Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 260)

The ip-mask parameter specifies the portions of the IP address that a route must contain to be
summarized in the summary route. In the example above, all networks that begin with 209.157 are
summarized into a single route.
The advertise and not-advertise parameters specify whether you want the device to send type 3
LSAs for the specified range in this area. The default is advertise .
Assigning an area range (optional)
You can assign a range for an area, but it is not required. Ranges allow a specific IP address and
mask to represent a range of IP addresses within an area, so that only that reference range address is
advertised to the network, instead of all the addresses within that range. Each area can have up to 32
range addresses.
To define an area range for subnets on 10.45.5.1 and 10.45.6.2, enter the following command.
device(config)# router ospf
device(config-ospf-router)# area 10.45.5.1 range 10.45.0.0 255.255.0.0
device(config-ospf-router)# area 10.45.6.2 range 10.45.0.0 255.255.0.0
Syntax: [no] area { num | ip-addr } range ip-addr ip-mask
The num and ip-addr parameters specify the area number, which can be in IP address format.
The range ip-addr parameter specifies the IP address portion of the range. The software compares
the address with the significant bits in the mask. All network addresses that match this comparison are
summarized in a single route advertised by the router.
The ip-mask parameter specifies the portions of the IP address that a route must contain to be
summarized in the summary route. In the example above, all networks that begin with 10.45 are
summarized into a single route.
Assigning an area cost (optional parameter)
You can assign a cost for an area, but it is not required. To consolidate and summarize routes at an
area boundary, use the area range cost command in router configuration mode.
If the cost parameter is specified, it will be used (overriding the computed cost) to generate the
summary LSA. If the cost parameter is not specified, then the existing range metric computation max
or min cost of routes falling under this range will be used to generate summary LSA.
NOTE
The area should be already configured before using this command.
Creates an area range entry with ip address 10.1.1.1 and network mask 255.255.255.0 with the area-
id 10.
device(config)# router ospf
device(config-ospf-router)# area 10 range 10.1.1.1 255.255.255.0
Modifies the address range status to DoNotAdvertise . Neither the individual intra-area routes falling
under range nor the ranged prefix is advertised as summary LSA.
device(config)# router ospf
device(config-ospf-router)# area 10 range 10.1.1.1 255.255.255.0 not-advertise
Assigning an area range (optional)
260 FastIron Ethernet Switch Layer 3 Routing Configuration Guide
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