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Maintenance Using TDR
The time domain reflectometer (TDR) is supported on all Dell Networking switch/routers.
TDR is an assistance tool to resolve link issues that helps detect obvious open or short conditions within any of the four copper
pairs. TDR sends a signal onto the physical cable and examines the reflection of the signal that returns. By examining the
reflection, TDR is able to indicate whether there is a cable fault (when the cable is broken, becomes unterminated, or if a
transceiver is unplugged).
TDR is useful for troubleshooting an interface that is not establishing a link; that is, when the link is flapping or not coming up.
TDR is not intended to be used on an interface that is passing traffic. When a TDR test is run on a physical cable, it is important
to shut down the port on the far end of the cable. Otherwise, it may lead to incorrect test results.
NOTE
: TDR is an intrusive test. Do not run TDR on a link that is up and passing traffic.
To test and display TDR results, use the following commands.
1 To test for cable faults on the TenGigabitEthernet cable.
EXEC Privilege mode
tdr-cable-test tengigabitethernet slot/port
Between two ports, do not start the test on both ends of the cable.
Enable the interface before starting the test.
Enable the port to run the test or the test prints an error message.
2 Displays TDR test results.
EXEC Privilege mode
show tdr tengigabitethernet slot/port
Splitting QSFP Ports to SFP+ Ports
The platform supports splitting a single 40G QSFP port into four 10G SFP+ ports using one of the supported breakout cables
(for a list of supported cables, refer to the Installation Guide or the Release Notes).
NOTE
: When you split a 40G port (such as fo 1/4) into four 10G ports, the 40G interface configuration is still available in the
startup configuration when you save the running configuration by using the write memory command. When a reload of
the system occurs, the 40G interface configuration is not applicable because the 40G ports are split into four 10G ports
after the reload operation. While the reload is in progress, you might see error messages when the configuration file is
being loaded. You can ignore these error messages. Similarly, such error messages are displayed during a reload after you
configure the four individual 10G ports to be stacked as a single 40G port.
To split a single 40G port into four 10G ports, use the following command.
• Split a single 40G port into four 10G ports.
CONFIGURATION mode
stack-unit stack-unit-number port number portmode quad
– number: enter the port number of the 40G port to be split.
NOTE: To revert the port mode to 40G, use the no stack-unit stack-unit-number port port-number portmode
quad command.
Interfaces 393