Juniper EX3400 Features Guide

CHAPTER 11
Configuring Packet Forwarding Options
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Configuring Port-based LAN Broadcast Packet Forwarding on page 133
Configuring Port-based LAN Broadcast Packet Forwarding
You can enable a router or switch to forward LAN broadcast traffic on custom UDP ports
to specified servers by configuring port helpers with the [edit forwarding-options helpers]
port configuration statement. Port helpers are also referred to as port forwarding or UDP
broadcast packet forwarding services. When you configure a port helper, the router or
switch listens for incoming UDP traffic for the configured port with destination Layer 2
MAC and Layer 3 IP broadcast addresses, and forwards the packets as unicast traffic to
a configured server.
Port helpers forward the traffic for configured ports transparently, without considering
the application layer protocols in the packets being forwarded. However, you cannot
configure a port helper to forward traffic for standard ports used by services such as
BOOTP, DNS and TFTP. These services have their own explicit packet forwarding helper
configuration options (see helpers and Configuring DNS and TFTP Packet Forwarding).
You can configure port helpers to listen for and forward broadcast traffic for a configured
port using any of the following scopes:
•
Global scope—Forward incoming broadcast traffic on the port to a configured
destination server IP address.
Configure a global port helper using only the server configuration option, without
specifying a particular interface. The port helper listens for incoming traffic on any
interfaces to forward to the configured server. For example:
set forwarding-options helpers port 1300 server 10.20.30.40
•
VLAN-specific scope—Forward incoming broadcast traffic on the port from a configured
VLAN to a configured destination server IP address.
Configure a VLAN-specific port helper using the interface statement with an IRB
interface name for a VLAN, and the server statement. The port helper listens for
incoming traffic from interfaces in the VLAN to forward to the configured server. For
example:
set forwarding-options helpers port 1064 interface irb.100 server 192.0.2.50
133Copyright © 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