Logging Out Dhcp Local Server Subscribers - Juniper JUNOSE SOFTWARE 11.0.X - BROADBAND ACCESS CONFIGURATION GUIDE 4-1-2010 Configuration Manual

client. The determination is based on whether the DHCP clients exist on the same
or on different subnets and subinterfaces.
In the optional configuration, you use the ip dhcp-local unique-client-ids command
to disable the use of the DHCP client's subnet or subinterface to differentiate between
clients with duplicate client IDs or hardware addresses. When DHCP receives the
request from a duplicate ID or address, DHCP terminates the address lease for the
existing client and returns the address to its original address pool. DHCP then assigns
a new address and lease to the new client.
We strongly recommend that you enable the ip dhcp-local unique-client-ids
command in the following situations:
Enabling the ip dhcp-local unique-client-ids command in these cases enables you
to properly manage DHCP clients that roam to different subnets.
The DHCP relay agent application and the DHCP relay proxy application do not
support duplicate client IDs or duplicate hardware addresses.

Logging Out DHCP Local Server Subscribers

You can use the logout subscribers command from Privileged Exec mode to log out
DHCP local server subscribers. For example, you might use this feature if you want
to force a user to request a new lease or if you want to recover functional resources.
The logout subscribers command, unlike the clear ip address binding command
(described in "Clearing an IP DHCP Local Server Binding" on page 476), does not
terminate the subscriber's user session or management representation.
This command applies to DHCP local server local-access and standalone clients, as
well as to PPP users. You can log out all subscribers, or log out subscribers by
username, domain, virtual-router, or port.
Location of DHCP Clients with
Identical IDs or Addresses
On different subinterfaces in the
same subnet
On the same subinterface in
different subnets
On different subinterfaces in
different subnets
On the same subinterface in the
same subnet
When duplicate client IDs and duplicate hardware addresses do not exist in your
network
When the DHCP local server application interacts with DHCP relays in your
network that do not support duplicate client IDs or duplicate hardware addresses
Chapter 19: Configuring DHCP Local Server
How DHCP Local Server Differentiates
Clients
By unique subinterface
By unique subnet
By unique subinterface and unique subnet
DHCP local server cannot distinguish clients
with identical IDs or identical hardware
addresses in this configuration
Logging Out DHCP Local Server Subscribers
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