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Configuring DECnet Services

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308619-14.00 Rev 00

Each system in a DECnet Phase V network is assigned a Network Service Access

Point (NSAP) address. Each DECnet Phase V NSAP address must be globally

unique and can be from 10 to 20 bytes in length. However, a local DECnet

network does not need a unique address.

For more information about Phase V network organization and addressing, refer

to Chapter 1 of Configuring OSI Services.

Routing DECnet Packets Across the Network

The Nortel Networks routing software for DECnet services uses a datagram

service to route packets through the DECnet network. Routing within an area is

called Level 1 (or intra-area) routing; routing between areas is called Level 2 (or

interarea) routing.

You can configure the Nortel Networks routing software to perform either Level 1

and Level 2 routing, or to perform Level 1 Only routing.

• Use Level 1 and Level 2 routing to maintain paths to all areas within a

DECnet network.

• Use Level 1 Only routing to maintain paths to only those systems within the

router’s local area. Level 1 Only routing prevents the sending of Level 2

routing updates, thus reducing traffic on an interface.

By default, the Nortel Networks routing software for DECnet services performs

both types of routing. When the router performs both Level 1 and Level 2 routing,

you can configure each router interface as either Level 1 and Level 2, or as Level 1

Only.

When you configure the router to perform Level 1 Only routing, the router

maintains paths only to those systems within its local area. When the router

performs Level 1 Only routing, you must configure all router interfaces as Level 1

Only.

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Avaya Configuring DECnet Services Manual de usuario Pagina 20