Setting Error Thresholds; Switch Agent Extension Caching - Compaq ServerNet ServerNet II Installation Manual

J-12 Compaq ServerNet II PCI Adapter and Switch Installation Guide

Setting Error Thresholds

The switch can generate events whenever error thresholds are reached. The switch
counts the following types of errors:
Link errors: This includes illegal or out of frame symbols, FIFO overflow or
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underflow, and missing status fields. This counter is maintained in
snetSwitchLinkErrorCounter. The corresponding threshold value is maintained in
snetSwitchLinkErrorThreshold.
Packet errors: This includes Bad packet CRC, bad packet length, and bad packet
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destination. This counter is maintained in snetSwitchPacketErrorCounter. The
corresponding threshold value is maintained in snetSwitchPacketErrorThreshold.
IBC errors: This includes invalid message control length, invalid transaction
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length, invalid IBC packet CRC. This counter is maintained in
snetSwitchIBCErrorCounter. The corresponding threshold value is maintained in
snetSwitchIBCErrorThreshold.
The default value for all the error thresholds is 1. This means the event will be generated
the first time the error is encountered. It will not be generated again until the error
counter rolls over and reaches 1 again. The user can reset error thresholds in order to
receive an event whenever a certain number of errors are encountered. Change the
snetSwitchLinkErrorThreshold, snetSwitchPacketErrorThreshold, or
snetSwitchIBCErrorThreshold by issuing an SNMP SET request to the desired threshold
value. The error counters run continuously and cannot be reset. The current values of the
error counters can be retrieved by issuing an SNMP GET on
snetSwitchLinkErrorCounter, snetSwitchPacketErrorCounter and
snetSwitchIBCErrorCounter. These counters are per port.
Users can turn off SNMP trap generation for threshold errors by setting
snetSwitchThresholdErrorTrapEnable to 0.

Switch Agent Extension Caching

The ServerNet II Switch Agent Extension restricts the frequency of its calls for Switch
data to prevent degradation of ServerNet II performance.
The ServerNet II Switch object-variable snetSwitchRefreshTime specifies the value for
this data refresh interval. The default value for snetSwitchRefreshTime is one ServerNet
II Switch Agent Extension call every 60 seconds during normal operation. You can
change this read-write value by writing a new value to snetSwitchRefreshTime from an
SNMP manager station.
The ServerNet II Switch Agent Extension does not poll the Switch for data. It retrieves
data in logical groups only when it is requested by an SNMP management application.
For example, if a management application requests the link error threshold value, only
the threshold values are retrieved. No other data is retrieved unless it is requested. The
refresh time specifies the minimum wait time before refreshing any one specific group
of data.