--> Hosts are called as subscribers devices when DHCP snooping option 82 is enabled.
--> Each and every subscriber is identified by the switch port connecting through the network and mac address associated with it.
--> Whenever the switch receives the DHCP discover message it simply adds option 82 information and forwards it to DHCP server
--> When DHCP snooping is configured switch will make GIAddress to zero because of that dhcp server will not assign the IP address in correct range.
--> If DHCP server is capable of understanding option 82 information, then no problem otherwise we have to disable option 82.
--> We can disable DHCP snooping option 82 by using following command.
Switch(config)# no ip dhcp snooping information option
---> After configuring this command, whenever the switches receive DHCP discover message it will not add any option 82 information