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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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(Optional) Enabling DHCP Snooping

(Optional) Enabling DHCP Snooping

Background Information

DHCP snooping monitors Layer 2 DHCP services. Devices use DHCP snooping to monitor DHCP-REQUEST messages sent by the client and DHCP-ACK messages received by the trusted interface and sets up DHCP snooping entries that record clients' information. The information includes MAC addresses of clients, IP addresses obtained, interfaces connected to DHCP clients, and VLANs that the interfaces belong to.

Layer 2 proxy ARP entries can be either DHCP snooping entries or ARP snooping entries,
  • If DHCP snooping is enabled, Layer 2 proxy ARP entries are DHCP snooping entries and ARP snooping entries.

  • If DHCP snooping is disabled, Layer 2 proxy ARP entries are only ARP snooping entries.

Procedure

  • Enabling DHCP snooping in the VLAN view
    1. Run system-view

      The system view is displayed.

    2. Run dhcp enable

      DHCP is enabled globally.

      By default, DHCP is disabled globally.

    3. Run dhcp snooping enable

      DHCP snooping is enabled globally.

      By default, DHCP snooping is disabled globally.

    4. Run vlan vlan-id

      The VLAN view is displayed.

    5. Run dhcp snooping enable

      DHCP snooping is enabled in a VLAN.

      By default,DHCP snooping is disabled in a VLAN.

    6. Run quit

      Return to the system view.

    7. (Optional) Disable the DHCP snooping function for a specific interface in a VLAN.

      1. Run interface interface-type interface-number

        The interface view is displayed.

      2. Run dhcp snooping disable

        DHCP snooping is disabled for an interface in the VLAN.

    8. Run commit

      The configuration is committed.

  • Enabling DHCP snooping in the interface view
    1. Run system-view

      The system view is displayed.

    2. Run dhcp enable

      DHCP is enabled globally.

      By default, DHCP is disabled globally.

    3. Run dhcp snooping enable

      DHCP snooping is enabled globally.

      By default, DHCP snooping is disabled globally.

    4. Run interface interface-type interface-number

      The interface view is displayed.

    5. Run dhcp snooping enable

      DHCP snooping is enabled on an interface.

      By default, DHCP snooping is disabled on an interface.

    6. Run commit

      The configuration is committed.

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Updated: 2019-05-08

Document ID: EDOC1100004354

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