Licensing Requirements and Limitations for ND Snooping

Involved Network Elements

Other network elements are not required.

Licensing Requirements

ND snooping is a basic feature of a switch and is not under license control.

Feature Support in V200R019C10

All models of S2720, S5700, and S6700 series switches support ND Snooping.

For details about software mappings, visit Hardware Query Tool and search for the desired product model.

Feature Limitations

The S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731S-H, S5731-S, S5731S-S, S6720-EI, S6720-HI, S6720S-EI, S5732-H, S6730-H, S6730S-H, S6730-S,?and S6730S-S support configuration of ND snooping and adding double tags to untagged packets.

The device generates an ND snooping binding entry when receiving a DAD NS packet from a user. When a unicast IPv6 address is added to a user terminal, a DAD NS packet is sent to detect the IPv6 address conflict. After the address is successfully added, no DAD NS packet is sent. When the network adapter is restarted or network cables are removed and installed on the user terminal, Up event of the interface through which the device connects to the terminal is delayed to be reported and STP detection is performed on the interface by default. During this process, the interface cannot forward the DAD NS packet sent by the terminal and discards the packet. As a result, the device cannot generate an ND snooping binding entry. To avoid this issue, run the carrier up-hold-time 0 command to set the delay in reporting the interface Up event to 0 and run the stp disable command to disable the STP function on the interface.