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Configuration Guide - Security

S1720, S2700, S5700, and S6720 V200R011C10

This document describes the configurations of Security, including ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, Port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, URPF, keychain, MPAC, separating the management plane from the service plane, security risks, PKI.
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(Optional) Enabling Automatic User Status Detection for Users Mapping ND Snooping Dynamic Binding Entries

(Optional) Enabling Automatic User Status Detection for Users Mapping ND Snooping Dynamic Binding Entries

Context

After ND snooping is enabled, the device snoops NS packets in the DAD process to establish ND dynamic binding entries. The aging time of an ND snooping dynamic binding table depends on the IPv6 address lease. If the address lease does not expire but the user is offline, the ND snooping dynamic entry mapping the user cannot be deleted, which occupies binding entry resources on the device.

To prevent this problem, you can enable the automatic user status detection for users mapping ND snooping dynamic binding entries on the device. After this function is enabled, the device sends NS packets to the user according to the detection times (n) specified in nd user-bind detect and detection interval. If the device receives no NA packet from the user after sending the NS packets n times, the device considers that the user offline and deletes the dynamic ND snooping binding entry matching the user.

On a small network with good network quality, the user returns an NA packet quickly. In this scenario, you can set the interval for sending NS packets to a small value. On a large network with poor network quality, the user returns an NA packet slowly. You can set the interval to a large value to prevent the device from sending the next NS packet before receiving the NA packet. You can change the interval based on the actual network environment.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run nd user-bind detect enable

    The automatic user status detection is enabled for users mapping ND snooping dynamic binding entries.

    By default, the automatic user status detection is disabled for users mapping ND snooping dynamic binding entries.

  3. (Optional) Run nd user-bind detect retransmit retransmit-times interval retransmit-interval

    Number of times and interval for sending NS packets to detect the user status are set.

    By default, the number of detection times is 2, and the detection interval is 1000 milliseconds.

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Updated: 2019-03-28

Document ID: EDOC1000178177

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