DHCP Relay Commands
page 32-30 OmniSwitch 6250 CLI Reference Guide November 2009
ip helper dhcp-snooping port
Configures the DHCP Snooping trust mode for the port. The trust mode determines if the port will accept
all DHCP traffic, block all DHCP traffic, or accept only client DHCP traffic.
ip helper dhcp-snooping port slot1/port1[-port1a] {block | client-only | trust}
Syntax Definitions
slot1/port1[-port1a] Specifies the slot number for the module and the physical port number
on that module (e.g. 3/1 specifies port 1 on slot 3). Use a hyphen to
specify a range of ports (e.g. 3/1-16).
block Blocks all DHCP traffic on the port.
client-only Allows only DHCP client traffic on the port.
trust Allows all DHCP traffic on the port. The port behaves as if DHCP
Snooping was not enabled.
Defaults
By default, the trust mode for a port is set to client-only when the DHCP Snooping feature is enabled for
the switch or for a VLAN.
Platforms Supported
OmniSwitch 6250
Usage Guidelines
• The DHCP trust mode only applies when the DHCP Snooping feature is enabled for the switch or for a
VLAN.
• If DHCP Snooping is enabled at the switch level, the trust mode applies to all switch ports.
• If DHCP Snooping is enabled for a specific VLAN, then the trust mode applies to only those ports that
are associated with that VLAN.
• Use the show ip helper dhcp-snooping port command to display the current trust mode for a port and
statistics regarding the number of packets dropped due to DHCP Snooping violations.
Examples
-> ip helper dhcp-snooping port 1/24 trust
-> ip helper dhcp-snooping port 2/1-10 block
-> ip helper dhcp-snooping port 4/8 client-only
Release History
Release 6.6.1; command was introduced.
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