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Configuring DECnet Services

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308619-14.00 Rev 00

DECnet IV to V Transition

The DECnet IV to V Transition feature provides the following capabilities:

• Routers running DECnet Phase V can map DECnet Phase IV network layer

addresses to compatible Phase V NSAP addresses, and convert Phase IV data

packets to Phase V Connectionless Network Protocol (CLNP) packets before

forwarding them to a Phase V end node.

• Routers running DECnet Phase IV can map DECnet Phase V NSAP addresses

to compatible Phase IV addresses, and convert Phase V CLNP packets to

Phase IV data packets before forwarding them to a Phase IV end node.

• Routers running Phase V can learn and advertise adjacent Phase IV end node

addresses.

• Routers running Phase IV can learn and advertise adjacent Phase V end node

addresses.

• Routers running DECnet Phase IV or DECnet Phase V can forward packets

without translation when routing their native protocols.

Translating DECnet Addresses

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

a DECnet Phase IV network layer address to a Phase V NSAP address. However,

because a Phase V address is larger than a Phase IV address, a router can translate

a Phase V address only if it is Phase IV-compatible.

A Phase V address is Phase IV-compatible if:

• The leading bytes of the Phase V address match the configured local Phase IV

Prefix. The local Phase IV Prefix defines the addresses eligible for translation

within a local Phase IV routing domain.

• The high-order value of the Phase V System ID is AA000400, which is the

DECnet architectural constant.

• The Area component of the Phase IV address in the Phase V System ID is the

same as the Area field of the Phase V Area Address.

Figure 1-5

shows how a router maps a DECnet Phase V address so that it is Phase

IV-compatible.

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