CANOGA PERKINS CanogaOS Command Reference - Manual (Page 243)

CanogaOS Command Line Reference Revision 1.02
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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 are sent to all other
areas, only if at least one prefix in the area range matches an entry in the prefix list.
If all specific prefixes are denied by the prefix list, type 3 LSAs that correspond to the area range
command will not be sent to any other area. Prefixes that are not permitted by the prefix list are
implicitly denied.
Examples
The following example filters prefixes that are sent from all other areas to area 1:
Switch(config-router)# area 1 filter-list prefix AREA_1 in
Related Commands
area range
15.4 area range
To consolidate and summarize routes at an area boundary, use the area range command in router
configuration mode. To disable this function, use the no form of this command.
Command Syntax
area area-id range { address mask | address/prefix-length} [advertise | not-advertise]
no area area-id range {ip-address mask | ip-address/prefix-length}
area-id Identifier of the area about which routes are to be summarized.
address IPv4 address.
wildcard-mask Mask for the associated IP subnet..
prefix-length Prefix length of the address.
Default
This command is disabled by default.
Command Mode
Router configuration
Usage
The area range command is used only with Area Border Routers (ABRs). It is used to consolidate or
summarize routes for an area. The result is that a single summary route is advertised to other areas by
the ABR. Routing information is condensed at area boundaries. External to the area, a single route is