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Configuration Guide - IP Service

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
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 switch to the destination server

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ip udp-helper enable

    UDP helper is enabled.

    By default, UDP Helper is disabled.

    NOTE:
    • After UDP Helper is enabled, the device can relay broadcast packets carrying one of the following six default UDP port numbers: 37 (Time), 49 (TACACS), 53 (DNS), 69 (TFTP), 137 (NetBIOS-NS), and 138 (NetBIOS-DS).
    • UDP Helper cannot relay DHCP packets. Specifically, the UDP port number cannot be set to 67 or 68. DHCP relay must be enabled to relay DHCP packets.
    • If the interface number to be configured is not one of the default UDP port numbers, go to Step 3 to configure the UDP port number.
    • If the device does not need to relay broadcast packets carrying one of the following UDP interface numbers: 37 (Time), 49 (TACACS), 53 (DNS), 69 (TFTP), 137 (NetBIOS-NS), and 138 (NetBIOS-DS), go to Step 4.

  3. (Optional) Run ip udp-helper port port-number [ description description ]

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

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

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

  5. Run interface interface-type interface-number

    The interface view is displayed.

    The interface must be a VLANIF interface.

  6. Run ip udp-helper server ip-address

    The destination server for UDP helper is specified.

  7. Run commit

    The configuration is committed.

Verifying the Configuration

  • Run the display ip udp-helper port command to check the UDP port numbers of the packets that need to be relayed.
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Updated: 2019-05-08

Document ID: EDOC1100004354

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