If a firewall uses LACP or LLDP, negotiation of those
protocols upon failover prevents sub-second failover. However, you
can enable an interface on a passive firewall to negotiate LACP
and LLDP prior to failover. Thus, a firewall in
Passive or
Non-functional HA
state can communicate with neighboring devices using LACP or LLDP.
Such pre-negotiation speeds up failover.