Name: Juniper EX3400
Brand: Juniper
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Configuring DHCP on a Switch

A DHCP configuration consists of two parts: the configuration for a DHCP server and the

configuration for DHCP clients. The DHCP server configuration is simple if you accept

the default configurations.

When you configure a legacy DHCP server, you only need to define the DHCP server name

and the interface on the switch. You can use the default configuration for the rest of the

settings. When you configure an extended DHCP server, you need to only define a DHCP

pool, indicate IP addresses for the pool, and create a server group. You can use the default

configuration for the rest of the settings.

For directions for configuring either a legacy DHCP server or an extended DHCP server,

see Configuring a DHCP Server on Switches (CLI Procedure).

To configure a DHCP client, set the client’s DHCP interface address in the [edit interfaces

interface-name unit 0 family inet dhcp] hierarchy. For directions for configuring a DHCP

client on a switch, see “Configuring a DHCP Client (CLI Procedure)” on page 17.

How DHCP Works

DHCP consists of a four-step transfer process beginning with a broadcast DHCP discovery

message from the client. As the second step, the client receives a DHCP offer message

from the server. This message includes the IP address and mask, and some other specific

parameters. The client then sends a DHCP request message to accept the IP address

and other parameters that it received from the server in the previous step. The DHCP

server sends a DHCP response message and removes the now-allocated address from

the DHCP address pool. See Figure 2 on page 6.

Figure 2: DHCP Four-Step Transfer

NOTE: Because the DHCP discovery message from the client is a broadcast

message and because broadcast messages cross other segments only when

they are explicitly routed, you might have to configure a DHCP relay agent

on the switch interface so that all DHCP discovery messages from the clients

are forwarded to one DHCP server.

Documentation

Configuring a DHCP Client (CLI Procedure) on page 17•

• Configuring a DHCP Server on Switches (CLI Procedure)

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

Juniper EX3400 Specifications

General

Switch type	Managed
Switch layer	L2/L3
Quality of Service (QoS) support	Yes
Safety	UL-UL60950-1, C-UL CAN/CSA 22.2 No.60950-1, TUV/GS to EN 60950-1, CB-IEC60950-1, EN 60825-1
Form factor	1U
Product color	Black
Electromagnetic compatibility	FCC 47CFR 15 A, EN 55022 A, ICES-003 A, VCCI A, AS/NZS CISPR 22 A, CISPR 22 A, EN 55024, EN 300386, CE
SFP+ module slots quantity	4
QSFP+ module slots quantity	2
Installed SFP+ modules quantity	0
Basic switching RJ-45 Ethernet ports type	Gigabit Ethernet (10/100/1000)
Basic switching RJ-45 Ethernet ports quantity	48
Memory type	DRAM
Noise level	35 dB
Flash memory	2000 MB
Processor frequency	1000 MHz
Virtual stacking (units)	10
Throughput	250 Mpps
Jumbo frames	9216
MAC address table	32000 entries
Number of VLANs	4093
Networking standards	IEEE 802.1D, IEEE 802.1Q, IEEE 802.1ab, IEEE 802.1p, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3ae, IEEE 802.3u, IEEE 802.3z
Virtual LAN features	Port-based VLAN
Copper ethernet cabling technology	10BASE-T, 100BASE-T, 1000BASE-T
Power consumption (max)	120 W
Number of power supply units	1
Operating altitude	0 - 3048 m
Non-operating altitude	3048 - 4877 m
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	0 - 45 °C
Storage relative humidity (H-H)	0 - 95 %
Operating relative humidity (H-H)	10 - 85 %
DHCP features	DHCP server, DHCP client
Authentication	MAC-based authentication, Port-based authentication
Security algorithms	802.1x RADIUS, HTTPS, SNMP, SSH-2
Fiber ethernet cabling technology	1000BASE-X