Juniper EX3400

Junos OS includes an extended DHCP local server that enhances traditional DHCP server
operation by providing additional address assignment and client configuration functionality
and flexibility in a subscriber-aware environment. The extended DHCP local server enables
service providers to take advantage of external address-assignment pools and integrated
RADIUS-based configuration capabilities in addition to the continued support of traditional
local address pools. The address-assignment pools are considered external because
they are external to the DHCP local server. The pools are managed independently of the
DHCP local server, and can be shared by different client applications, such as DHCP or
PPPoE access. Table 7 on page 23 provides a comparison of the extended DHCP local
server and a traditional DHCP local server.
The extended DHCP local server provides an IP address and other configuration
information in response to a client request. The server supports the attachment of dynamic
profiles and also interacts with the local AAA Service Framework to use back-end
authentication servers, such as RADIUS, to provide DHCP client authentication. You can
configure the dynamic profile and authentication support on a global basis or for a specific
group of interfaces.
Table 7: Comparing the Extended DHCP Local Server to the Traditional
DHCP Local Server
Traditional
DHCP Local
Server
Extended DHCP
Local ServerFeature
XXLocal address pools
–XExternal, centrally-managed address pools
XXLocal configuration
–XExternal configuration using information from
address-assignment pools or RADIUS servers
–XDynamic-profile attachment
–XRADIUS-based subscriber authentication, and
configuration using RADIUS attributes and Juniper
Networks VSAs
–XIPv6 client support
XXDefault minimum client configuration
You can also configure the extended DHCP local server to support IPv6 clients. Both
DHCP local server and DHCPv6 local server support the specific address request feature,
which enables you to assign a particular address to a client.
23Copyright © 2017, Juniper Networks, Inc.
Chapter 2: DHCP Local Server