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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


Published: 2010-04-15

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