Avaya Configuring DECnet Services User Manual download pdf (Page 23)

DECnet Overview

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When deciding among multiple paths to a destination, the router chooses the path

that is assigned a lower path cost over one assigned a higher cost, even if the

lower-cost path is longer (Figure 1-4

). If two paths have the same cost, the router

chooses the path whose next hop has the higher address. The amount of traffic on

a circuit does not affect the path selected by the router.

Once the router determines the least-cost path to a destination, it stores the

identity of the corresponding adjacent router in its forwarding database. The

adjacent router is the next hop on the path toward the destination.

The router keeps separate forwarding databases for intra-area and interarea

routing. If you configure the router to perform Level 1 Only routing, it does not

process Level 2 updates. Instead, it forwards interarea traffic to the nearest Level 2

router.

The complete distance (or number of hops) that a packet travels from the source to

its destination is the path length. The maximum number of hops the routing

algorithm will forward a packet to is called the maximum hops value. (To set the

maximum hops value, refer to Chapter 3.) If the distance between the source and

destination exceeds the maximum hops value, the packet is returned or dropped.

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Avaya Configuring DECnet Services User Manual Page 23