Related Documentation
request diagnostics tdr
Syntax
Release Information
Command introduced in Junos OS Release 9.0 for EX Series switches.
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—RJ-45 network interfaces. The TDR test is not supported on management interfaces and SFP interfaces.
- EX6200 and EX8200 switches—RJ-45 interfaces on line cards.
 | Note: We recommend running the TDR test when there is no traffic on the interface under test. |
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
Related Documentation
List of Sample Output
request diagnostics tdr start interface ge-0/0/19Output 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:
|
Sample Output
request diagnostics tdr start interface ge-0/0/19
user@switch> request diagnostics tdr start interface ge-0/0/19 Interface TDR detail: Test status : Test successfully executed ge-0/0/19
