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Configuring XNS Services

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Level 1

Nortel Networks implements Internetwork Datagram Protocol (IDP), the only

XNS Level 1 protocol. IDP determines where each internet packet goes, addresses

the source and destination of each internet packet, and selects the transmission

medium. IDP is a connectionless datagram protocol. In other words, it does not

need a channel established for delivery. Also, IDP is unreliable. Higher-level

protocols assume the responsibility for reliability.

The Level 2 services provide IDP with the information necessary to route internet

packets.

Level 2

Level 2 protocols correspond to the transport layers of the OSI model. The

Nortel Networks router running XNS software implements the following XNS

Level 2 protocols:

• Routing Information Protocol

• Error Protocol

• Echo Protocol

• Sequenced Packet Protocol

• Packet Exchange Protocol

Note that the Nortel Networks router running XNS software bridges packets other

than XNS when the bridge is configured.

XNS RIP Overview

XNS Routing Information Protocol (RIP) lets workstations and routers exchange

information dynamically to establish the route with the fewest hops and shortest

delay to each network.

Each router running XNS software maintains a RIP table, which contains the

following information about every network in the XNS network topology:

• The network address of each network

• The number of hops (cost) to that network

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Avaya Configuring XNS Services Manuel d'utilisateur Page 20