Path Selection

The metric that is used is stated as cost, although many vendors supply a default that may be overridden manually. This is true of Cisco's implementation of OSPF, which uses bandwidth and delay as its default.

Examples of link-state routing protocols for IP are OSPF and IS-IS.

Another distinction that needs to be made between routing protocols is the difference between interior and exterior protocols. Interior protocols are those that update routers within an organization. Exterior protocols are those that update routers that connect different organizations to each other or to the Internet.

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