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Configuring DECnet Services

1-8

308619-14.00 Rev 00

Figure 1-4. Least-Cost Path to a Destination

Forwarding Process

When a router receives a packet, it examines the destination address contained in

the packet header to determine whether to route the packet locally (intra-area) or

forward it to another destination (interarea).

Table 1-1

shows how the router forwards a packet, based on the destination

address in the packet header and whether the router is configured for Level 1 Only

routing or Level 1 and Level 2 routing.

10 10

Router A wants to route a packet to the end node. Three different paths are available.

Router A forwards the packet along path choice 3 because it has the lowest Total Path Cost (12).

Path Choice Path Length Path Cost

A to B, B to EN 2 hops 20

A to D, D to EN 2 hops 15

A to C, C to D, D to EN 3 hops 12

Router

End Node

Key

DEC0004A

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 79 80

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