Packet check principles

Switch B checks DHCPv6 protocol packets from DHCPv6 clients against link-local address ND snooping entries, checks ND protocol packets against link-local address ND snooping entries, DHCPv6 snooping entries, and static binding entries, and checks the IPv6 data packets from the clients against dynamic binding entries (including link-local address ND snooping entries and DHCPv6 snooping entries) applied on the interfaces connected to the clients and against static binding entries. The items to be examined include MAC address, IPv6 address, VLAN information, and ingress port.