Avaya Configuring IP, ARP, RIP, and OSPF Services Bedienungsanleitung PDF herunterladen (Seite 203)

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101

Customizing OSPF Services

117356-E Rev 00

6-33

Specifying the Metric Cost

For OSPF, the best path is the one that offers the least-cost metric.

You must configure cost metrics if you want to specify a preferred path. Allow the

preferred path to retain the default cost metric value of 1, and then assign

higher-cost metric values to the less-preferred paths.

Figure 6-4

illustrates the benefit of using configurable cost metrics. Assigning the

56 Kb line a cost metric value of 10 forces OSPF to choose the faster T1 line path

as the best path, despite the extra hop, when transmitting a packet from host A to

host B.

Figure 6-4. Example of Using Configurable Cost Metrics

Router 1

Router 2

Router 3

56 Kb

Assigned cost

metric = 10

1.544 Mb

Assigned cost

metric = 1

1.544 Mb

Assigned cost

metric = 1

Host

IP0018A

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