nd snooping check dad-ns retransmit-rate enable

Function

The nd snooping check dad-ns retransmit-rate enable command enables the function of checking the retransmission rate of DAD NS packets.

The undo nd snooping check dad-ns retransmit-rate enable command disables the function of checking the retransmission rate of DAD NS packets.

By default, the function of checking the retransmission rate of DAD NS packets is disabled.

Format

nd snooping check dad-ns retransmit-rate enable

undo nd snooping check dad-ns retransmit-rate enable

Parameters

None

Views

System view, VLAN view, Eth-Trunk view, Ethernet interface view, GE interface view, XGE interface view, 25GE interface view, MultiGE interface view, 40GE interface view, 100GE interface view, port group view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

If an untrusted interface on a device receives a DAD NS packet, the interface forwards the packet for the duplicate address detection and bogus user check. To avoid the situation that the remote interface cannot receive packets forwarded by the local device because of packet loss when the ND snooping binding entry is not established, configure the untrusted interface on the local device to forward a DAD NS packet after receiving it. By default, a device does not control the retransmission rate of DAD NS packets. When excessive packets are received, packet retransmission may affect normal operation of network services. To solve this problem, you can run the nd snooping check dad-ns retransmit-rate enable command to enable the function of checking the retransmission rate of DAD NS packets. After this function is enabled, the device limits the retransmission rate of DAD NS packets.

You can run the nd snooping check dad-ns retransmit-rate rate rate-value command to configure the retransmission rate of DAD NS packets. If the number of DAD NS packets retransmitted per second exceeds the value of the rate-value parameter, the device directly discards excessive packets instead of forwarding these packets.

Prerequisites

ND snooping has been enabled using the nd snooping enable command in the system view.

Example

# Enable the function of checking the retransmission rate of DAD NS packets in the system view.

<HUAWEI> system-view
[HUAWEI] nd snooping enable
[HUAWEI] nd snooping check dad-ns retransmit-rate enable