Cisco Catalyst 9500 Series

If split horizon is enabled, neither autosummary nor interface IP summary addresses are advertised.Note
Procedure
PurposeCommand or Action
Enables privileged EXEC mode. Enter your
password if prompted.
enable
Example:
Device> enable
Step 1
Enters the global configuration mode.configure terminal
Example:
Device# configure terminal
Step 2
Enters interface configuration mode, and
specifies the Layer 3 interface to configure.
interface interface-id
Example:
Device(config)# interface gigabitethernet
1/0/1
Step 3
Configures the IP address and IP subnet.
ip address ip-address subnet-mask
Example:
Device(config-if)# ip address 10.1.1.10
255.255.255.0
Step 4
Configures the IP address to be
summarized and the IP network mask.
ip summary-address rip ip address ip-network
mask
Example:
Device(config-if)# ip summary-address rip
ip address 10.1.1.30 255.255.255.0
Step 5
Disables split horizon on the interface.no ip split horizon
Example:
Device(config-if)# no ip split horizon
Step 6
Returns to privileged EXEC mode.end
Example:
Device(config)# end
Step 7
Routing Configuration Guide, Cisco IOS XE Everest 16.6.x (Catalyst 9500 Switches)
86
Configuring IP Unicast Routing
Configuring Summary Addresses and Split Horizon