D-Link DGS-1510/ME Series Reference Manual page 291

DGS-1510/ME Series Metro Ethernet Switch CLI Reference Guide
DGS-1510-28XMP/ME:admin# show address_binding ip_mac all
Command: show address_binding ip_mac all
M(Mode) - D:DHCP, S:Static ACL - A:Active I:Inactive
IP Address
--------------------------------------- ----------------- -- -- ---------------
10.1.1.1
Total Entries : 1
DGS-1510-28XMP/ME:admin#
32-9 enable address_binding dhcp_snoop
Description
This command is used to enable DHCP snooping mode.
By default, DHCP snooping is disabled.
If a user enables DHCP Snooping mode, all ports which have IMPB disabled will become server ports. The switch
will learn the IP addresses through server ports (by using DHCP Offer and DHCP ACK packets).
Note that the DHCP discover packet cannot be passed thru the user ports if the allow_zeroip function is disabled
on the port.
The auto-learned IMPB entry will be mapped to a specific source port based on the MAC address learning function.
This entry will be created as an IP-Inspection mode binding entry for this specific port. Each entry is associated
with a lease time. When the lease time has expires, the expired entry will be removed from the 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.
If a situation occurs where a binding entry learned by DHCP snooping conflicts with a statically configured entry.
The binding relation has conflicted. For example, if IP A is bound to MAC X with a static configuration and suppose
that the binding entry learned by DHCP snooping is that IP A is bound to MAC Y, and then it is conflict. When the
DHCP snooping learned entry binds with the static configured entry, and the DHCP snooping learned entry will not
be created.
In a situation where the same IMPB pair has been statically configured, the auto-learned entry will not be created.
In a situation where the learned information is consistent with the statically configured entry the auto-learned entry
will not be created. In a situation where the entry is statically configured in ARP mode the auto learned entry will
not be created. In a situation where the entry is statically configured on one port and the entry is auto-learned on
another port, the auto-learned entry will not be created.
Format
enable address_binding dhcp_snoop
Parameters
None.
Restrictions
Only Administrators, Operators and Power-Users can issue this command.
MAC Address M
00-00-00-00-00-11 S
287
ACL Ports
I 1-28