Juniper EX3400 Features Guide

CHAPTER 9
Forcing Dynamic Reconfiguration of
Clients from a DHCP Local Server
•
Understanding Dynamic Reconfiguration of Extended DHCP Local Server
Clients on page 111
•
Configuring Dynamic Client Reconfiguration of Extended Local Server Clients on page 114
•
Requesting DHCP Local Server to Initiate Reconfiguration of Client Bindings on page 116
•
Configuring Dynamic Reconfiguration Attempts for DHCP Clients on page 117
•
Configuring Deletion of the Client When Dynamic Reconfiguration Fails on page 118
•
Configuring Reconfiguration of the Client on Receipt of RADIUS-Initiated
Disconnect on page 119
Understanding Dynamic Reconfiguration of Extended DHCP Local Server Clients
Dynamic reconfiguration of clients enables the extended DHCP local server to initiate a
client update without waiting for the client to initiate a request.
Default Client/Server Interaction
Typically the DHCP client initiates all of the basic DHCP client/server interactions. The
DHCP server sends information to a client only in response to a request from that client.
This behavior does not enable a client to be quickly updated with its network address
and configuration in the event of server changes:
NOTE: Technically, the DHCP client/server interactions are the same on
routers and switches. However, the primary usage of this technology on the
routers is for subscriber management. The switches are not used for subscriber
management. Therefore, this topic provides two sample scenarios. The
actions are the same, but the implementation details are different.
•
On routers—Suppose a service provider restructures its addressing scheme or changes
the server IP addresses that it provided to clients. Without dynamic reconfiguration,
the service provider typically clears the DHCP server binding table, but cannot inform
the DHCP clients that their bindings have been cleared. Consequently, the DHCP client
operates as though its IP address is still valid, but it is now unable to communicate
111Copyright © 2017, Juniper Networks, Inc.

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