The protocol that is considered to be a part of FRHP is called DHCP relay.
A first hop redundancy protocol (FHRP) is defined essentially as a computer networking protocol which is designed to protect the default gateway used on a subnetwork by allowing two or more routers to provide backup for that address. In the event of failure of an active router, the backup router will take over the address, usually within a few seconds.
Now, the protocol that is considered to be a part of FRHP is called DHCP relay. This is because DHCP Relay allows broadcast DHCP messages to be forwarded between networks with DHCP clients and different networks having DHCP servers.
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