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Configuring Other MT-OSPF Properties

You can also configure the following properties for all topologies in an instance. You cannot configure the following properties for an individual topology:

Disable not-so-stubby-area (NSSA) support on an autonomous-system border router (ASBR)
Modify the preference value for OSPF internal routes
Modify the default preference value for OSPF external routes
Modify the reference-bandwidth value
Enable graceful restart

To disable exporting Type 7 LSAs into LSAs, include the no-nssa-abr statement.

For a list of hierarchy levels at which you can configure this statement, see the statement summary section for this statement.



[edit protocols ospf]

no-nssa-abr;

By default, internal OSPF routes have a preference value of 10, and external OSPF routes have a preference value of 150. To modify the preference values for all topologies, include the preference statement (for internal routes) or the external-preference statement (for external routes):



[edit protocols ospf]

external-preference preference;

preference preference;

For a complete list of hierarchy levels at which you can configure these statements, see the statement summary sections for these statements.

You can configure a preference value of from 0 through 255 for each statement.

The reference bandwidth is used to calculate the default cost of a route using the following formula:



cost = reference-bandwidth / bandwidth

The default value for the reference bandwidth is 100 Mbps (which you specify as 100,000,000), which gives a metric of 1 for any bandwidth that is 100 Mbps or greater. To modify the default value, Include the reference-bandwidth statement:



[edit protocols ospf]

reference-bandwidth;

The range that you can specify is from 9,600 through 1,000,000,000.

For a complete list of hierarchy levels at which you can configure this statement, see the statement summary section for this statement.

Note: You can specify topology-specific metrics for routes advertised from an interface. For more information, see Configuring Interface Properties for MT-OSPF.

Graceful restart enables a restarting router and its neighbors to continue forwarding packets without disrupting network performance. Because neighboring routers assist in the restart (these neighbors are called helper routers), the restarting router can quickly resume full operation without recalculating algorithms.

Graceful restart is disabled by default. You can globally configure graceful restart for all routing protocols at the [edit routing-options] hierarchy level. To configure graceful restart parameters specifically for OSPF, include the graceful-restart statement at the [edit protocols ospf] hierarchy level. For more information about how to configure graceful restart, see the JUNOS High Availability Configuration Guide.

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