Juniper EX3400 Features Manual page 154

DHCP and Other System Services Feature Guide for EX2300, EX3400, and EX4300 Switches
Release History Table
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Documentation
134
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
3 interface name, and the
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
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 option with the configured item, as follows:
no-listen
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 Description
17.2R1 Starting in Junos OS Release 17.2R1, you can configure forwarding traffic
to multiple servers for a given port in any port helper scope.
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
server statement. The port helper listens for incoming traffic
description statement to label or describe the configured
statement with a Layer
interface
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