups at http://www.ccie.net
> > >>
> > >>
> _______________________________________________________________________
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> > >
> > >
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> > >
> > >_______________________________________________________________________
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> > >
> > >
> > >
> >
> > Internal Virus Database is out of date.
> > Checked by AVG - http://www.avg.com
> > Version: 8.0.176 / Virus Database: 270.10.10/1905 - Release Date:
> 2009/1/20
> > 14:34
> >
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
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> >
> >
> >
> >
> >
> >
> >
> >
> >
> > --
> > Narbik Kocharians
> > CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> > www.MicronicsTraining.com <http://www.micronicstraining.com/>
> > www.Net-Workbooks.com <http://www.net-workbooks.com/>
> > Sr. Technical Instructor
> >
> > No virus found in this incoming message.
> > Checked by AVG i www.avg.com
> > Version: 8.0.233 / Virus Database: 270.10.16/1926 i Release Date:
> 01/30/09
> > 17:31:00
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>
-- Pavel Bykov ---------------- Don't forget to help stopping the braindumps, use of which reduces value of your certifications. Sign the petition at http://www.stopbraindumps.com/Blogs and organic groups at http://www.ccie.net
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