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

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The following steps provide a high-level description of how DHCP relay proxy interacts

with DHCP clients and DHCP servers.

1. The DHCP client sends a discover packet to locate a DHCP server in the network from

which to obtain configuration parameters for the subscriber.

2. The DHCP relay proxy receives the discover packet from the DHCP client and forwards

copies of the packet to each supporting DHCP server. The DHCP relay proxy then

creates a client table entry to keep track of the client state.

3. In response to the discover packet, each DHCP server sends an offer packet to the

client, which the DHCP relay proxy receives. The DHCP relay proxy does the following:

a. Selects the first offer received as the offer to sent to the client

b. Replaces the DHCP server address with the address of the DHCP relay proxy

c. Forwards the offer to the DHCP client.

4. The DHCP client receives the offer from the DHCP relay proxy.

5. The DHCP client sends a request packet that indicates the DHCP server from which

to obtain configuration information—the request packet specifies the address of the

DHCP relay proxy.

6. The DHCP relay proxy receives the request packet and forwards copies, which include

the address of selected server, to all supporting DHCP servers.

7. The DHCP server requested by the client sends an acknowledgement (ACK) packet

that contains the client configuration parameters.

8. The DHCP relay proxy receives the ACK packet, replaces the DHCP server address

with its own address, and forwards the packet to the client.

9. The DHCP client receives the ACK packet and stores the configuration information.

10. If configured to do so, the DHCP relay proxy installs a host route and Address Resolution

Protocol (ARP) entry for the DHCP client.

11. After the initial DHCP lease is established, the DHCP relay proxy receives all lease

renewals and lease releases from the DHCP client and forwards them to the DHCP

server.

Documentation

Extended DHCP Relay Agent Overview on page 46•

• Enabling DHCP Relay Proxy Mode on page 52

• Configuring Detection of DHCP Relay or DHCP Relay Proxy Client Connectivity on

page 98

Enabling DHCP Relay Proxy Mode

You can enable DHCP relay proxy mode on all interfaces or a group of interfaces.

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