Cisco ASA 5505 - Manual (Page 469)

24-7
Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 24 Configuring OSPF
Customizing OSPF
To configure the software advertisement on one summary route for all redistributed routes included for
a network address and mask, perform the following steps:
Detailed Steps
Configuring Route Summarization Between OSPF Areas
Route summarization is the consolidation of advertised addresses. This feature causes a single summary
route to be advertised to other areas by an area boundary router. In OSPF, an area boundary router
advertises networks in one area into another area. If the network numbers in an area are assigned in a
way so that they are contiguous, you can configure the area boundary router to advertise a summary route
that includes all the individual networks within the area that fall into the specified range.
To define an address range for route summarization, perform the following steps:
Detailed Steps
Command Purpose
Step 1 router ospf process_id
Example:
hostname(config)# router ospf 1
Creates an OSPF routing process and enters router configuration
mode for this OSPF process.
The process_id argument is an internally used identifier for this
routing process and can be any positive integer. This ID does not
have to match the ID on any other device; it is for internal use
only. You can use a maximum of two processes.
Step 2 summary-address ip_address mask
[not-advertise] [tag tag]
Example:
hostname(config)# router ospf 1
hostname(config-router)# summary-address
10.1.0.0 255.255.0.0
Sets the summary address.
In this example, the summary address 10.1.0.0 includes addresses
10.1.1.0, 10.1.2.0, 10.1.3.0, and so on. Only the 10.1.0.0 address
is advertised in an external link-state advertisement.
Command Purpose
Step 1 router ospf process_id
Example:
hostname(config)# router ospf 1
Creates an OSPF routing process and enters router configuration
mode for this OSPF process.
The process_id argument is an internally used identifier for this
routing process. It can be any positive integer. This ID does not
have to match the ID on any other device; it is for internal use
only. You can use a maximum of two processes.
Step 2 area area-id range ip-address mask
[advertise | not-advertise]
Example:
hostname(config)# router ospf 1
hostname(config-router)# area 17 range
12.1.0.0 255.255.0.0
Sets the address range.
In this example, the address range is set between OSPF areas.