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Configuring XNS Services

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114055 Rev. A

Level 1

Bay Networks implements 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 Bay

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 Bay 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 Manual do Utilizador Página 24