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Ethernet Card Software Feature and Configuration Guide, R7.2
January 2009
Chapter 11 Configuring Networking Protocols
Configuring OSPF
Route summarization is the consolidation of advertised addresses into a single summary route to be
advertised by other areas. If network numbers are contiguous, you can use the area range router
configuration command to configure the ABR to advertise a summary route that covers all networks in
the range.
Note The OSPF area router configuration commands are all optional.
Beginning in privileged EXEC mode, follow these steps to configure area parameters:
Use the no form of these commands to remove the configured parameter value or to return to the
default value. Example 11-7 shows the output of the show ip ospf database and the show ip ospf
privileged EXEC commands.
Command Purpose
Step 1 Router# configure terminal Enters global configuration mode.
Step 2 Router(config)# router ospf
process-id
Enables OSPF routing, and enters router configuration
mode.
Step 3 Router(config)# area
area-id
authentication
(Optional) Allows password-based protection against
unauthorized access to the identified area. The identifier
can be either a decimal value or an IP address.
Step 4 Router(config)# area
area-id
authentication message-digest
(Optional) Enables MD5 authentication on the area.
Step 5 Router(config)# area
area-id
stub
[no-summary]
(Optional) Defines an area as a stub area. The no-summary
keyword prevents an ABR from sending summary link
advertisements into the stub area.
Step 6 Router(config)# area
area-id
nssa
{no-redistribution |
default-information-originate |
no-summary}
(Optional) Defines an area as a not-so-stubby-area. Every
router within the same area must agree that the area is
NSSA. Select one of these keywords:
• no-redistribution—Select when the router is an
NSSA ABR and you want the redistribut e command
to import routes into normal areas, but not into the
NSSA.
• default-information-originate—Select on an ABR to
allow importing type 7 LSAs into the NSSA.
• no-redistribution—Select to not send summary LSAs
into the NSSA.
Step 7 Router(config)# area
area-id
range
address-mask
(Optional) Specifies an address range for which a single
route is advertised. Use this command only with area
border routers.
Step 8 Router(config)# end Returns to privileged EXEC mode.
Step 9 Router# show ip ospf [
process-id
]Displays information about the OSPF routing process in
general or for a specific process ID to verify configuration.
Step 10 Router# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.