Avaya Configuring IP Services Manual de usuario Pagina 153

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Customizing OSPF Services
114065 Rev. A 5-23
Specifying Metric Cost
For OSPF, the best path is the one that offers the least-cost metric.
By default, each OSPF interface has a cost of 1. You can use Site Manager to
specify a metric cost for the interface.
You must configure cost metrics if you want to specify a preferred path. Allow the
preferred path to retain the cost metric value of 1, then assign higher-cost metric
values to the less-preferred paths.
Figure 5-3 shows 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 5-3. Configurable Cost Metrics Usage Example
Site Manager: Metric Cost parameter: page A-82
Router 1
Router 2
Router 3
56 Kb
Assigned Cost
Metric = 10
T1
1.544Mb
Assigned Cost
Metric = 1
T1
1.544Mb
Assigned Cost
Metric = 1
Host
B
Host
A
IP0018A
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