Name: Juniper EX3400
Brand: Juniper
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Interface-specific scope—Forward incoming broadcast traffic on the port from a

configured Layer 3 interface to a configured destination server IP address.

Configure an interface-specific port helper using the interface statement with a Layer

3 interface name, and the server statement. The port helper listens for incoming traffic

only from the configured interface to forward to the configured server. For example:

set forwarding-options helpers port 1064 interface ge-0/0/3 server 192.0.2.50

For any scope, optionally use the description statement to label or describe the configured

forwarding service.

In releases prior to Junos OS Release 17.2, you can configure only one destination server

for a given port number. Starting in Junos OS Release 17.2R1, you can configure forwarding

traffic to multiple servers for a given port in any port helper scope. To configure forwarding

the traffic on a specified port to multiple destination servers, include multiple configuration

items for the port and each server (or interface and server). For example, in the global

scope:

set forwarding-options helpers port 1300 server 10.20.30.4

set forwarding-options helpers port 1300 server 10.20.30.5

set forwarding-options helpers port 1300 server 10.20.30.6

To temporarily disable listening on a configured port from a configured interface, include

the no-listen option with the configured item, as follows:

set forwarding-options helpers port port-number interface interface-name server address

no-listen

To remove a configured port helper service from a router or switch, delete the configured

port number item, as follows:

delete forwarding-options helpers port <port-number>

If multiple servers are configured for a particular port, to remove any or all such forwarding

services, you must delete each configured port and server item individually. For example:

delete forwarding-options helpers port 1300 server 10.20.30.4

delete forwarding-options helpers port 1300 server 10.20.30.5

delete forwarding-options helpers port 1300 server 10.20.30.6

Release History Table DescriptionRelease

Starting in Junos OS Release 17.2R1, you can configure forwarding traffic

to multiple servers for a given port in any port helper scope.

17.2R1

Documentation

• port (Packet Forwarding) on page 332

• server (DNS, Port, and TFTP Service) on page 285

• interface (DNS, Port, and TFTP Packet Forwarding or Relay Agent) on page 330

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