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204 Multi-Service IronWare Routing Configuration Guide
53-1003033-02
Adding additional parameters
Configuring an OSPF area prefix list
To filter prefixes advertised in type 3 link-state advertisements (LSAs) between (OSPF) areas of an
Area Border Router (ABR), use the area prefix-list command in router configuration mode. To
change or cancel the filter, use the no form of this command.
Configuring OSPF ABR type 3 LSA filtering
To filter inter-area routes into a specified area, use the following commands beginning in router
configuration mode.
To configure the router to run an OSPF process, enter commands such as the following.
Brocade(config)# router ospf
Brocade(config-ospf-router)#
To filter prefixes advertised in type 3 link-state advertisements (LSAs) between (OSPF) areas of an
Area Border Router (ABR), use the area prefix-list command in router configuration mode. To
change or cancel the filter, use the no form of this command.
Brocade(config-ospf-router)# area 1 prefix-list area in
To configure the switch to filter inter-area routes out of the specified area, enter a command such
as the following.
Brocade(config-ospf-router)# area 10.10.10.1 prefix-list Routesfor20 out
Syntax: [no] area {area-id | area_ip} prefix-list prefix-list-name {in|out}
The prefix-list-name variable specifies the prefix list name.
The area {area-id | area_ip} parameter specifies the area id in different formats.
The in keyword specifies that prefix list is applied to prefixes advertised to the specified area from
other areas.
The out keyword specifies that prefix list is applied to prefixes advertised out of the specified area
to other areas.
TABLE 21 Behavior for prefix list configurations
IP prefix list OSPF area prefix list Event Filtering done
XXX Not defined None No (permit all)
Not defined Defined None Yes (deny all)
Not defined Defined IP prefix list defined Recalculation
Defined (no rules
configured)
Defined None Implicit deny (deny all)
Defined (rules
configured)
Defined IP prefix list deleted Recalculation and deny all
Defined (rules
configured)
Defined IP prefix list rule added or
modified or deleted
Recalculation
Defined (rules
configured)
Defined Area prefix list deleted Recalculation and permit all
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