Exterior Gateway Protocol
EGP is a standard protocol. It is used mainly for the data that needs to be sent outside of the network.
The Exterior Gateway Protocol is the protocol used for exchange of routing information between exterior gateways .

The EGP only provide the next information to the networks from inside. This information is collected by the gateways , using Interior Gateway Protocol (IGP), that is used to exchange information between the gateways
EGP is totally based on the polling kind of technique. You can exchange messages , to monitor and see your neighbour reachability and the poll request for response.
EGP restricts exterior gateways by allowing them to advertise only those destination networks reachable entirely within that gateway's autonomous system.
Thus, an exterior gateway using EGP passes along information to its EGP neighbors but does not advertise reachability information about its EGP neighbors outside the autonomous system. It has three main features:
- It is like a network acquiring protocol. The gateways are regarded as neighbours thorugh the internet . To become a neighbour a message is sent to the network .This step is necessary to obtain routing information from another gateway.
- It supports a neighbor reachability protocol. It is used by a gateway to keep real-time information as to the reachability of its neighbors.
- It supports the updation of the messages that carry routing information. No gateway is required to send NR messages to any other gateway, except as a response to a poll request.
0 Comment(s)