Cisco Systems 4500 IP SLAs Operation Scheduling, IP SLAs Operation Threshold Monitoring

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Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 60 Configuring Cisco IOS IP SLA Operations
About Cisco IOS IP SLA
IP SLAs Operation Scheduling
For more details about the IP SLAs multioperations scheduling functionality, see the “IP
SLAs—Multiple Operation Scheduling” chapter of the Cisco IOS IP SLAs Configuration Guide at this
URL:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/12_4t/sla_12_4t_book.html
When you configure an IP SLAs operation, you must schedule the operation to begin capturing statistics
and collecting error information. You can schedule an operation to start immediately or to start at a
certain month, day, and hour. You can use the pending option to set the operation to start at a later time.
The pending option is an internal state of the operation that is visible through SNMP. The pending st ate
is also used when an operation is a reaction (threshold) operation waiting to be triggered. You can
schedule a single IP SLAs operation or a group of operations at one time.
You can schedule several IP SLAs operations by using a single command using the Cisco IOS CLI or the
CISCO RTTMON-MIB. Scheduling the operations to run at evenly distributed times allows you to
control the amount of IP SLAs monitoring traffic. This distribution of IP SLAs operations helps
minimize the CPU utilization and thus improves network scalability.
IP SLAs Operation Threshold Monitoring
For details on using thresholds with Cisco IOS IP SLAs operations, see the “IP SLAs—Proactive
Threshold Monitoring” chapter of the Cisco IOS IP SLAs Configuration Guide at this URL:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/12_4t/sla_12_4t_book.html
To support successful service level agreement monitoring, you must have mechanisms that notify you
immediately of any possible violation. IP SLAs can send SNMP traps that are triggered by events such
as these:
• Connection loss
• Timeout
• Round-trip time threshold
• Average jitter threshold
• One-way packet loss
• One-way jitter
• One-way mean opinion score (MOS)
• One-way latency
An IP SLAs threshold violation can also trigger another IP SLAs operation for further analysis. For
example, the frequency could be increased or an ICMP path echo or ICMP path jitter operation could be
initiated for troubleshooting.
Determining the type of threshold and the level to set can be complex, and depends on the type of IP
service being used in the network.