request diagnostics tdr

Syntax

Description

Start a time domain reflectometry (TDR) diagnostic test on the specified interface. This test characterizes and locates faults on twisted-pair Ethernet cables. For example, it can detect a broken twisted pair and provide the approximate distance to the break. It can also detect polarity swaps, pair swaps, and excessive skew.

The TDR test is supported on the following switches and interfaces:

EX2200, EX3200, EX3300, and EX4200 switches—RJ45 network interfaces. The TDR test is not supported on management interfaces and SFP interfaces.
EX6200 and EX8200 switches—RJ45 interfaces on line cards.

Note:

Run the TDR test when the interface traffic under test is nil.
TDR is a cable diagnostic feature that must be triggered only when a link is down.

You view the results of the TDR test with the show diagnostics tdr command.

Options

abort	Stop the TDR test currently in progress on the specified interface. No results are reported, and previous results, if any, are cleared.
`interface-name`	The name of the interface.
start	Start a TDR test on the specified interface.

Required Privilege Level

maintenance

Output Fields

Table 1 lists the output fields for the request diagnostics tdr command. Output fields are listed in the approximate order in which they appear.

Table 1: request diagnostics tdr Output Fields
Field Name	Field Description
Test Status	Information about the status of the TDR test request: Admin Down `interface-name`—The interface is administratively down. The TDR test cannot run on interfaces that are administratively down. Interface `interface-name` not found—The interface does not exist. Test successfully executed `interface-name`—The test has successfully started on the interface. You can view the test results with the `show diagnostics tdr` command. VCT not supported on `interface-name`—The TDR test is not supported on the interface.

Sample Output