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Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
link monitor threshold rserr
link monitor threshold rserr
Use the link monitor threshold rserr interface configuration command to establish threshold values for
Reed-Solomon errors. Use the no form of this command to return to the default setting.
link monitor threshold rserr {downstream value | upstream value}
no link monitor threshold rserr {downstream value | upstream value}
This command is available only on Catalyst 2950 Long-Reach Ethernet (LRE) switches.
Syntax Description
Defaults The default is 1000 errors per second.
Command Modes Interface configuration
Command History
Usage Guidelines To compute threshold values, calculate the number of frames that can be sent for a particular bandwidth
based on the LRE profile. Use the show controller lre status profile privileged EXEC command to
determine the downstream and upstream data rates. Divide the downstream data rate by the length of an
LRE frame (216 bytes) multiplied by 8 (8 bits per byte).
For example, a link is running LRE-10, which has a downstream data rate of 12.5 Mbps.
((12500000)/(261*8))=5986
If you configure the downstream Reed-Solomon error threshold to 5986, an alarm counter increments
when the threshold is exceeded.
Examples This example shows how to configure a threshold for Reed-Solomon errors at 4000 errors per second
downstream and 3000 errors per second upstream:
Switch# configure terminal
Switch(config)# interface longreachethernet0/1
Switch(config-if)# link monitor threshold rserr downstream 4000
Switch(config-if)# link monitor threshold rserr upstream 3000
downstream value Number of the Reed-Solomon errors allowed per second at the remote
end of the link. The range is 0 to 25000.
upstream value Number of the Reed-Solomon errors allowed per second at the local end
of the link. The range is 0 to 25000.
Release Modification
12.1(11)YJ This command was introduced.
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