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Configuring DECnet Services

1-12

308619-14.00 Rev 00

Phase IV to Phase V

A router running DECnet Phase IV always attempts to forward a Phase IV data

packet by looking up the destination address in the DECnet Phase IV forwarding

tables. If you enable the DECnet IV to V Transition feature, the router performs

the following actions:

If the router does not find the destination address in the Phase IV forwarding

table, the router maps the Phase IV address to a Phase V address and looks up

its destination in the Phase V forwarding table.

If the router finds the destination address in the Phase V forwarding table, the

router running Phase V translates the source address and Phase IV data packet

header to a Phase V CLNP packet header.

If the router does not find the destination address in the Phase V forwarding

table, the router running Phase V returns the packet to the router running

Phase IV for error processing.

Phase V to Phase IV

In the same way, a router running DECnet Phase V always attempts to forward a

Phase V CLNP packet by looking up the destination address in the DECnet Phase

V forwarding tables. If you enable the DECnet IV to V Transition feature and the

router does not find the destination address, the router performs the following

actions:

If the address is Phase IV-compatible, the router maps the Phase V address to

a Phase IV address and looks up its destination in the Phase IV forwarding

table.

If the router finds the destination address in the Phase IV forwarding table, the

DECnet router running Phase IV translates the source address and Phase V

CLNP packet header to a Phase IV data packet header.

If the router does not find the destination address in the Phase IV forwarding

table, the router running Phase IV returns the packet to the router running

Phase V for error processing.

Figure 1-6

illustrates the translation of a DECnet Phase IV data packet to a Phase

V CLNP packet. Routers in the network are configured either with Phase IV only

or with both Phase IV and Phase V.

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