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CLI-based Configuration Guide - Security

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides the basic concepts, configuration procedures, and configuration examples in different application scenarios of the network management feature supported by the device.
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Configuring ALP

Configuring ALP


Active link protection (ALP) protects session-based application layer data, including data of SSH sessions, Telnet sessions, SSHv6 Session, Telnetv6 Session, HTTP sessions, BGP sessions, and FTP sessions to ensure uninterrupted services when attacks occur.

The rate limit for packets after ALP is enabled can be set in the attack defense policy view and applied to the LPU or MPU with attack defense policy. The cpu-defend application-apperceive command enables the ALP function.


  1. Run system-view

    The system view is displayed.

  2. Run cpu-defend policy policy-name

    The attack defense policy view is displayed.

  3. (Optional) Run cpu-defend application-apperceive [ ssh | telnet | sshv6 | telnetv6 | bgp | ftp | http ] enable

    ALP is enabled.

    By default, ALP is enabled for SSH, Telnet, SSHv6, Telnetv6, BGP, FTP, and HTTP.

  4. Run application-apperceive packet-type { ssh | telnet | sshv6 | telnetv6 | bgp | ftp | http } rate-limit rate-value

    The rate limit for SSH packets, Telnet packets, SSHv6 packets, Telnetv6 packets, HTTP packets, BGP packets, or FTP packets is set.

    By default, the rate limit for SSH packets, Telnet packets, SSHv6 packets, Telnetv6 packets, BGP packets, and HTTP packets is 512 pps and the rate limit for FTP packets is 1024 pps.


    If this command is not configured, the default rate limit specified by application-apperceive is applied to SSH, Telnet, SSHv6, Telnetv6, HTTP, BGP, or FTP packets.

    After ALP is configured for FTP packets, it also takes effect for TFTP packets.

  5. Run quit

    Return to the system view.

  6. Run cpu-defend-policy policy-name [ global | slot slot-id ]

    The attack defense policy is applied.

    An attack defense policy takes effect only when it is applied to a board and only one attack defense policy can be applied to a board.

Updated: 2019-08-07

Document ID: EDOC1100034077

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