Manual

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interfaces.
show ip interface [interface-name]
Show IPv4 running status of the specified
interface, if there is no interface is specified,
show IPv4 running status of all interfaces.
22.3 Keepalive Gateway Example
Keepalive gateway typical example
In above network topology, interface address of interface vlan10 is 1.1.1.1 255.255.255.0 for
gateway A, interface address of interface vlan100 is 1.1.1.2 255.255.255.0 for gateway B,
gateway B supports keepalive gateway function, the configuration in the following:
1. Adopt the default interval that ARP packet is sent and the retry-count after detection is failing
(the default interval is 10s, the default retry-count is 5 times)
Switch(config)#interface vlan 100
Switch(config-if-vlan100)#keepalive gateway 1.1.1.1
Switch(config-if-vlan100)#exit
2. Configure the interval that ARP packet is sent and the retry-count after detection is failing
manually.
Switch(config)#interface vlan 100
Switch(config-if-vlan100)#keepalive gateway 1.1.1.1 3 3
Switch(config-if-vlan100)#exit
Send ARP detection once 3 seconds to detect whether gateway A is reachable, after 3 times
detection is failing, gateway A is considered to be unreachable.