Automatically Logging Out Dhcp Clients - Juniper EX3400 Features Manual

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Automatically Logging Out DHCP Clients

Copyright © 2017, Juniper Networks, Inc.
Table 15: DHCP Relay Agent Option 82 Value for Auto Logout (continued)
DHCP Relay Agent Configuration Settings
DHCP Relay Discover
Configured Packet
with Option Contains
82 Option 82
Yes No
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
DHCP Auto Logout Overview on page 124
Automatically Logging Out DHCP Clients on page 127
You can configure the extended DHCP local server and extended DHCP relay to
automatically log out DHCP clients. Auto logout immediately releases an existing client
when DHCP receives a discover packet from a client whose identity matches an existing
client. DHCP then releases the existing client IP address without waiting for the normal
lease expiration.
NOTE: When the existing client is released, the new client undergoes the
normal authentication process. The new client might not receive the same
IP address as the original client.
To configure DHCP client auto logout:
Specify that you want to configure override options.
1.
For DHCP local server:
Chapter 10: Managing IP Address Assignment
Override Override
"trust-option- "always-write-
82" option-82"
– –
No –
No No
No Yes
Yes No
Yes Yes
giaddr in
non-snooped Action
packet Taken
– Use
configured
option 82
Zero Drop packet
Non-zero Use option 82
from packet
Non-zero Overwrite the
configured
option 82
– Use option 82
from packet
– Overwrite the
configured
option 82
127