Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 269)

Multi-Service IronWare Routing Configuration Guide 241
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area prefix-list
area prefix-list
Filters prefixes advertised in type 3 link-state advertisements (LSAs) between Open Shortest Path
First (OSPF) areas of an Area Border Router (ABR). The no form of this command changes or
cancels the filter.
Syntax area {area-id | area_ip} prefix-list prefix-list-name {in | out}
no area {area-id | area_ip} prefix-list prefix-list-name {in | out}
Command
Default
Parameters area-id Identifies the area where filtering is configured in number format.
area-ip Identifies the area where filtering is configured in IP address format.
prefix-list-name Name of the prefix list.
in Prefix list applies to prefixes advertised to the specified area from other
areas.
out Prefix list applies to prefixes advertised out of the specifed area to other
areas.
Command
Modes
Router OSPF subconfiguration mode.
Usage
Guidelines
With this feature enabled in the in direction, all type 3 LSAs originated by the ABR to this area,
based on information from all other areas, are filtered by the prefix list. Type 3 LSAs that were
originated as a result of the area range command in another area are treated like any other type 3
LSA that was originated individually. Any prefix that does not match an entry in the prefix list is
implicitly denied.
With this feature enabled in the out direction, all type 3 LSAs advertised by the ABR, based on
information from this area to all other areas, are filtered by the prefix list.. If the area range
command has been configured for this area, Type 3 LSAs that correspond to the area range
command are treated like any other type 3 LSA.
Prefixes that are not permitted by the prefix list are implicitly denied.
The area prefix-list command is only applicable to the ABRs. If the router is not an ABR the
configuration is accepted, however it will start working only after the router is made an ABR.
Examples The following example filters prefixes that are sent from all other areas in to area “1” using the
prefix list “area_1”.
Brocade(config-ospf-router)# area 1 prefix-list area_1 in
The following example configures the device to use the prefix list “Routesfor20” to determine which
routes to send out to area “10.10.10.1”
Brocade(config-ospf-router)# area 10.10.10.1 prefix-list Routesfor20 out
History
Release Command History
Multi-Service IronWare R05.5.00 This command was introduced