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DECnet Overview

114050 Rev. A 1-9

The Designated Router

You assign a designated router to each circuit in a DECnet network. If an end

node on an Ethernet segment receives a packet it cannot forward (either because

the destination node’s address is not in the end node’s destination address cache,

or the destination node does not reside on the circuit), the end node forwards the

packet to the designated router. The designated router then forwards the packet

toward the destination.

You specify a designated router by assigning a router the highest priority value

among all routers on the Ethernet circuit. If you do not choose a designated router,

or if you assign two or more routers the same priority, the router assigned with the

highest Node ID becomes the designated router by default. refer to Chapter 3 for

details on assigning the designated router.

Table 1-1. Router Forwarding Based on the Destination Address in the

Packet Header

Destination Address

Router Conﬁguration

(Level 1 and Level 2 or

Level 1 Only) Router Action

Intra-area either Forwards the packet toward

the destination system.

Interarea Level 1 and Level 2 Forwards the packet to the

next-hop router, node, or end

system speciﬁed in its

forwarding database.

Interarea Level 1 Only Forwards the packet to the

nearest Level 2 router.

Unknown either Returns the packet to the

source node if the return to

sender ﬂag is set in the data

packet.

Unreachable

(for example, if the

maximum hops value is

exceeded)

Level 1 and Level 2 Drops the packet.

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Avaya Configuring DECnet Services Bedienungsanleitung Seite 31