Related Documentation
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 | |||||
|---|---|---|---|---|---|
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 | Action Taken |
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 |
