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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Maintaining DHCP Snooping

Maintaining DHCP Snooping

You can clear DHCP snooping statistics and dynamic binding table or back up the DHCP snooping binding table.

Clearing DHCP Snooping Statistics

Context

The cleared statistics cannot be restored. Exercise caution when you run the command.

Procedure

  • Run the reset dhcp snooping statistics global command in the user view to clear statistics on globally discarded DHCP messages.
  • Run the reset dhcp snooping statistics interface interface-type interface-number [ vlan vlan-id ] command in the user view to clear statistics on discarded DHCP messages on an interface.
  • Run the reset dhcp snooping statistics vlan vlan-id [ interface interface-type interface-number ] command in the user view to clear statistics on discarded DHCP messages in a VLAN.

Clearing Dynamic DHCP Snooping Binding Entries

Context

After the networking environment changes, DHCP snooping binding entries do not age immediately. The following information in DHCP snooping binding entries may change, causing packet forwarding failure:
  • VLAN that a DHCP client belongs to.
  • Interface to which DHCP clients are connected.
Before changing the networking environment, clear all DHCP snooping binding entries manually so that the device generates a new DHCP snooping binding table according to the new networking environment.

After dynamic DHCP snooping binding entries are cleared, all the DHCP users connected to the device need to re-log in. Exercise caution when you run the command.

Procedure

  • Run the reset user-bind dhcp snooping [ { vlan vlan-id | interface interface-type interface-number ] * | ip-address ip-address } command in the user view to clear dynamic DHCP snooping binding entries.

Backing Up DHCP Snooping Binding Entries

Context

If binding entries are not backed up, the binding entries will be lost after the device restarts. DHCP users must log in again so that the device can generate DHCP snooping binding entries for DHCP users to communicate. After DHCP snooping binding entries are backed up, DHCP snooping binding entries can be restored after the device restarts.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    dhcp snooping user-bind autosave file-name

    The device is enabled to back up dynamic DHCP snooping binding entries.

    By default, local automatic backup of the DHCP snooping binding table is disabled.

  3. Run:

    commit

    The configuration is committed.

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Updated: 2019-08-09

Document ID: EDOC1000041694

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