7. Setup DHCP snooping/relay sub-commands
Switch(config-if-PORT-PORT)#
ip dhcp snooping option
Enable the selected interfaces’ DHCP
Option 82 / DHCPv6 Option 37 relay
agent globally.
Switch(config-if-PORT-PORT)#
ip dhcp snooping circuit
Enable the selected interfaces’ DHCP
Option 82 / DHCPv6 Option 37 Manual
Circuit Id.
Switch(config-if-PORT-PORT)#
ip dhcp snooping circuit
formatted
Enable Formatted Option 82 / DHCPv6
Option 37 Circuit Id for the selected
interfaces.
Switch(config-if-PORT-PORT)#
ip dhcp snooping circuit id
[circuit_id]
Specify the VLAN and port identifier using
a VLAN ID in the range of 1 to 4094.
Besides, you can configure the circuit ID
to be a string of up to 63 characters.
Switch(config-if-PORT-PORT)#
ip dhcp snooping trust
Enable the selected interfaces as DHCP
Option 82 / DHCPv6 Option 37 trust ports.
Switch(config-if-PORT-PORT)#
ip dhcp snooping server-trust
Enable the selected interfaces as
DHCP/DHCPv6 server trust ports.
Note : A port / ports cannot be
configured as option 82 trust and
server trust at the same time.
Switch(config-if-PORT-PORT)#
no ip dhcp snooping option
Disable the selected interfaces’ DHCP
Option 82 / DHCPv6 Option 37 relay
agent.
Switch(config-if-PORT-PORT)#
no ip dhcp snooping trust
Reset the selected interfaces back to non-
DHCP Option 82 / DHCPv6 Option 37
trust ports.
Switch(config-if-PORT-PORT)#
no ip dhcp snooping server-trust
Reset the selected interfaces back to non-
DHCP/DHCPv6 server trust ports.
Switch(config-if-PORT-PORT)#
no ip dhcp snooping circuit
Disable the selected interfaces’ DHCP
Option 82 / DHCPv6 Option 37 Manual
Circuit Id.
Switch(config-if-PORT-PORT)#
no ip dhcp snooping circuit id
Clear DHCP Option 82 / DHCPv6 Option
37 Circuit Id.
Switch(config-if-PORT-PORT)#
no ip dhcp snooping circuit
formatted
Disable Formatted Option 82 / DHCPv6
Option 37 Circuit Id for the selected
interfaces.
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