From: Dave Meyer (dave.meyer@db.com)
Date: Fri Dec 20 2002 - 19:01:18 GMT-3
Especially if you're running anycast RP/MSDP , its best to hard code it.
"Matthew Poole"
<matthew.poole@blueyo To: "Don" <seadon@attbi.com>, <ccielab@groupstudy.com>
nder.co.uk> cc:
Sent by: Subject: Re: OSPF Router ID
nobody@groupstudy.com
12/20/02 02:17 PM
Please respond to
"Matthew Poole"
Thanks everybody.
General consensus seems to be lock it down, so it sounds like a combination
of the two, using the router-id command as well as a loopback interface
could be the way forward - unless told otherwise.
Any more comments?
Mat.
----- Original Message -----
From: "Don" <seadon@attbi.com>
To: "Matthew Poole" <matthew.poole@blueyonder.co.uk>
Sent: Friday, December 20, 2002 6:09 PM
Subject: Re: OSPF Router ID
> Although highest loopback IP address works, it has a few potential
> problems. If you make changes to the router, adding a new loopback
sometime
> in the future, it can break a whole lot of things. Also it is very
subject
> to error, as you have to manually look at the loopbacks and choose which
one
> you think is the highest. While this is not normally a problem, it can be
> very confusing if there are a lot of loopbacks. Using router-id
eliminates
> all the problems associated with the highest loopback address changing and
> human error in deciding which is the highest address.
> Personally, I prefer to combine the two, both creating a loopback and
> setting router-id to the address of that loopback. As I understand it,
you
> can set router-id to an address that does not exist on the router, i.e.
not
> create a loopback with the address of the router-id or even set the
> router-id to the address of one of the interfaces even if loopbacks exist.
> Both of these choices make it easier to break things when changes are made
> to the network and are normally not as desirable.
> Don
>
>
> ----- Original Message -----
> From: "Matthew Poole" <matthew.poole@blueyonder.co.uk>
> To: <ccielab@groupstudy.com>
> Sent: Friday, December 20, 2002 8:09 AM
> Subject: OSPF Router ID
>
>
> > What's the preferred method for setting router ID?
> >
> > 1. Router-ID command - never seen this before today.
> >
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_r
> /
> > iprprt2/1rdospf.htm#xtocid32
> > 2. Loopback interface (highest IP).
> >
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_c
> /
> > ipcprt2/1cdospf.htm#xtocid17
> >
> > All config's I've seen prefer the second method.
> >
> > Any thoughts?
> > .
.
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