client. The determination is based on whether the DHCP clients exist on the same
or on different subnets and subinterfaces.
How DHCP Local Server Differentiates
Clients
Location of DHCP Clients with
Identical IDs or Addresses
By unique subinterface
On different subinterfaces in the
same subnet
By unique subnet
On the same subinterface in
different subnets
By unique subinterface and unique subnet
On different subinterfaces in
different subnets
DHCP local server
cannot distinguish clients
with identical IDs or identical hardware
addresses in this configuration
On the same subinterface in the
same subnet
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:
■
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
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
.
Logging Out DHCP Local Server Subscribers
■
475
Chapter 19: Configuring DHCP Local Server
Содержание JUNOSE 11.0.X MULTICAST ROUTING
Страница 6: ...vi...
Страница 28: ...xxviii Table of Contents JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 36: ...xxxvi List of Tables JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 42: ...2 Managing Remote Access JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 204: ...164 Managing RADIUS and TACACS JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 274: ...234 CLI Commands Used to Modify RADIUS Attributes JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 292: ...252 Monitoring RADIUS Relay Server JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 336: ...296 RADIUS Client Terminate Reasons JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 368: ...328 Managing L2TP JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 408: ...368 Configuring the Weighted Load Balancing Method JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 444: ...404 PPP Accounting Statistics JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 492: ...452 Monitoring Operational Status within the Current VR Context JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 494: ...454 Managing DHCP JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 510: ...470 DHCP Local Server Configuration Tasks JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 528: ...488 Configuring the Router to Work with the SRC Software JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 556: ...516 Configuring DHCP Relay Proxy JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 616: ...576 Managing the Subscriber Environment JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 632: ...592 Subscriber Management Configuration Examples JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 636: ...596 Monitoring Active IP Subscribers Created by Subscriber Management JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 672: ...632 Monitoring Active IP Subscribers Created by Subscriber Management JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 674: ...634 Managing Subscriber Services JUNOSe 11 0 x Broadband Access Configuration Guide...
Страница 767: ...Part 7 Index Index on page 729 Index 727...
Страница 768: ...728 Index JUNOSe 11 0 x Broadband Access Configuration Guide...