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An endpoint identifier (EID) is an IPv4 or IPv6 address used to identify an endpoint on the network. These EIDs help mark endpoints, normally a gateway or H.323 terminal, where a locator provides the information about the topological location of the endpoint. The locator giving information will not change the location of the endpoint if it changes location. This is because endpoint identification takes place using endpoint identifiers. Endpoint identifiers are specifically used in Nimrod internetworking and routing architecture.
A communication network always has some sort of limitation, boundary or endpoint. Generally, these endpoints are gateways or session initiation protocols(SIP). Endpoint identifiers are used to distinguish between these networks.
Nimrod routing architecture, for example, is a dynamically scaled internet work scheme whose purpose is to manage the flow of topological information being shared over an internetwork. Nimrod uses endpoint identifiers to define endpoints in the whole architecture.