Fundamentals of DHCPv6 Snooping

A device enabled with DHCPv6 snooping can generate DHCPv6 snooping binding entries based on the packet information received on interfaces. The DHCPv6 snooping binding table is key in DHCPv6 snooping as it holds the basic information used for checking packets.

DHCPv6 Snooping Binding Table

A DHCPv6 snooping binding table is a combination of information about access users. The information includes the IPv6 address, MAC address, interface information, and VLAN ID. DHCPv6 snooping binding tables can be dynamic or static. Dynamic binding entries are automatically generated after DHCPv6 snooping is enabled, whereas static binding entries are manually configured.

Dynamic DHCPv6 snooping binding table
For users who dynamically obtain IPv6 addresses through DHCPv6, DHCPv6 snooping binding entries can be dynamically generated based on the information allocated to users by the DHCPv6 server.
Static DHCPv6 snooping binding table
For a static IPv6 user, a static DHCPv6 snooping binding entry can be configured using the corresponding command based on the user's IPv6 address and MAC address, ID of the VLAN to which the user belongs, and the information about the interface that the user utilizes for communication.

Aging of DHCPv6 snooping binding entries:

If the lease of an IPv6 address in a dynamic binding table expires, the binding entry corresponding to this IPv6 address will be deleted.
A static binding entry can only be deleted by using the corresponding command.