Cisco Systems 15327 Configuring OSPF

11-9
Ethernet Card Software Feature and Configuration Guide, R7.2
January 2009
Chapter 11 Configuring Networking Protocols
Configuring OSPF
To disable IP summarization, use the no ip summary-address rip router configuration command.
Note If split horizon is enabled, neither autosummary nor interface summary add resses (those configured with
the ip summary-address rip router configuration command) are advertised.
Configuring OSPF
This section briefly describes how to configure the Open Shortest Path First (OSPF) protocol. For a
complete description of the OSPF commands, refer to the “OSPF Commands” chapter of the Cisco IOS
IP and IP Routing Command Reference publication.
OSPF is an IGP designed expressly for IP networks, supporting IP subnetting and tagging of externally
derived routing information. OSPF also allows packet authentication and uses IP multicast when sending
and receiving packets. The Cisco implementation supports RFC 1253, the OSPF MIB.
The Cisco implementation conforms to the OSPF Version 2 specifications with these key features:
• Stub areas—Definition of stub areas is supported.
• Route redistribution—Routes learned through any IP routing protocol can be redistributed into
another IP routing protocol. At the intradomain level, this means that OSPF can import and export
routes learned through protocols such as EIGRP and RIP.
• Authentication—Plain text and MD5 authentication among neighboring routers within an area are
supported.
• Routing interface parameter—Configurable parameters supported i nclude interface output cost,
retransmission interval, interface transmit delay, router priority, router dead and hello intervals, and
authentication key.
• Virtual links—Virtual links are supported.
• Not-so-stubby-area (NSSA)—RFC 1587.
OSPF typically requires coordination among many internal routers, area border routers (ABRs)
connected to multiple areas, and autonomous system boundary routers (ASBRs). The minimum
configuration would use all default parameter values, no authentication, and interfaces assigned to areas.
If you customize your environment, you must ensure coordinated configur ation of all routers.
Table 11-2 shows the default OSPF configuration.
Step 4 Router(config-if)# ip
summary-address rip
ip-address
ip-network-mask
Configures the IP address to be summarized and the IP
network mask.
Step 5 Router(config-if)# no ip split
horizon
Disables split horizon on the interface.
Step 6 Router(config-if)# end Returns to privileged EXEC mode.
Step 7 Router# show ip interface
interface-id
Verifies your entries.
Step 8 Router# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.
Command Purpose