Failure to do so can lead to misleading results.
For fixed 10/100 ports, before running the TDR test, disable auto-MDIX on both sides of the cable.If the port speed is 1000 and the link is up, do not disable the auto-MDIX feature.% Use 'no shutdown' to enable interface before TDR test start. % Interface Gi2/12 is administratively down If the port is down, the test cable-diagnostics tdr command is rejected and the following message is displayed: Router# test cable-diagnostics tdr interface gigabitethernet2/12 The interface must be up before running the TDR test.This action may result in incorrect test results. Do not change the port configuration during any cable diagnostics test.Starting the test at both ends of the cable at the same time can lead to false test results. Do not start the test at the same time on both ends of the cable.The valid values for interface type are fastethernet and gigabitethernet.See the Release Notes for Cisco IOS Release 12.2SX on the Catalyst 6500 and Cisco 7600 Supervisor Engine 720, Supervisor Engine 32, and Supervisor Engine 2 for the list of the modules that support TDR. The TDR test is supported on Cisco 7600 series routers running Release 12.2(17a)SX and later releases on specific mdoules.TDR can test cables up to a maximum length of 115 meters.This command was integrated into Cisco IOS Release 12.2(33)SRA.Ĭable diagnostics can help you detect whether your cable has connectivity problems. Support for this command on the Supervisor Engine 2 was extended to Release 12.2(17d)SXB. This command was changed to provide support for the 4-port 10GBASE-E serial 10-Gigabit Ethernet module (WS-X6704-10GE). Support for this command was introduced on the Cisco 7600 series routers. Specifies the interface type see the "Usage Guidelines" section for valid values. Test cable-diagnostics tdr interface type number Syntax DescriptionĪctivates the TDR test for copper cables on 48-port 10/100/1000 BASE-T modules. To test the condition of 10-Gigabit Ethernet links or copper cables on 48-port 10/100/1000 BASE-T modules, use the test cable-diagnostics command in privileged EXEC mode.
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