Juniper EX3400 Features Guide

Changing the Gateway IP Address (giaddr) Field to the giaddr of the DHCP Relay Agent
You can configure the DHCP relay agent to change the gateway IP address (giaddr) field
in packets that it forwards between a DHCP client and a DHCP server.
To overwrite the giaddr of every DHCP packet with the giaddr of the DHCP relay agent
before forwarding the packet to the DHCP server:
1. Specify that you want to configure override options.
[edit forwarding-options dhcp-relay]
user@host# edit overrides
2. Specify that the giaddr of DHCP packets is overwritten.
[edit forwarding-options dhcp-relay overrides]
user@host# set always-write-giaddr
Related
Documentation
Extended DHCP Relay Agent Overview on page 46•
• Overriding the Default DHCP Relay Configuration Settings on page 68
Replacing the DHCP Relay Request and Release Packet Source Address
You can configure the DHCP relay agent to replace request and release packets with the
gateway IP address (giaddr) before forwarding the packet to the DHCP server.
To replace the source address with giaddr:
1. Specify that you want to configure override options.
[edit forwarding-options dhcp-relay]
user@host# edit overrides
2. Specify that you want to replace the IP source address in DHCP relay request and
release packets with the gateway IP address (giaddr).
[edit forwarding-options dhcp-relay overrides]
user@host# set replace-ip-source-with giaddr
Related
Documentation
Extended DHCP Relay Agent Overview on page 46•
• Overriding the Default DHCP Relay Configuration Settings on page 68
Enabling and Disabling DHCP Snooped Packets Support for DHCP Relay Agent
DHCP relay agent uses a two-part configuration to determine how to handle DHCP
snooped packets. This topic describes the first procedure, in which you enable or disable
snooping support for DHCP relay agent and, optionally, override the default snooping
configuration.
Copyright © 2017, Juniper Networks, Inc.72
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

Weight and Dimensions

Depth	350 mm
Width	437 mm
Height	44 mm
Weight	5740 g