thanks for all your help
"Howard C. Berkowitz" <[EMAIL PROTECTED]> wrote in message
news:p05001902b669209cb2e1@[63.216.127.98]...
> >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,
>
> int loop 0 int loop 1 int loop 2
> ip addr 1.2.3.4 ip addr 5.6.7.8 ip addr 2.3.4.6
>
> The router ID, in this case, was 5.6.7.8.
>
> If there is only a single loopback interface, its IP address will
> always be the router ID:
>
> int loop 0 int ser 0 int ser 1
> ip addr 1.2.3.4 ip addr 5.6.7.8 ip addr 2.3.4.6
>
> Here, the router ID would be 1.2.3.4.
>
> If there were no loopback interfaces, the numerically highest active
> interface would be used:
>
> int eth 0 int ser 0 int ser 1
> ip addr 1.2.3.4 ip addr 5.6.7.8 ip addr 2.3.4.6
> no shutdown shutdown no shutdown
>
> 2.3.4.6 would be the router ID.
>
>
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