Some minor corrections.
The OSPF process will use the *highest* loopback IP
address if a loopback interface is configured.
Otherwise, it uses the *highest* IP address on a
physical interface. To configure OSPF (router ospf x)
you need a interface with IP to be in a up/up state.
You can reboot to have the router ID reflected or you
can remove the OSPF process and add it back.
--- Louie Belt <[EMAIL PROTECTED]> wrote:
> It will take the loopback address as it's ID, even
> if it is not the highest
> IP address on the router. Loopbacks take precedence
> over higher IP's with
> respect to Router ID's for OSPF. You will have to
> reboot your router for
> this change to be reflected. Once an ID is chosen,
> it will keep that ID
> regardless of changes until the router is rebooted.
>
> Louie
>
>
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of
> Ejay Hire
> Sent: Wednesday, October 18, 2000 1:50 PM
> To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
> Subject: Re: OSPF Router ID/Loopback interface
>
>
> No, It's the highest Ip on the router.
>
>
> ----Original Message Follows----
> From: "John Deatherage" <[EMAIL PROTECTED]>
> Reply-To: "John Deatherage" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Subject: OSPF Router ID/Loopback interface
> Date: Wed, 18 Oct 2000 11:15:27 -0700
>
> If I add a loopback interface to a router, when will
> the router take it as
> the router ID? Here's a scenario:
>
> Serial2/1 is the current router ID: 209.1.1.1
>
> I add Loopback0, which is 10.0.0.1
>
> Shouldn't the router take this as its router ID?
> When does this happen?
> Doing:
>
> clear ip ospf process
>
> Still shows the old router ID. Is there any way to
> force the router to take
> the ID from the loopback interface? On another
> router, I couldn't get it to
> change until after reload.
>
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