Avaya Configuring DECnet Services Bedienungsanleitung PDF herunterladen (Seite 29)

DECnet Overview

308619-14.00 Rev 00

1-13

Figure 1-6. Translation of a DECnet Phase IV Data Packet to a Phase V CLNP Packet

A Phase IV host sends a data packet to a Phase V end node. The Phase IV host

routes the packet to a router running both Phase IV and Phase V.

Because the router has Phase IV configured, it routes the Phase IV data packet

to the next router on the network, which also has Phase IV configured.

This router routes the Phase IV data packet to the next router on the network,

which has both Phase IV and Phase V configured.

Because the destination address of the packet is a Phase V end node, the

router maps the address to a Phase V address, and then looks it up in the Phase

V forwarding tables. The router then translates the source address and packet

header.

The router then forwards the packet to the Phase V end node.

Advertising Routes

With the DECnet IV to V Transition feature enabled, the only routing information

exchanged between DECnet Phase IV and Phase V is end node addresses.

The Phase IV router advertises Phase V end nodes in Level 1 topology update

packets. The DECnet Phase V router can reside in only one area. Therefore, the

Phase V router advertises Phase IV end nodes in Level 1 link state packets only

for the areas in common between Phase IV and Phase V.

IV Host IV and V IV only IV and V V Host

Data packet Phase IV Phase IV router Phase IV router Phase V host

is sent to

router routes

routes packet.

gives packet to

gets Phase V

packet.

Phase V packet.

Phase V router

host.

for translation.

DEC0006A

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 79 80

Keine Kommentare

Avaya Configuring DECnet Services Bedienungsanleitung Seite 29