ipv6 nd ns multicast-enable

Function

The ipv6 nd ns multicast-enable command enables a termination sub-interface to send NS multicast packets.

The undo ipv6 nd ns multicast-enable command disables a termination sub-interface from sending NS multicast packets.

By default, a termination sub-interface is disabled from sending NS multicast packets.

Only S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.

Format

ipv6 nd ns multicast-enable

undo ipv6 nd ns multicast-enable

Parameters

None

Views

GE sub-interface view, XGE sub-interface view, MultiGE sub-interface view, 25GE sub-interface view, 40GE sub-interface view, 100GE sub-interface view, Eth-Trunk sub-interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

A termination sub-interface can send NS multicast packets to actively learn ND entries or respond to NS packets to passively learn ND entries.

When a termination sub-interface needs to send multicast NS packets to learn ND entries but there is no corresponding ND entry, you need to run this command to enable a termination sub-interface to send NS multicast packets.

Prerequisites

Run the ipv6 enable command in the sub-interface view to enable IPv6 on a termination sub-interface.

Run the dot1q termination vid command in the sub-interface view to set the single VLAN ID for Dot1q termination. Or run the qinq termination pe-vid ce-vid command in the sub-interface view to configure a QinQ termination sub-interface to terminate double VLAN tags.

Precautions

If this command is not run on the termination sub-interface, the system discards the NS multicast packets.
If this command is run on the termination sub-interface, the system tags an NS multicast packet and forwards it through the termination sub-interface.

Sending multicast NS packets consumes CPU resources. Therefore, when the CPU performance of the system is rather low, you are advised not to enable a termination sub-interface to send NS multicast packets to actively learn ND entries but to respond to NS packets to passively learn ND entries.

VLAN termination sub-interfaces cannot be created on a VCMP client. You can run the vcmp role command to configure the role for a switch in a VCMP domain.

Example

# Enable the Dot1q termination sub-interface GigabitEthernet0/0/1.1 to send NS multicast packets.

<HUAWEI> system-view
[HUAWEI] ipv6
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] port link-type hybrid
[HUAWEI-GigabitEthernet0/0/1] quit
[HUAWEI] interface gigabitethernet 0/0/1.1
[HUAWEI-GigabitEthernet0/0/1.1] ipv6 enable
[HUAWEI-GigabitEthernet0/0/1.1] dot1q termination vid 100
[HUAWEI-GigabitEthernet0/0/1.1] ipv6 nd ns multicast-enable