C
HAPTER
24
| General Security Measures
DHCPv4 Snooping
– 900 –
ports within the VLAN according to the default status, or as specifically
configured for an interface with the no ip dhcp snooping trust
command.
â—† When an untrusted port is changed to a trusted port, all the dynamic
DHCP snooping bindings associated with this port are removed.
◆ Additional considerations when the switch itself is a DHCP client – The
port(s) through which it submits a client request to the DHCP server
must be configured as trusted.
EXAMPLE
This example sets port 5 to untrusted.
Console(config)#interface ethernet 1/5
Console(config-if)#no ip dhcp snooping trust
Console(config-if)#
RELATED COMMANDS
ip dhcp snooping (892)
ip dhcp snooping vlan (897)
clear ip dhcp
snooping binding
This command clears DHCP snooping binding table entries from RAM. Use
this command without any optional keywords to clear all entries from the
binding table.
SYNTAX
clear ip dhcp snooping binding [mac-address vlan vlan-id]
mac-address - Specifies a MAC address entry.
(Format: xx-xx-xx-xx-xx-xx)
vlan-id - ID of a configured VLAN (Range: 1-4094)
COMMAND MODE
Privileged Exec
EXAMPLE
Console(config)#clear ip dhcp snooping binding 11-22-33-44-55-66 vlan 1
Console(config)#
clear ip dhcp
snooping database
flash
This command removes all dynamically learned snooping entries from flash
memory.
COMMAND MODE
Privileged Exec
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