What is numbered interface?

By definition, a numbered interface is an interface which has a specific IP address assigned to it with a fixed subnet mask.

For example:

Interface atm0/0/0.132 point-to-point ip address 192.168.1.1 255.255.255.252

As shown in this example, when RBE is deployed with a numbered interface, there should be a separate subnet for each subscriber.

The host at the subscriber end should be configured for 192.168.1.2.

There is only one host at the subscriber end.

If the requirement is to support more than one host, the subnet mask chosen should accommodate more hosts.

Numbered interfaces give the NAP control over the number of hosts the subscriber has connected behind the CPE.

As explained above, this lack of control was a major problem in RFC1483 bridging architecture.

Hope this helps.

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