Legacy Dhcp And Extended Dhcp For Server Versions; Dhcp Services; Table 3: Legacy Dhcp And Extended Dhcp Server Hierarchy Levels - Juniper EX3400 Features Manual

Legacy DHCP and Extended DHCP for Server Versions

Table 3: Legacy DHCP and Extended DHCP Server Hierarchy Levels

DHCP Service
Extended DHCP server
Extended DHCP address pool
Legacy DHCP server
Legacy DHCP relay
Extended DHCP relay
Legacy DHCP address pool
Copyright © 2017, Juniper Networks, Inc.
Two versions of both DHCP server and DHCP relay agent are available on EX Series, QFX
Series, and OCX Series switches. The original legacy DHCP server and legacy DHCP relay
agent can be used in the same network as the extended DHCP servers and extended
DHCP relay agent—extended DHCP is also referred to as virtual router (VR) aware DHCP.
You cannot configure legacy DHCP and extended DHCP versions on the same switch.
Because the newer extended DHCP server version has more features, we recommend
that you configure the extended DHCP server if it is supported by the switch.
The extended DHCP server version has the following added features:
Graceful Routing Engine switchover (GRES), which provides mirroring support for
clients.
Virtual routing and forwarding (VRF), which allows multiple instances of a routing
table to simultaneously coexist on the same switch. For details, see Understanding
Virtual Routing Instances on EX Series Switches .
NOTE: Legacy DHCP supports the circuit ID and the remote ID fields for the
relay agent option (option 82). Extended DHCP for the relay agent option
supports only circuit ID. See EX Series Switch Software Features Overview for
a list of switches that support extended DHCP (VR-aware DHCP).
Legacy DHCP and extended DHCP servers can be configured at the hierarchy levels
shown in Table 3 on page 5:
Hierarchy
edit system services dhcp-local-server
edit access address-assignment pool
edit system services dhcp
edit forwarding-options helpers bootp
edit forwarding-options dhcp-relay
edit system services dhcp pool
DHCP clients on a switch are always configured at the hierarchy level
interface-name family dhcp]
.
Chapter 1: DHCP Services
[edit interfaces
5