Juniper EX3400 Features Manual
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Brand: Juniper
Category: Network Router , Switch
Type: Features manual
Model: Juniper EX2300 , Juniper EX4300 , Juniper EX3400
Pages: 476
Legacy DHCP and Extended DHCP for Server Versions
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:
Table 3: Legacy DHCP and Extended DHCP Server Hierarchy Levels
HierarchyDHCP Service
edit system services dhcp-local-serverExtended DHCP server
edit access address-assignment poolExtended DHCP address pool
edit system services dhcpLegacy DHCP server
edit forwarding-options helpers bootpLegacy DHCP relay
edit forwarding-options dhcp-relayExtended DHCP relay
edit system services dhcp poolLegacy DHCP address pool
DHCP clients on a switch are always configured at the hierarchy level [edit interfaces
interface-name family dhcp].
5Copyright © 2017, Juniper Networks, Inc.
Chapter 1: DHCP Services