Here is a quote from the DOC-CD for you that does an excellent job of explaining this:
"IP SLAs includes the capability for triggering SNMP notifications based on defined thresholds. This allows for proactive monitoring in an environment where IT departments can be alerted to potential network problems, rather than having to manually examine data. IP SLAs supports threshold monitoring for performance parameters such as average jitter, unidirectional latency and bidirectional round trip time and connectivity. This proactive monitoring capability provides options for configuring reaction thresholds for important VoIP related parameters including unidirectional jitter, unidirectional packet loss, and unidirectional VoIP voice quality scoring (MOS scores). IP SLAs can generate system logging (syslog) messages when the reaction threshold increases or decreases beyond the configured values for packet loss, average jitter, or MOS. These system logging messages can then be sent as SNMP notifications (traps) using the CISCO-SYSLOG-MIB. For packet loss and jitter, notifications can be generated for violations in either direction (source to destination and destination to source) or for round trip values. Packet loss, jitter and MOS statistics are specific to IP SLAs Jitter operations. Notifications can also be triggered for other events, such as round-trip-time violations, for most IP SLAs monitoring operations." http://www.cisco.com/en/US/docs/ios/12_4/ip_sla/configuration/guide/hsthresh.html On Jan 3, 2012, at 4:21 AM, waleed ' wrote: in sla monitor , what the meaning of threshold parameter ? <ATT00001.c>
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