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Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
OL-8915-03
Chapter 34 Configuring IP Unicast Routing
Configuring RIP
To restore clear text authentication, use the
no ip rip authentication mode
interface configuration
command. To prevent authentication, use the
no ip rip authentication key-chain
interface
configuration command.
Configuring Summary Addresses and Split Horizon
Routers connected to broadcast-type IP networks and using distance-vector routing protocols normally
use the split-horizon mechanism to reduce the possibility of routing loops. Split horizon blocks
information about routes from being advertised by a router on any interface from which that information
originated. This feature usually optimizes communication among multiple routers, especially when links
are broken.
Note
In general, disabling split horizon is not recommended unless you are certain that your application
requires it to properly advertise routes.
If you want to configure an interface running RIP to advertise a summarized local IP address pool on a
network access server for dial-up clients, use the
ip summary-address rip
interface configuration
command.
Note
If split horizon is enabled, neither autosummary nor interface IP summary addresses are advertised.
Beginning in privileged EXEC mode, follow these steps to set an interface to advertise a summarized
local IP address and to disable split horizon on the interface:
To disable IP summarization, use the
no ip summary-address rip
router configuration command.
In this example, the major net is 10.0.0.0. The summary address 10.2.0.0 overrides the autosummary
address of 10.0.0.0 so that 10.2.0.0 is advertised out interface Gigabit Ethernet port 2, and 10.0.0.0 is
not advertised. In the example, if the interface is still in Layer 2 mode (the default), you must enter a
no
switchport
interface configuration command before entering the
ip address
interface configuration
command.
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
interface
interface-id
Enter interface configuration mode, and specify the Layer 3
interface to configure.
Step 3
ip address
ip-address subnet-mask
Configure the IP address and IP subnet.
Step 4
ip summary-address rip
ip address ip-network mask
Configure the IP address to be summarized and the IP
network mask.
Step 5
no ip split horizon
Disable split horizon on the interface.
Step 6
end
Return to privileged EXEC mode.
Step 7
show ip interface
interface-id
Verify your entries.
Step 8
copy running-config startup-config
(Optional) Save your entries in the configuration file.
