Avaya P580 - Manual (Page 220)

5-40 Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1
Chapter 5
the rate of errors that occurs to the threshold values that you set.
This feature helps you find the source of the errors and take
corrective action if necessary.
This feature monitors the Ethernet CRC errors on Ethernet data
ports. At a pre-determined interval, the feature compares the
number of errors to the threshold settings. By enabling this feature,
you can log errors in the event log and shutdown the port that is
receiving CRC error packets. Currently you can enable this feature
only by using the CLI and only for ports on 50-series and 80-series
gigabit modules. For more information about this feature, see
“
Network Error Detection and Recovery ” in Chapter 5.
If NEDR shuts down a port, the switch will forward traffic through a
redundant port if you:
■
Enable a protocol that supports redundancy, such as OSPF,
VRRP, or STP, on the port
■
Provide an alternate path
If you do not enable a protocol that supports redundancy on the
port and provide an alternate path, you may lose traffic if the port
shuts down.
* Note: You can enable NEDR only for ports on gigabit Ethernet
modules and only by using CLI commands. You cannot
enable the feature on any other types of ports, for
example, Ethernet 10/100, ATM Uplink, or supervisor,
and cannot enable the feature by using the Web Agent.
* Note: If the switch has an 80-series supervisor module
installed, monitoring begins as soon as you turn on the
switch. If the switch has a layer 3 supervisor module
installed, monitoring may not begin until approximately
35 seconds after you turn on the switch.
If the rate of CRC errors equals or exceeds the threshold value, the
NEDR feature can:
■
Disable the port