Name: Juniper EX3400
Brand: Juniper
Rating: 5 (1 reviews)

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DHCP Relay Proxy Overview

DHCP relay proxy mode is an enhancement to extended DHCP relay. DHCP relay proxy

supports all DHCP relay features while providing additional features and benefits.

Normally, extended DHCP relay operates as a helper application for DHCP operations.

Except for the ability to add DHCP relay agent options and the gateway address (giaddr)

to DHCP packets, DHCP relay is transparent to DHCP clients and DHCP servers, and

simply forwards messages between DHCP clients and servers.

When you configure DHCP relay to operate in proxy mode, the relay is no longer

transparent. In proxy mode, DHCP relay conceals DHCP server details from DHCP clients,

which interact with a DHCP relay in proxy mode as though it is the DHCP server. For DHCP

servers there is no change, because proxy mode has no effect on how the DHCP server

interacts with the DHCP relay.

DHCP relay proxy provides the following benefits:

•

DHCP server isolation and DoS protection—DHCP clients are unable to detect the

DHCP servers, learn DHCP server addresses, or determine the number of servers that

are providing DHCP support. Server isolation also provides denial-of-service (DoS)

protection for the DHCP servers.

•

Multiple lease offer selection—DHCP relay proxy receives lease offers from multiple

DHCP servers and selects a single offer to send to the DHCP client, thereby reducing

traffic in the network. Currently, the DHCP relay proxy selects the first offer received.

•

Support for both numbered and unnumbered Ethernet interfaces—For DHCP clients

connected through Ethernet interfaces, when the DHCP client obtains an address, the

DHCP relay proxy adds an access internal host route specifying that interface as the

outbound interface. The route is automatically removed when the lease time expires

or when the client releases the address.

•

Logical system support—DHCP relay proxy can be configured in a logical system,

whereas a non-proxy mode DHCP relay cannot.

NOTE: You cannot configure both DHCP relay proxy and extended DHCP

local server on the same interface.

Interaction Among DHCP Relay Proxy, DHCP Client, and DHCP Servers

The DHCP relay agent is configured on the router (or switch), which operates between

the DHCP client and one or more DHCP servers.

Chapter 4: DHCP Relay Agent

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