DGS-3710 Series Layer 2 Managed Gigabit Switch CLI Reference Guide
324
The auto-learned IP-MAC-Port binding entry will be mapped to a specific source port based on the
MAC address learning function. This entry will be created as an ACL-mode binding entry for this
specific port. Each entry is associated with a lease time. When the lease time expires, the expired
entry will be removed from this port. The auto-learned binding entry can be moved from one port to
another port if the DHCP snooping function has learned that the MAC address has moved to a
different port.
Consider the case in which a binding entry learned by DHCP snooping conflicts with the statically
configured entry. This means that the binding relation is in conflict. For example, if IP A is binded
with MAC X by static configuration, suppose that the binding entry learned by DHCP snooping is
IP A binded by MAC Y, then there is a conflict. When the DHCP snooping learned entry is binded
with the static configured entry, then the DHCP snooping learned entry will not be created.
Consider the other conflict case, when the DHCP snooping learned a binding entry, and the same
IP-MAC-Port binding pair has been statically configured. If the learned information is consistent
with the statically configured entry, then the auto-learned entry will not be created. If the entry is
statically configured in ARP mode, then the auto learned entry will not be created. If the entry is
statically configured on one port and the entry is auto-learned on another port, then the auto-
learned entry will not be created either.
Format
enable address_binding dhcp_snoop {[ipv6 | all]}
Parameters
ipv6
– (Optional) Specifies to enable the IPv6 address binding DHCP snoop mode.
all
– Specifies to enable the IPv6 and IPv4 address binding DHCP snoop mode.
Restrictions
Only Administrator and Operator-level users can issue this command.
Example
To enable the address binding DHCP snooping mode:
DGS-3710-12C:admin#enable address_binding dhcp_snoop
Command: enable address_binding dhcp_snoop
Success.
DGS-3710-12C:admin#
30-14
disable address_binding dhcp_snoop
Description
This command is used to disable address binding DHCP snooping. When DHCP snooping is
disabled, all of the auto-learned binding entries will be removed.