This is an unencrypted authentication string which is
carried in all HSRP messages. An authentication string
mismatch prevents a router interface from learning the
designated IP address or HSRP timer values from
other HSRP-enabled routers with the same group number.
The function of this object is not to supply any sort of
security-like authentication but rather to confirm that
what's happening is what's intended. In other words, this
is meant for sanity checking only.