Server Management Table; Dhcp Local Server Prerequisites - Juniper JUNOSE SOFTWARE 11.2.X - BROADBAND ACCESS CONFIGURATION GUIDE 7-20-2010 Configuration Manual

JunosE 11.2.x Broadband Access Configuration Guide
Table 100: Local Pool Selection in Standalone Mode with AAA Authentication (continued)
Field
Giaddr
Received interface IP address

Server Management Table

DHCP Local Server Prerequisites

462
How the DHCP Local Server Uses the Field
A DHCP local pool is configured with a network address. A gateway IP address (giaddr), which
indicates a client's subnetwork, can be presented to the DHCP local server in the client's DHCP
request message. The giaddr field in the DHCP request message usually contains the IP
address of a DHCP relay server. The router attempts to match the giaddr address in the DHCP
request message with the network address of a DHCP local pool.
The router uses the IP address of the interface on which the DHCP packet is being processed
and attempts to match it with the network address of a DHCP local pool. If the interface
address matches with the IP address configured in the DHCP local address pool on the router,
that pool is used to delegate the address to the client.
For each client that makes requests of the DHCP local server, the router keeps an entry
in the server management table. The entry defines client-specific information and state
information. The router uses this table to identify clients when it receives subsequent
messages and to maintain the state of each client within the DHCP protocol. In addition,
the table contains information that may be transferred to and from the SRC software.
Before you configure DHCP local server, you need to configure interfaces. You can
configure ATM or Ethernet interfaces for DHCP local server. These interfaces can be
numbered or unnumbered. Because subscribers connect to the router from different
subnetworks, you must configure an IP address for each subnetwork on the interface.
This action provides connectivity between the subnetwork and the router.
To configure a numbered IP address for DHCP local server:
Select an ATM or Ethernet interface.
1.
Assign the primary IP address for one subnetwork to this interface.
2.
Assign secondary IP addresses for all other subnetworks to this interface.
3.
To configure an unnumbered IP address for DHCP local server:
Specify a loopback interface.
1.
Assign the primary IP address for one subnet to the loopback interface.
2.
Assign secondary IP addresses for all other subnets to the loopback interface.
3.
Select an ATM or Ethernet interface.
4.
Configure an unnumbered IP address associated with the loopback interface on the
5.
ATM or Ethernet interface.
For information about defining IP addresses, see the Configuring IP chapter in JunosE IP,
IPv6, and IGP Configuration Guide.
Copyright © 2010, Juniper Networks, Inc.