>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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