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• DHCP Auto Logout Overview
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DHCP Relay Agent Option 82 Value for Auto Logout

Table 1 indicates how the DHCP relay agent determines the option 82 value used for the client auto logout feature. Depending on the configuration settings, DHCP relay agent takes the action indicated in the right column.

Table 1: DHCP Relay Agent Option 82 Value for Auto Logout

DHCP Relay Agent Configuration Settings					Action Taken
DHCP Relay Configured with Option 82	Discover Packet Contains Option 82	Override “trust-option- 82”	Override “always-write- option-82”	giaddr in non-snooped packet
No	No	–	–	–	No secondary search performed
No	Yes	Yes	–	–	Use option 82 from packet
No	Yes	No	–	Zero	Drop packet
No	Yes	No	–	Non-zero	Use option 82 from packet
Yes	No	–	–	–	Use configured option 82
Yes	Yes	No	–	Zero	Drop packet
Yes	Yes	No	No	Non-zero	Use option 82 from packet
Yes	Yes	No	Yes	Non-zero	Overwrite the configured option 82
Yes	Yes	Yes	No	–	Use option 82 from packet
Yes	Yes	Yes	Yes	–	Overwrite the configured option 82