Chapter 17: DHCP Snooping Commands
314 Section III: Layer 2 Switching
ENABLE DHCPSNOOPING
Syntax
enable dhcpsnooping
Parameters
None
Description
Use this command to enable DHCP Snooping and start snooping DHCP
messages between DHCP servers and clients. By default, DHCP
Snooping is disabled.
When DHCP Snooping is enabled:
When the DHCP server assigns an IP address to a client, the
switch adds the client connected to an untrusted port to the DHCP
Snooping table.
Untrusted ports permit IP packets from the clients listed in the
DCHP Snooping table and discard the rest of the packets.
Here are the guidelines for DHCP Snooping:
The switch writes client information in NVS into the DHCP
Snooping table when starts DCHP Snooping.
The switch filters DCHP messages between the DHCP server and
DHCP clients connected to the untrusted port.
DCHP Snooping and STP cannot be enabled at the same time.
DHCP Snooping and Policy-based QoS cannot be enabled at the
same time.
Untrusted ports cannot be trunk ports, Web authenticated, EPSR
aware, or port security enabled port.
One port can have up to 5 DCHP clients.
The GS908M V2 switch can have up to 40 DHCP clients.
The GS908M V2-4PS switch can have up to 45 DHCP clients.
The GS916M V2 switch can have up to 75 DHCP clients.
The GS924M V2 switch can have up to 115 DHCP clients.
Confirmation Command
“SHOW DHCPSNOOPING” on page 328
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