From: Jason Madsen (madsen.jason@gmail.com)
Date: Mon Feb 02 2009 - 12:15:22 ARST
what ID did you use and was it used on more than one device? was it only
when you added the ID that you got the error message?
Jason
On Mon, Feb 2, 2009 at 12:59 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
>>
>>
>>
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>>
>> _______________________________________________________________________
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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
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