This timer can be changed and people used to avoid doing so because it was thought that lowering
the hello value would place an unnecessary load on the routers. That isn’t true with most
of the routers today; in fact, you can configure the timers in milliseconds, meaning the failover
time can be in milliseconds! Still, keep in mind that increasing the value will make the standby
router wait longer before taking over for the active router when it fails or can’t communicate.
Hold timer The hold timer specifies the interval the standby router uses to determine whether
the active router is offline or out of communication. By default, the hold timer is 10 seconds,
roughly three times the default for the hello timer. If one timer is changed for some reason,