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Configuring Interface Properties for MT-OSPF

The default value of the topology metric is the same as the default metric value calculated by OSPF or the value configured for the OSPF metric. You can configure a topology-specific metric for an OSPF interface. To configure interfaces of MT-OSPF, Include the following statements at the [edit protocols ospf area area-id] hierarchy level:




interface interface-name {
metric metric;



topology (ipv4-multicast
| name);
metric metric;
}


}

All OSPF interfaces have a cost, which is a routing metric that is used in the link-state calculation. Routes with lower total path metrics are preferred over those with higher path metrics. The default value for the OSPF metric for an interface is 1. You can modify the default value for an OSPF interface and configure a topology-specific metric for that interface. The topology-specific metric applies to routes advertised from the interface that belong only to that topology. The range that you can configure is from 1 through 65,535.

You can also configure any interface that belongs to one or more topologies to advertise the direct interface addresses without actually running OSPF on that interface. By default, OSPF must be configured on an interface for direct interface addresses to be advertised as interior routes. Include the passive statement at the [edit protocols ospf area area-id interface interface-name] hierarchy level:



[edit protocols ospf]

area area-id {


interface interface-name {

passive;

topology name;
}


}

Note: If you configure an interface with the passive statement, it applies to all the topologies to which the interface belongs. You cannot configure an interface as passive for only one specific topology and have it remain active for any other topologies to which it belongs.

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