hello-interval (VSRP)
Hello messages from master are sent to backup every second.
VSRP VRID configuration mode
The Master periodically sends hello messages to the backup. The backup routers use the hello messages as verification that the master is still online. If the backup routers stop receiving the hello messages for the period of time specified by the dead interval, the backup routers determine that the master router is dead. At that point, the backup router with the highest priority becomes the new master router.
By default, the dead interval is internally derived from the hello interval. It is
equal to 3 times the hello interval plus one-half second. Generally, if you change
the hello interval on the master router using the
hello-interval command, you also should also change the dead interval on the backup routers using
the
dead-interval command.
The
no form resets the hello message interval to its default value of 1000 milliseconds
(1 second).
The following example sets the hello message interval to 10,000 milliseconds.
device# configure terminal device(config)# vlan 400 device(config-vlan-400)# tagged ethernet 1/1/4 to 1/1/9 device(config-vlan-400)# vsrp vrid 4 device(config-vlan-400-vrid-4)# hello-interval msec 10000
The following example sets the hello message interval to 15 seconds.
device# configure terminal device(config)# vlan 400 device(config-vlan-400)# tagged ethernet 1/1/4 to 1/1/9 device(config-vlan-400)# vsrp vrid 4 device(config-vlan-400-vrid-4)# hello-interval 15