From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Sun Oct 26 2003 - 16:20:51 GMT-3
EIGRP uses router-id's to protect against routing loops for external routes.
If a router receives an external route that has the same router-id as its
own router ID it will reject the route.
Here is a part of an earlier e-mail I sent regarding using 1.1.1.1, 2.2.2.2,
etc as router-id's:
<Quote>
In a lab environment where you might have to interact with backbone routers
that are shared with other candidates, I would recommend using a router ID
that is unique. 1.1.1.1, 2.2.2.2 and 3.3.3.3 may not be unique. In a home
lab they will be unique. In an environment with shared backbone routers and
other candidates also doing labs you 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).
</Quote>
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
matijevi@bellsouth.net
Sent: Sunday, October 26, 2003 10:28 AM
To: Brian Dennis; 'Shafi, Shahid'; ccielab@groupstudy.com
Subject: Re: OSPF router-id in real lab
Hello Brian,
I am curious as to what type of issue an eigrp router-id would solve, I
havent encountered one yet, but I know that having a router-id for ospf can
solve a virtual-link issue, I also know that having a router-id for bgp is
good for synchronization issue with ospf, so that the bgp router-id should
match the ospf router-id. Finally, when using router-ids I like to make up
my own number it doesnt have to be a loopback, I like to use 1.1.1.1 for
Router 1, 2.2.2.2 for Router 2, etc.
Sincerely,
Matijevic
----- Original Message -----
From: "Brian Dennis" <bdennis@internetworkexpert.com>
To: "'Shafi, Shahid'" <sshafi@qualcomm.com>; <ccielab@groupstudy.com>
Sent: Sunday, October 26, 2003 1:04 PM
Subject: RE: OSPF router-id in real lab
> Rack1R6(config)#router eigrp 10
> Rack1R6(config-router)#eigrp router-id ?
> A.B.C.D EIGRP Router-ID in IP address format
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Shafi, Shahid
> Sent: Sunday, October 26, 2003 9:54 AM
> To: Brian Dennis; Alec; ccielab@groupstudy.com
> Subject: RE: OSPF router-id in real lab
>
> Hi Brian,
>
> Can you router's id for EIGRP? Never did it and never thought about it??
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Brian Dennis
> Sent: Sunday, October 26, 2003 9:34 AM
> To: 'Alec'; ccielab@groupstudy.com
> Subject: RE: OSPF router-id in real lab
>
> Yes, use a loopback interface's IP address for your OSPF, BGP and to
> play it
> safe, EIGRP router-id.
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Alec
> Sent: Sunday, October 26, 2003 9:28 AM
> To: ccielab@groupstudy.com
> Subject: OSPF router-id in real lab
>
> If the lab exam does not require you to configure OSPF router-id, will
> you
> make up your own router-id using the highest loopback IP ? It will be
> easier
> to more safe for OSPF virtual link configuration. Your comments are
> welcome.
>
> alec
>
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