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Configuration Guide - IP Service

S7700 and S9700 V200R013C00

This document describes the configurations of IP service, including IP address, ARP, DHCP, 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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Configuring UDP Helper

Configuring UDP Helper

Pre-configuration Tasks

Before configuring UDP helper, configure a reachable route from the switch to the destination server.

Procedure

  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.

    NOTE:

    After UDP helper is enabled, the switch 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.

  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.
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Updated: 2019-04-20

Document ID: EDOC1100065743

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