Apply ip dhcp snooping trust on all interfaces with dynamic addresses.
Enable DHCP snooping for all VLANs that are associated with the switch.
Disable Option 82 for DHCP data insertion
Use IP Source Guard to protect the DHCP binding table entries from being lost upon rebooting.
A DHCP snooping database agent should be configured
Disable DHCP snooping information option
Trust the interface that is connected to the server with the ip dhcp snooping trust command
Verify the source MAC address of all untrusted interfaces with ip dhcp snooping verify mac- address command
Configure a static DHCP snooping binding entry on the switch.
Traffic will pass accordingly after the new IP address is populated into the binding database.
The packets originating from the workstation are assumed to be spoofed and will be discarded.
The interface that is connected to the workstation in question will be put into the errdisabled state.
Packets from the workstation will be rate limited according to the default values set on the switch
The DHCP client interfaces have storm control configured.
Static DHCP bindings are not configured on the switch.
DHCP snooping must be enabled on all VLANs, even if they are not utilized for dynamic address allocation.
The DHCP server does not support information option 82.
The switch is configured for sdm prefer routing as the switched database management template.
The configured SVIs on the switch have been removed for the associated interfaces
The interfaces are configured as Layer 3 using the no switchport command.
No VLANs exist on the switch and/or the switch is configured in VTP transparent mode.
The local DHCP server is disabled prior to enabling IP Source Guard.
switch# show port-security
switch# show mac address-table
switch# show ip verify source
switch#show mac address-table address <mac address>
switch# show ip arp inspection
trusted hosts with available IP addresses
untrusted hosts with leased IP addresses
trusted hosts with leased IP addresses
untrusted hosts with available IP addresses
Dynamic ARP Inspection
DHCP snooping
storm control
VTP pruning
ip dhcp snooping trust
ip dhcp snooping information
ip dhcp snooping
ip dhcp trust
dynamic routing database
DHCP snooping database
static ARP database
dynamic ARP database
private VLAN
spanning-tree portfast
A sticky MAC address is lost when the switch reboots.
A sticky MAC address can be a unicast or multicast address.
A sticky MAC address ages out of the MAC address table after 600 seconds.
A sticky MAC address is retained when the switch reboots.
Layer 3
Layer 7
Layer 1
Layer 2
5000 bindings
2000 bindings
1000 bindings
8000 bindings
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