"Howard C. Berkowitz" wrote:
>
> >Hi everybody:
> >I am study BSCN,there are something confused me:
> >in the book they says:The highest IP address on an active interface is
> >normally used as the router ID, but this can be overridden by configuring an
> >IP address on a loopback interface.
> >I want to know which will be the Router ID if the loopback IP address
> >smaller than the active interface IP address?
> >Any suggestion will be appreciate,thanks.
> >
> >Will Guan
> >frome Peking, China
>
> If there are multiple loopback, the router ID will be the numerically
> highest IP address on any loopback. In other words,
[snip]
And the part that some folks forget is that once a router ID is active,
it will not change if another interface is made active, or the IP of
another interface is changed to a higher value. The rationale is
stability, since all other routers in the area are tracking this one
by its present router ID. The same principle applies to the DR election
-- there is no coup option.
Now if you were to shut down the interface with the existing router ID...
Marty Adkins Email: [EMAIL PROTECTED]
Mentor Technologies Phone: 410-280-8840 x3006
275 West Street, Plaza 70 WWW: http://www.mentortech.com
Annapolis, MD 21401 Cisco CCIE #1289
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