Users 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
m - Change mode c - Clear screen
l - Page up a - Page down
T - Increase refresh interval t - Decrease refresh interval
q - Quit
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. Do not use TDR 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 the condition of cables on 100/1000/10000 BASE-T modules, follow the below steps using the
tdr-cable-test command.
Step Command Syntax Command Mode Usage
1.
tdr-cable-test tengigabitethernet
<slot>/<port>
EXEC Privilege To test for cable faults on the
TenGigabitEthernet cable.
• Between two ports, you must not
start the test on both ends of the
cable.
• Enable the interface before starting
the test.
• The port must be enabled to run the
test or the test prints an error
message.
2.
show tdr tengigabitethernet
<slot>/<port>
EXEC Privilege Displays TDR test results.
Flow Control Using Ethernet Pause Frames
An Aggregator auto-configures to operate in auto-DCB-enable mode (Refer to Data Center Bridging:
Auto-DCB-Enable Mode). In this mode, Aggregator ports detect whether peer devices support converged
enhanced Ethernet (CEE) or not, and enable DCBX and PFC or link-level flow control accordingly:
• Interfaces come up with DCB disabled and link-level flow control enabled to control data
transmission between the Aggregator and other network devices.
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Interfaces