PLANET XGS3-24040 - Manual (Page 210)

Chapter 28 DHCP Configuration
27-4
PC3: FE80::2CC:FF:FE9A:4CA2, 2001::2CC:FF:FE9A:4CA2, 2001::22:4A:1133:C422;
At the same time, three PCs send the DAD (duplicate address detect) NS packets to the link-local, ND
Snooping module receives DAD NS packets and set up the corresponding dynamic binding table according to
these packets , the table is as follows:
IPv6 address MAC address Port ID
FE80::2AA:FF:FE9A:4CA2 02-AA-00-9A-4C-A2 1/1
2001::2AA:FF:FE9A:4CA2 02-AA-00-9A-4C-A2 1/1
2001::23:4A:1122:C411 02-AA-00-9A-4C-A2 1/1
FE80:: BB:FF:FE9A:4CA2 02-BB-00-9A-4C-A2 1/2
2001::2BB:FF:FE9A:4CA2 02-BB-00-9A-4C-A2 1/2
2001::32:4B:2211:11C4 02-BB-00-9A-4C-A2 1/2
FE80:: CC:FF:FE9A:4CA2 02-CC-00-9A-4C-A2 1/3
2001::2CC:FF:FE9A:4CA2 02-CC-00-9A-4C-A2 1/3
2001::22:4A:1133:C422 02-CC-00-9A-4C-A2 1/3
If three PCs do not receive the responding DAD NA packets in the set time, then port 1/1, port 1/2, port 1/3
send to the FFP hardware drive binding entries according to the dynamic binding table. After that, these port
will detect the source addresses of the received data packet, if it match the binding entries, then the IPv6
packet are allowed to pass, otherwise, the IPv6 packet are denied.
Configuration steps:
SW1:
SW1(config)# ipv6 enable
SW1(config)# ipv6 nd snooping enable
SW1(config)# interface vlan 1
SW1(config-if-vlan1)# ipv6 address 2001::1/64
SW1(config)# interface ethernet 1/1; 1/2; 1/3
SW1(config-if-port-range)# ipv6 nd snooping user-control
SW2:
SW2(config)# ipv6 enable
SW2(config)# interface vlan 1
SW2(config-if-vlan1)# ipv6 address 2001::2/64
SW2(config-if-vlan1)# no ipv6 nd suppress-ra
27.4 ND Snooping Troubleshooting
If there is any problem happens when using ND Snooping, please check whether the problem is caused by
the following reasons:
 Whether ipv6 nd snooping enable is enabled globally and ipv6 nd snooping user-control is configured in
the port.
 Use debug ipv6 nd snooping to check whether the switch can correctly receive and process the relative
packets.