Concept Guide

Input IP checksum: 0 0 pps 0
Input overrun: 0 0 pps 0
Output underruns: 0 0 pps 0
Output throttles: 0 0 pps 0
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l - Page up a - Page down
T - Increase refresh interval t - Decrease refresh interval
q - Quit
Dell
Maintenance Using TDR
The time domain reectometer (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 reection of the signal that returns. By examining the reection, 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 apping or not coming up. TDR is not
intended to be used on an interface that is passing trac. 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 trac.
To test the condition of cables on 100/1000/10000 BASE-T modules, 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 10/40GbE switch supports splitting a 40GbE port on the base module or a 2-Port 40GbE QSFP+ module into four 10GbE SFP+ ports
using a 4x10G breakout cable.
NOTE
: By default, the 40GbE ports on a 2-Port 40GbE QSFP+ module come up in 4x10GbE (quad) mode as eight 10GbE ports.
On the base module, you must convert the 40GbE ports to 4x10GbE mode as described in the following section.
NOTE: When you split a 40G port (such as fo 0/4) into four 10G ports, the 40G interface conguration is available in the startup
conguration when you save the running conguration by using the write memory command. When a reload of the system
occurs, the 40G interface conguration 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 conguration le is being loaded. You can
ignore these error messages. Similarly, such error messages are displayed during a reload after you congure the four individual
10G ports to be stacked as a single 40G port.
• Split a single 40G port into 4-10G ports.
CONFIGURATION mode
Interfaces
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