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DECnet Overview

308619-14.00 Rev 00

1-11

Figure 1-5. DECnet Phase IV to Phase V Address Mapping

The local Phase IV Prefix and Area fields of the Phase IV-compatible address

make up the Area Address. The Area Address identifies the area in a DECnet

network where a node resides. The High Order and DECnet IV Address fields of

the Phase IV-compatible address make up the System ID. The System ID identifies

a node within an area.

Translating Data Packets

With the DECnet IV to V Transition feature enabled, a router can always translate

a Phase IV data packet to a Phase V CLNP packet. However, there are restrictions

when a router translates a Phase V packet to a Phase IV packet:

• The packet cannot be fragmented.

• The packet must fit the Phase IV maximum transmission unit (MTU) size of

1498 bytes.

Local Phase IV

prefix

Area

High Order =

AA000400

DECnet IV

address

(byte swapped)

NSEL

Area address

System ID

DECnet V address

Area Node ID

DECnet IV address

DEC0005A

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Avaya Configuring DECnet Services Manual do Utilizador Página 27