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Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
show controllers lre actual
show controllers lre actual
Use the show controllers lre actual privileged EXEC command to display the actual values of the
Long-Reach Ethernet (LRE) link on a specific LRE switch port.
show controllers lre interface-id actual {dsrserrs | link | rxpower | snr | txpower | usrserrs}
[ | {begin | exclude | include} expression]
This command is available only on Catalyst 2950 LRE switches.
Syntax Description
Command Modes Privileged EXEC
Command History
Usage Guidelines You can use the SNR and Reed-Solomon error information to measure the quality of the LRE link. The
SNR is the amount of increased received signal-power (in decibels) relative to the noise-power level that
the switch can tolerate without disconnecting from the CPE device. The higher the ratio, the more
resilient is the link.
The Reed-Solomon errors show the number of errors detected and corrected in the data being received
on and sent from the switch LRE ports. Reed-Solomon errors are the result of noise exceeding the noise
margin. For short bursts of noise (such as motor power on or power surges), the interleave feature
prevents the loss of Ethernet data packets. Then the number of Reed-Solomon errors exceeds the number
of Ethernet CRC errors.
The remote transmit power-rates from the connected CPE devices might be different from each other,
depending on how long the cable is between the switch and the CPE device. A longer cable typically
causes the CPE device to send a higher signal to overcome the loss effects of distance.
interface-id ID of the switch LRE port.
actual Display the LRE port current status, which might not be the same as the
administratively configured settings.
dsrserrs Display the downstream Reed-Solomon errors on the LRE port.
usrserrs Display the upstream Reed-Solomon errors on the LRE port.
txpower Display the remote transmit power (dBm/Hz) on the LRE port.
rxpower Display the local receive power (dBm/Hz) on the customer premises equipment
(CPE) port.
snr Display the signal-to-noise ratio (SNR) ratio on the LRE port.
link Display the LRE link status of the LRE port.
| begin (Optional) Display begins with the line that matches the specified expression.
| exclude (Optional) Display excludes lines that match the specified expression.
| include (Optional) Display includes lines that match the specified expression.
expression Expression in the output to use as a reference point.
Release Modification
12.1(11)YJ This command was introduced.
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