From: jsung7 (jsung7@yahoo.com)
Date: Mon Oct 04 2004 - 17:53:44 GMT-3
Hi Mani,
All interface IP addresses are candidates of Router
ID. But, the Loopback IP addresses will be inspected
prior to other interface IPs.
Since the Loopback IP can be specified at will, if we
plan well, we can use one of the Loopback IPs as the
id of our router. And, we don't need to manually
configure the Router ID.
What do you think?
jsung7
--- 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" <marvin@ccbootcamp.com>
> To: "'mani poopal'" <mani_ccie@yahoo.com>;
> <ccielab@groupstudy.com>
> 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 <bdennis@internetworkexpert.com>
> 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
> >
> >
> > B.ENG,A+,CCNA,CCNP,CCNP-VOICE, CSS1,CNA,MCSE
> > (416)431 9929
> > MANI_CCIE@YAHOO.COM
> >
> > ---------------------------------
> > Do you Yahoo!?
> > Yahoo! Mail Address AutoComplete - You start. We
> finish.
> >
> >
>
This archive was generated by hypermail 2.1.4 : Sat Nov 06 2004 - 17:11:42 GMT-3