From: Tony Medeiros (tonygreat@xxxxxxxx)
Date: Tue Aug 22 2000 - 19:44:03 GMT-3
Thanks, I forgot about the loopback rule, The "ospf network
point-to-point" command is not on all versions of IOS. I remember trying
this before on 11.2 or something and it didn't work. I'll try it again on
some newer code.
Thanks again
Tony Medeiros
----- Original Message -----
From: "Brian Hescock" <bhescock@cisco.com>
To: "Tony Medeiros" <tonygreat@home.com>
Cc: "peter brown" <pita40@hotmail.com>; <ccielab@groupstudy.com>
Sent: Tuesday, August 22, 2000 7:48 AM
Subject: Re: Loopback & OSPF
> Tony,
> Actually, it isn't necessarily the highest ip address, in fact, it
> usually isn't because most people use loopback interfaces. Example:
>
> int e 0
> ip add 200.200.200.1 255.255.255.0
>
> int loop 0
> ip add 135.89.1.1 255.255.255.252
>
> The router id would be 135.89.1.1 (at least after you clear the
> process) because it goes by the highest ip address in the router, unless a
> loopback is used. If a loopback is used, it goes by the loopback with the
> highest ip address. BTW, you can also now manually set the router-id
> with the router-id command (don't know which version, sorry).
>
> Someone also mentioned the loopback will always be advertised as a /32 no
> mater what the mask is on the interface. You can change this so it
> advertises the actual mask by using "ip ospf network point-to-point" under
> your loopback interface(s).
>
> Brian
>
> 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?
> > >
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