DHCP Snooping Binding Database

Note the following points about maintenance of the DHCP Snooping Binding database:

  • The device doesn’t update the DHCP Snooping Binding database when a station moves to another interface.

  • If a port is down, the entries for that port aren’t deleted.

  • When DHCP Snooping is disabled for a VLAN, the binding entries that collected for that VLAN are removed.

  • If the database is full, DHCP Snooping continue to forward packets but new entries aren’t created. Note that if the IP source guard and/or ARP inspection features are active, the clients that aren’t written in the DHCP Snooping Binding database aren’t been able to connect to the network.

To add entries to the DHCP Snooping Binding database, follow these steps:

Procedure

Step 1

Click IPv4 Configuration > DHCP Snooping /Relay > DHCP Snooping Binding Database.

The fields in the DHCP Snooping Binding Database are displayed for the IP Source Guard:

  • Status

    • Active—IP Source Guard is active on the device.

    • Inactive—IP Source Guard isn't active on the device.

  • Reason

    • No Problem

    • No Resource

    • No Snoop VLAN

    • Trust Port

Step 2

To add an entry, click Add. The supported address type is IPv4.

Step 3

Enter the fields:

  • VLAN ID—VLAN on which packet is expected.

  • MAC Address—MAC address of packet.

  • IP Address—IP address of packet.

  • Interface—Unit/Slot/Interface on which packet is expected.

  • Type—The possible field values are:

    • Dynamic—Entry has limited lease time.

    • Static—Entry was statically configured.

  • Lease Time—If the entry is dynamic, enter the amount of time that the entry is to be active in the DHCP Database. If there’s no Lease Time, check Infinite.)

Step 4

Click Apply. The settings are defined, and the device is updated.

Step 5

Click Clear Dynamic to delete the configuration.