Juniper EX3400 Features Guide

Table 15: DHCP Relay Agent Option 82 Value for Auto Logout (continued)
DHCP Relay Agent Configuration Settings
Action
Taken
giaddr in
non-snooped
packet
Override
“always-write-
option-82”
Override
“trust-option-
82”
Discover
Packet
Contains
Option 82
DHCP Relay
Configured
with Option
82
Use
configured
option 82
–––NoYes
Drop packetZero–NoYesYes
Use option 82
from packet
Non-zeroNoNoYesYes
Overwrite the
configured
option 82
Non-zeroYesNoYesYes
Use option 82
from packet
–NoYesYesYes
Overwrite the
configured
option 82
–YesYesYesYes
Related
Documentation
DHCP Auto Logout Overview on page 124•
• Automatically Logging Out DHCP Clients on page 127
Automatically Logging Out DHCP Clients
You can configure the extended DHCP local server and extended DHCP relay to
automatically log out DHCP clients. Auto logout immediately releases an existing client
when DHCP receives a discover packet from a client whose identity matches an existing
client. DHCP then releases the existing client IP address without waiting for the normal
lease expiration.
NOTE: When the existing client is released, the new client undergoes the
normal authentication process. The new client might not receive the same
IP address as the original client.
To configure DHCP client auto logout:
1. Specify that you want to configure override options.
•
For DHCP local server:
127Copyright © 2017, Juniper Networks, Inc.
Chapter 10: Managing IP Address Assignment

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