icmpv6-flood threshold

Use icmpv6-flood threshold to set the global threshold for triggering ICMPv6 flood attack prevention.

Use undo icmpv6-flood threshold to restore the default.


icmpv6-flood threshold threshold-value

undo icmpv6-flood threshold


The global threshold is 1000 for triggering ICMPv6 flood attack prevention.


Attack defense policy view

Predefined user roles




threshold-value: Specifies the threshold value. The value range is 1 to 1000000 in units of ICMPv6 packets sent to an IP address per second.

Usage guidelines

With global ICMPv6 flood attack detection configured, the device is in attack detection state. When the sending rate of ICMPv6 packets to an IPv6 address reaches the threshold, the device enters prevention state and takes the specified actions. When the rate is below the silence threshold (three-fourths of the threshold), the device returns to the attack detection state.

The global threshold applies to global ICMPv6 flood attack detection. Adjust the threshold according to the application scenarios. If the number of ICMPv6 packets sent to a protected server, such as an HTTP or FTP server, is normally large, set a large threshold. A small threshold might affect the server services. For a network that is unstable or susceptible to attacks, set a small threshold.


# Set the global threshold to 100 for triggering ICMPv6 flood attack prevention in attack defense policy atk-policy-1.

<Sysname> system-view
[Sysname] attack-defense policy atk-policy-1
[Sysname-attack-defense-policy-atk-policy-1] icmpv6-flood threshold 100

Related commands

icmpv6-flood action

icmpv6-flood detect ipv6

icmpv6-flood detect non-specific