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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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Checking Connectivity of CSS Links

Checking Connectivity of CSS Links

Context

If a cluster link is Up, but packet loss or error packets are found on the cluster link or the CSS status is unstable, you can check connectivity of the cluster link to analyze the cause. By performing a loopback test on a cluster link, you can determine whether the cluster link is working normally.

The process of a loopback test on a CSS link is as follows:
  1. Check the port status. If the tested port status is Down, perform a local loopback test and export the test result.
  2. If the tested port status is Up, perform a connectivity test on service packets. If all service packets pass the test, export the test result and there is no need to perform a loopback test. If some service packets fail the test, perform loopback tests including local loopback test and remote loopback test.
    • If both local and remote loopback tests succeed, export the test result.
    • If the local loopback test fails, do not perform a remote loopback test, export the test result directly, and give suggestions on recommended operations.
    • If the local loopback test succeeds but the remote loopback test fails, export the test result and give suggestions on recommended operations.
NOTE:
  • This command is not supported in a CSS set up using integrated CSS cards and 4*10G CSS ports.

  • When this command is executed on a CSS port to perform a loopback test on the CSS link, traffic on this link is switched to other CSS links. Therefore, a loopback test can be performed only when at least two links are available between the CSS cards. If bandwidth on the CSS links is low, performing a loopback test may affect running services.

Procedure

  1. Run the system-view command to enter the system view.
  2. Run the css link port port test [ times times | package-size package-size | interval interval | verbose ] * command to perform a loopback test on a cluster link and determine connectivity of the cluster link according to the test result.
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Updated: 2019-08-21

Document ID: EDOC1000142080

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