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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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Configuring a User-Defined Flow

Configuring a User-Defined Flow


You can bind an ACL to a user-defined flow to specify characteristics of attack flows. When unknown attacks occur on the network, the device can identify attack data flows and limit the rate of data flows with the specified characteristics.


If a blacklist and a user-defined flow reference the same ACL, the blacklist takes effect. If a whitelist and a user-defined flow reference the same ACL, the whitelist takes effect. For details, see Configuring the Whitelist.


  1. Run system-view

    The system view is displayed.

  2. Run cpu-defend policy policy-name

    The attack defense policy view is displayed.

  3. Run user-defined-flow flow-id acl acl-number

    A user-defined flow is configured.

    The ACL referenced by a user-defined flow can be a basic ACL, an advanced ACL, or a Layer 2 ACL. For details on how to create an ACL, see ACL Configuration.

    By default, no user-defined flow is configured.


    If the ACL applied to a user-defined flow includes a permit rule, the device uses the default value 64 kbit/s to limit the rate of packets matching the ACL. If the action for the user-defined flow is deny, the device discards the packets matching the ACL. If the ACL applied to a user-defined flow includes a deny rule, the device discards the packets matching the ACL.

    If an ACL has no rule, the user-defined flow that references the ACL does not take effect.

    If packets match both a whitelist that references an ACL with a permit rule and a user-defined flow, the user-defined flow does not take effect for the packets. The device limits the rate of these packets using the CPCAR value configured for the corresponding protocol.

Updated: 2019-04-01

Document ID: EDOC1000178319

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