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CLI-based Configuration Guide - IP Service

AR500, AR510, AR531, AR550, AR1500, and AR2500 V200R010

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.

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Configuring UDP Helper

Configuring UDP Helper

The UDP helper function relays the UDP broadcast packets destined for specified ports.

Pre-configuration Tasks

Before configuring UDP helper, complete the following task:

  • Configuring a reachable route from the industrial switch router to the destination server



  1. Run system-view

    The system view is displayed.

  2. Run udp-helper enable

    UDP helper is enabled.

  3. (Optional) Run udp-helper port { port-number | dns | netbios-ds | netbios-ns | tacacs | tftp | time }

    The UDP destination port to which UDP broadcast packets are relayed is specified.


    After UDP helper is enabled, the industrial switch router relays the UDP packets with the following destination ports by default: Time (37), TACACS (49), DNS (53), TFTP (69), NetBIOS-NS (137), and NetBIOS-DS (138). If the UDP destination port you want to specify is among the six ports, skip this step.

  4. Run interface interface-type interface-number

    The interface view is displayed.

    The interface must be a VLANIF interface, Layer 3 Ethernet interface, or Layer 3 Ethernet sub-interface.

  5. Run udp-helper server ip-address

    The destination server for UDP helper is specified.

Verifying the Configuration

  • Run the display udp-helper port command to check the UDP port numbers of the packets that need to be relayed.
Updated: 2019-05-20

Document ID: EDOC1100034231

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