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Configuration Guide - Security

S7700 and S9700 V200R011C10

This document describes the configurations of Security, including ACL, reflective 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, separating the management plane from the service plane, security risks.
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(Optional) Setting the Time for Listening to the Duplicate Address Detection Performed by the DHCPv6 Client

(Optional) Setting the Time for Listening to the Duplicate Address Detection Performed by the DHCPv6 Client

Context

The time for listening to the duplicate address detection performed by the DHCPv6 client can be set only in DHCPv6-Only scenarios or DHCPv6+SLAAC scenarios.

After detecting that the DHCPv6 client obtains the IPv6 address, the device detects whether the DHCPv6 client sends an NS packet for duplicate address detection.

  • In DHCPv6-Only scenarios:
    • If no NS packet in the DAD process is detected in the configured listening period, the device sets the DHCPv6 snooping entry to the bound state. It indicates that the DHCPv6 does not perform the duplicate address detection on the obtained IPv6 address or no duplicate IPv6 address exists.
    • If an NS packet in the DAD process is detected in the configured listening period, the device does not change the status of the mapping DHCPv6 snooping entry. The device sets the DHCPv6 snooping entry to the bound state only when the listening period expires.

    In DHCPv6-Only scenarios, when detecting the DHCPv6 Decline packet or DHCPv6 Release packet from the DHCPv6 client, the device deletes the corresponding DHCPv6 snooping entry.

  • In DHCPv6+SLAAC scenarios:
    • If no NS packet in the DAD process is detected in the configured listening period, the device sets the DHCPv6 snooping or ND snooping entry to the bound state. It indicates that the client does not perform the duplicate address detection on the obtained IPv6 address or no duplicate IPv6 address exists, and the client can use this IPv6 address.
    • If an NS packet in the DAD process is detected in the configured listening period, the device sets the mapping DHCPv6 snooping or ND snooping entry to the detection state, and listens to the mapping NA packet. For the listening method, see (Optional) Setting the Time for Listing to an NA Packet in Response to Duplicate Addresses.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run savi max dad-prepare-delay value

    Time for listening to the duplicate address detection performed by the DHCPv6 client is set.

    By default, the time for listening to the duplicate address detection performed by the DHCPv6 client is 2 seconds.

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Updated: 2019-04-01

Document ID: EDOC1000178319

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