From: Stephens, Paul [Prof.Serv] (Paul.Andrew.Stephens@xxxxxxxxxx)
Date: Tue Aug 22 2000 - 16:10:06 GMT-3
your rid will always be the loopback with the highest ip address, if you
have a loopback on the router. if you don't have a loopback then it will be
the highest ip address
scenario 1 no loopback
if you add a new ip address to an interface after starting ospf, which is
higher than all the others, nothing will change until you do a reload. after
a reload the rid will change to the highest ip address
scenario 2 with loopback
if you add a new ip address to an interface nothing will change before or
after a reload because you have a loopback. if you add a new loopback with a
higher address nothing will change until you do a reload. after the reload
the rid will be the new loopback address
remember this because if you have a virtual link it terminates on the rid so
changing the rid can cause problems
I hope you can understand that, it's not easy trying to explain over an
e-mail, the best thing to do is try in a lab
Cheers
Paul Stephens
UK INI Network Consultant
Networks and Systems Integration Services
Compaq Computer Ltd
paul.andrew.stephens@compaq.com
Tel: (Mobile) +44 (0)7818 457948
www.compaq.co.uk
-----Original Message-----
From: Sam Munzani [mailto:sam@chinet.com]
Sent: Tuesday, August 22, 2000 19:35
To: Tony Medeiros
Cc: peter brown; ccielab@groupstudy.com
Subject: Re: Loopback & OSPF
I understand that. What would you do if lab instructions specifies not to
use any loopback interfaces unless specified. What happens after reboot?
On Tue, 22 Aug 2000, Tony Medeiros wrote:
> Nope, It doesn't need to in the OSPF process. It just needs to be in an
> "up" and "up" condition. OSPF picks the highest "active" interface to be
> the router ID. If you configure a higher address later it won't change
the
> router ID however unless you restart OSPR neighbor negotiation, i.e.
reload
> or shut/no shut the interfaces. This isn't a big deal unless you've
> configured virtual links with use router ID's as anchor points.
> Take care,
> Tony Medeiros
>
> ----- Original Message -----
> From: "peter brown" <pita40@hotmail.com>
> To: <ccielab@groupstudy.com>
> Sent: Tuesday, August 22, 2000 6:02 AM
> Subject: Loopback & OSPF
>
>
> > If I have loopback int. for router id in ospf, do I need to add that
int.
> > to an area. Is it necessary to add a network statement for that
loopback
> > int. address?
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:24:28 GMT-3