Users Guide

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Dell#
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/subport
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/subport
Splitting 40G Ports without Reload
You can split 40G interfaces into 10G ports without reboot. You can also combine the split ports to create a 40G port without reload.
• On a device, fan-out profile constructs automatically with default 24 ports
(2,4,6,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,27,29,31) . These ports can be changed to 40G to 10G mode or vice-versa
without reload.
• When a non-supported profile release is upgraded to a supported profile release, the fan-out configured ports get automatically
included in the profile. In fan-out mode, if a system is upgraded with 25 or 26 ports, only 24 ports get upgraded to fan-out mode. The
rest of the ports are put to default 40G mode.
• In stacking, configure profile first before provisioning for new units. Otherwise it is mandatory to reload for profile to take effect.
• If there is a mismatch in fan-out profile between master and the new member in stacking, the master re-configures the member with
its quad-mode profile, quad-mode, and stack-group configuration and then reset the member. To avoid stack split during profile
mismatch, the master does stack group configurations of the new member.
To configure the quad-port-profile, use the following command:
CONFIGURATION mode
stack-unit stack-unit number slot slot-number port port-number portmode quad
The defaults ports are:
376
Interfaces