Cisco 350 Series Administration Manual page 455

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• Track Object State—Each tracking object maintains an operation state. The state is
either: Up or Down. After object creation, the state is set to Up. The following table
specifies the conversion of the IP SLAs operation return code to the object state:
Operation Return Code
OK
Error
If the IP SLAs operation specified by the track argument is not configured or is
NOTE
its schedule is pending, its state is OK.
An application that is bound to a non-existing tracking object will receive the Up
NOTE
state.
• SLA Operation State—This can be either Scheduled, which means the operation
begins immediately or Pending, which means it has been created but not activated.
• Timeout value —Specifies the interval time of waiting for the ICMP echo reply
message or an ICMP error message.
• Return Code—After an operation has been finished the operation return code is set
according to the following:
- ICMP Echo reply has been received—Return code is set to OK.
- ICMP Error reply has been received—Return code is set to error.
- No any ICMP reply has been received—Return code is set to error.
- Configured Source IP address or Source interface is not accessible—Return code is
set to error.
• Tracker—Tracks the results of operations.
• Delay—When the result of an IP SLA operation indicates that the state of the tracking
object should change to X from Y, the tracking object performs the following actions:
- The state of the tracking object is not changed and the tracking object starts the
delay timer for the interval.
- If during the time that the timer is set, the original state (Y) is received again, the
timer is canceled, and the state remains Y.
- If the delay timer is expired, the state of the tracking object is changed to X and the
X state is passed to the associated applications.
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
Track Operation State
Up
Down
IP Configuration: SLA
Overview