It is mentioned in the
ifconfig(8) man page:
Code:
CARP
ifconfig carp-interface [advbase n] [advskew n] [balancing mode]
[carpnodes vhid:advskew,vhid:advskew,...] [carpdev iface]
[[-]carppeer peer_address] [pass passphrase] [state state]
[vhid host-id]
[snip]
state state
Explicitly force the interface to enter this state. Valid states
are init, backup, and master.