Data Flow For Radius-Sourced Dhcp Options; Figure 3: Dhcp Options Data Flow - Juniper EX3400 Features Manual

DHCP and Other System Services Feature Guide for EX2300, EX3400, and EX4300 Switches

Data Flow for RADIUS-Sourced DHCP Options

34
Data Flow for RADIUS-Sourced DHCP Options on page 34
Multiple VSA 26-55 Instances Configuration on page 35
DHCP Options That Cannot Be Centrally Configured on page 35
Figure 3 on page 34 shows the procedure subscriber management (DHCP management)
uses when configuring DHCP options for subscribers (DHCP clients).

Figure 3: DHCP Options Data Flow

Subscriber 1
1
Subscriber 2
Subscriber 30
Subscriber 31
DSLAM
Subscriber 32
Subscriber 60
The following general sequence describes the data flow when subscriber management
(DHCP management) uses RADIUS-sourced DHCP options and VSA 26-55 to configure
a DHCP subscriber (client):
The subscriber (DHCP client) sends a DHCP discover message (or DHCPv6 solicit
1.
message) to the DHCP local server. The message includes client-sourced DHCP
options.
The DHCP local server initiates authentication with the Junos OS RADIUS client.
2.
The RADIUS client sends an Access-Request message on behalf of the subscriber
3.
(DHCP client) to the external RADIUS server. The message includes the subscriber's
(DHCP client's) client-sourced DHCP options.
The external RADIUS server responds by sending an Access-Accept message to the
4.
RADIUS client. The Access-Accept message includes the RADIUS-sourced opaque
DHCP options in VSA 26-55.
The RADIUS client sends the DHCP options string to DHCP local server. If there are
5.
multiple VSA 26-55 instances, the RADIUS client first assembles them into a single
options string.
DHCP local server processes all options into the DHCP offer (or DHCPv6 reply)
6.
message, except for the RADIUS-sourced VSA 26-55 DHCP options. After processing
RADIUS client
2 5
DHCP local server
6
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3
RADIUS
4
server