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Configuration Guide - IP Service
S1720, S2700, S5700, and S6720 V200R011C10

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.

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Example for Configuring UDP Helper

Example for Configuring UDP Helper

Networking Requirements

As shown in Figure 9-2, the IP address of VLANIF 100 on the Switch is, and the IP address of the NetBIOS-NS server is The Switch and NetBIOS-NS server are on different network segments, and a reachable route exists between them. The PCs need to access each other using host names.

Figure 9-2  UDP helper network

Configuration Roadmap

The configuration roadmap is as follows:

Relay the UDP packets with destination port 137 and destination address and the UDP packets with destination address to the specified NetBIOS-NS server.

When the Switch receives a broadcast NetBIOS-NS Register packet, it changes the destination IP address in the IP header of the broadcast packet to the IP address of the NetBIOS-NS server and forwards the packet to the NetBIOS-NS server.

After UDP helper is enabled on the Switch, the Switch relays the broadcast packets with UDP destination port 137 by default. The UDP port number, therefore, does not need to be configured in this example.


  1. Enable UDP helper.

    <HUAWEI> system-view
    [HUAWEI] sysname Switch
    [Switch] udp-helper enable

  2. Configure a destination server.

    [Switch] vlan 100
    [Switch-vlan100] quit
    [Switch] interface vlanif 100
    [Switch-Vlanif100] ip address 16
    [Switch-Vlanif100] udp-helper server
    [Switch-Vlanif100] quit
    [Switch] quit

  3. Verify the configuration.

    The destination server configured on VLANIF 100 is the NetBIOS-NS server.

    <Switch> display udp-helper server interface vlanif 100
    vlan-interface        Server-Ip        packet-num
    Vlanif100                     0

Configuration Files

Switch configuration file

sysname Switch
vlan batch 100
udp-helper enable
interface Vlanif100
 ip address
 udp-helper server
Updated: 2020-02-26

Document ID: EDOC1000178170

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