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Chapter 22 Keepalive Gateway Configuration
22.1 Introduction to Keepalive Gateway
Ethernet port is used to process backup or load balance, for the reason that it is a broadcast
channel, it may not detect the change of physical signal and fails to get to down when the
gateway is down. Keepalive Gateway is introduced to detect the connectivity to the higher-up
gateway, in the case that a Ethernet port connect with a higher-up gateway to form a point-to-
point network topology.
For example: router connects optical terminal device and the line is up all the time, While the
line between moden and remote gateway is down, it is necessary to use a effective method to
detect whether the remote gateway is reachable. At present, detect gateway connectivity by
sending ARP request to gateway on time, if ARP resolution is failing, shutdown the interface, if
ARP resolution is successful, keep the interface up.
Only layer 3 switch supports keepalive gateway function.
22.2 Keepalive Gateway Configuration Task List
Enable or disable keepalive gateway, configure the interval period that ARP request packet is
sent and the retry-count after detection is failing
Show keepalive gateway and IPv4 running status of the interface
1. Enable or disable keepalive gateway, configure the interval period that ARP request packet
is sent and the retry-count after detection is failing
Command
Explanation
Interface mode
keepalive gateway <ip-address>
[{<interval-seconds> | msec <interval-
millisecond >} [retry-count]]
no keepalive gateway
Enable keepalive gateway, configure IP
address of gateway, the interval period that
ARP request packet is sent, and the retry-
count after detection is failing, the no
command disables the function.
2. Show keepalive gateway and IPv4 running status of interface
Command
Explanation
Admin and configuration mode
show keepalive gateway [interface-name]
Show keepalive running status of the
specified interface, if there is no interface is
specified, show keepalive running status of all