From: mani poopal (mani_ccie@yahoo.com)
Date: Mon Oct 04 2004 - 21:04:05 GMT-3
Ok guys,
So to be on the safe side we should try to hard code router-id as loopback interface (loopback 0) for ospf and eigrp and not arbitary ip address(3.3.3.3) to avoid any conflicts and to avoid loss of us$1250.00. Thanks all.
Mani
Xy Le <byme88@hotmail.com> wrote:
Marvin and Brian are absolutely correct!
Take it from my real life lab exam experience regarding "duplicate Router ID
in OSPF"!!!
Let just say it almost cost me $1,250.00 plus hotel and air fare!!!!! :)
Xy
----- Original Message -----
From: "marvin greenlee"
To: "'mani poopal'" ;
Sent: Monday, October 04, 2004 9:36 AM
Subject: RE: ospf router-id [bcc][faked-from][bayes]
> Look at it from the point of view of a backbone router. If there is a
> shared backbone router that connects to multiple racks, the router will
have
> problems if the person on Rack1 chooses 1.1.1.1 for their router ID, and
the
> person on Rack2 also uses 1.1.1.1.
>
> - Marvin Greenlee, CCIE#12237
> Network Learning Inc
> marvin@ccbootcamp.com
> www.ccbootcamp.com (Cisco Training)
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
mani
> poopal
> Sent: Monday, October 04, 2004 12:25 PM
> To: Brian Dennis; ccielab@groupstudy.com
> Subject: RE: ospf router-id [bcc][faked-from][bayes]
> Importance: Low
>
> Hi Brian,
>
> Thanks for the advise. I thought we could use any ip address to hardcode
as
> a router id because we are not advertising these ip addresses by any
routing
> protocol. The hard coded router id(if it is not loopback addresses) are
> going to be used only between/among neighbors.
>
> thanks
>
> Mani
>
> Brian Dennis wrote:
> Mani,
> Since in the real lab you may interact with backbone routers
> that are shared with other candidates, select a router ID that is
> unique. 1.1.1.1, 2.2.2.2 and 3.3.3.3 may not be unique. In your home
> lab they may be unique but in the real lab, the possibly exists that you
> area sharing backbone routers and could possibly end up using the same
> router ID as someone else. To help guard against this possibility, pick
> an existing loopback address to hard code as your OSPF, EIGRP and/or BGP
> router ID or pick X.X.Y.Y where X is your rack number and Y is the
> device number (1=R1, 2=R2, etc).
>
> Plus hard coding the loopback address as the router ID is good
> habit to be in for real world implementations.
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> mani poopal
> Sent: Monday, October 04, 2004 9:48 AM
> To: OzgurG@garanti.com.tr; swm@emanon.com; ccielab@groupstudy.com
> Subject: RE: ospf router-id
>
> Hi
>
> Thanks all for your responses. After Scott's email I might hard code
> router# (eg:for R4 router id=4.4.4.4) as router-id for eigrp and ospf.
> Hi I know that we can't use 0.0.0.0(joke). Guys this forum is very good,
> so read and enjoy.
>
> Mani
>
> OzgurG@garanti.com.tr wrote:
> Except that you can not configure it 0.0.0.0 on Cisco routers.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Scott Morris
> Sent: 04 October 2004 17:14
> To: 'mani poopal'; ccielab@groupstudy.com
> Subject: RE: ospf router-id
>
> The router id is simply a 32-bit number. You may set it to anything
> your heart desires!
>
> As long as your lab doesn't require the router-id to be something in
> particular, or there is an instruction telling you not to manually set
> the router-I or anything like that, then you're cool to go!
>
> 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
> mani poopal
> Sent: Monday, October 04, 2004 2:33 AM
> To: ccielab@groupstudy.com
> Subject: ospf router-id
>
> Hi Group,
>
> Is it ok to hard code router id of a ospf router(router-id 3.3.3.3 to
> other than a non given address(assume 3.3.3.3 for R3)ie:Do we have to
> hard code the loopback ip address. If it is loopback addresss we are
> going to advertise it in to ospf and if it is non given ip address we
> are not going to advertise in to ospf. I know you can give a non given
> ip address as a router id and not to advertise it in to ospf, but is
> this ok for the lab exam.
>
> thanks
>
> Mani
>
>
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