Juniper EX3400 Features Guide

always-write-option-82
Syntax always-write-option-82;
Hierarchy Level [edit forwarding-options dhcp-relay overrides],
[edit forwarding-options dhcp-relay group group-name overrides],
[edit logical-systems logical-system-name forwarding-options dhcp-relay overrides],
[edit logical-systems logical-system-name forwarding-options dhcp-relay group group-name
overrides],
[edit logical-systems logical-system-name routing-instances routing-instance-name
forwarding-options dhcp-relay overrides],
[edit logical-systems logical-system-name routing-instances routing-instance-name
forwarding-options dhcp-relay group group-name overrides],
[edit routing-instances routing-instance-name forwarding-options dhcp-relay overrides],
[edit routing-instances routing-instance-name forwarding-options dhcp-relay group
group-name overrides],
[edit routing-instances routing-instance-name forwarding-options dhcp-relay group
group-name interface interface-name overrides]
Release Information Statement introduced in Junos OS Release 8.3.
Statement introduced in Junos OS Release 12.3R2 for EX Series switches.
Description Override the DHCP relay agent information option (option 82) in DHCP packets destined
for a DHCP server. The use of this option causes the DHCP relay agent to perform one of
the following actions, depending on how it is configured:
• If the DHCP relay agent is configured to add option 82 information to DHCP packets,
it clears the existing option 82 values from the DHCP packets and inserts the new
values before forwarding the packets to the DHCP server.
• If the DHCP relay agent is not configured to add option 82 information to DHCP packets,
it clears the existing option 82 values from the packets, but does not add any new
values before forwarding the packets to the DHCP server.
Required Privilege
Level
interface—To view this statement in the configuration.
interface-control—To add this statement to the configuration.
Related
Documentation
• Extended DHCP Relay Agent Overview on page 46
Copyright © 2017, Juniper Networks, Inc.148
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