Configuring Ospf - Cisco WS-C3750-48PS-S Software Configuration Manual

Network switch
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Chapter 34
Configuring IP Unicast Routing
Beginning in privileged EXEC mode, follow these steps to disable split horizon on the interface:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
ip address ip-address subnet-mask
Step 4
no ip split-horizon
Step 5
end
Step 6
show ip interface interface-id
Step 7
copy running-config startup-config
To enable the split horizon mechanism, use the ip split-horizon interface configuration command.

Configuring OSPF

This section briefly describes how to configure Open Shortest Path First (OSPF). For a complete
description of the OSPF commands, refer to the "OSPF Commands" chapter of the Cisco IOS IP
Command Reference, Volume 2 of 3: Routing Protocols, Release 12.2.
Note
OSPF classifies different media into broadcast, nonbroadcast, and point-to-point networks. The
Catalyst 3750 switch supports broadcast (Ethernet, Token Ring, and FDDI) and point-to-point networks
(Ethernet interfaces configured as point-to-point links).
OSPF is an Interior Gateway Protocol (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, OSPF management information base (MIB).
The Cisco implementation conforms to the OSPF Version 2 specifications with these key features:
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 configuration of all routers.
78-16180-02
Definition of stub areas is supported.
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 routes learned through IGRP and RIP.
OSPF routes can also be exported into IGRP and RIP.
Plain text and MD5 authentication among neighboring routers within an area is supported.
Configurable routing interface parameters include interface output cost, retransmission interval,
interface transmit delay, router priority, router dead and hello intervals, and authentication key.
Virtual links are supported.
Not-so-stubby-areas (NSSAs) per RFC 1587are supported.
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the interface to
configure.
Configure the IP address and IP subnet.
Disable split horizon on the interface.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Catalyst 3750 Switch Software Configuration Guide
Configuring OSPF
34-25

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