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Cisco Nexus 3548 Switch NX-OS Unicast Routing Command Reference
OL-27852-01
Chapter Unicast Routing Commands
area filter-list (OSPF)
area filter-list (OSPF)
To filter prefixes advertised in type 3 link-state advertisements (LSAs) between Open Shortest Path First
(OSPF) areas of an Area Border Router (ABR), use the area filter-list command. To change or cancel
the filter, use the no form of this command.
area area-id filter-list route-map map-name {in | out}
no area area-id filter-list route-map map-name {in | out}
Syntax Description
Command Default None
Command Modes Router configuration mode
Command History
Usage Guidelines Use the area filter-list command to filter Type 3 LSAs. If you apply the route map with the in keyword,
the route map filters all Type 3 LSAs originated by the ABR to this area, including Type 3 LSAs that
originated as a result of the area range command in another area.
If you apply the route map with the out keyword, the route map filters all Type 3 LSAs that are
advertised by the ABR to all other areas including Type 3 LSAs that originate locally as a result of the
area range command configured in this area.
Cisco NX-OS implicitly denies any prefix that does not match an entry in the route map.
This command requires the LAN Base Services license.
Examples This example shows how to filter prefixes that are sent from all other areas to area 1:
switch# configure terminal
switch(config)# router ospf 202
switch(config-router)# area 1 filter-list route-map FilterExternal in
switch(config-router)#
area-id Identifier for the OSPF area where you want to configure filtering. Specify as
either a positive integer value or an IP address.
route-map
map-name
Specifies the name of a route map used as the filter policy. The map-name
argument can be any alphanumeric string of up to 63 characters.
in Filters networks sent to this area.
out Filters networks sent from this area.
Release Modification
5.0(3)A1(1) This command was introduced.
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