Users Guide

Layer 2 Switching Commands 365
MAC address to the DHCP client hardware address. If there is a mismatch,
DHCP snooping logs a message and drops the packet. The network
administrator can disable this option using the no ip v6 dhcp snooping verify
mac-address for DHCPv6. DHCP snooping always forwards client messages
on trusted interfaces within the VLAN. If DHCP relay or/and DHCP server
are enabled simultaneously with DHCP snooping, the DHCP client message
will be sent to the DHCP relay or/and DHCP server to process further.
Example
console(config)#ipv6 dhcp snooping
ipv6 dhcp snooping vlan
Use the ipv6 dhcp snooping vlan command to globally enable IPv6 DHCP on
a set of VLANs. Use the no form of the command to globally disable IPv6
DHCP snooping on a set of VLANs.
Syntax
ipv6 dhcp snooping vlan vlan-list
no ipv6 dhcp snooping vlan-list
• vlan-list —A single VLAN, one or more VLANs separated by commas, or
two VLANs separated by a single dash indicating all VLANs between the
first and second inclusive. Multiple VLAN identifiers can be entered
provided that no embedded spaces are contained within the vlan-list.
Default Configuration
By default, DHCP snooping is not enabled on any VLANs.
Command Modes
Global Configuration mode
User Guidelines
DHCP snooping must be enabled on at least one VLAN and globally enabled
to become operational.
Example
console(config)#ipv6 dhcp snooping