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S12700 V200R010C00 Configuration Guide - Device Management

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.
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Configuring the CSS Physical Port-Down Delay Function

Configuring the CSS Physical Port-Down Delay Function

Context

In long-distance clustering, there may be a transmission device between two devices in a CSS. When an active/standby switchover is performed on the transmission device, CSS ports on both ends will become Down, causing the CSS to split. After the CSS port-Down delay function is configured, the event that CSS ports become Down for a short period within 500 ms will not be reported to the control plane, preventing the CSS from splitting.

  • This function is mainly used in long-distance clustering. If the CSS is set up using copper cables or active optical cables (AOCs), do not use this function.
  • During the delay after which physical member ports become Down, if the configured response time of 802.1ag, BFD, and MPLS_OAM is short, these protocols will flap. For example, if the configured response time of BFD is within 100 ms, temporary packet loss may cause BFD to flap.

  • During the delay after which physical member ports become Down, some packets forwarded between chassis will be lost.

Procedure

  1. Run the system-view command to enter the system view.
  2. Run the css link-down-delay command to configure the CSS physical port-Down delay function.

    By default, the CSS physical port-Down delay function is not configured.

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Updated: 2019-08-21

Document ID: EDOC1000142080

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