After configuring an IP SLA operation, the IP SLA is in pending state and needs to be started using the ip sla schedule global configuration command. To stop the operation and place it in the default state (pending), use the no form of this command.
| Default | By default the operation is put in a pending state. In the pending state the operation is enabled but does not actively probe and collect information. |
| Format | ip sla schedule operation-number |
| Mode | Global Config |
| Parameter | Description |
|---|---|
| operation-number | Identifies the IP SLAs operation being configured. The range is from 1 to 128. |
Usage Guidelines
By default IP SLAs are not scheduled to start. Once an IP SLA object is created using the ip sla global configuration command it needs to be started (with a lifetime of forever) by using the ip sla schedule CLI configuration command. When an ip sla schedule command is issued the ip sla operation transitions from pending state to active and immediately begins probing and collecting information. The IP SLA probes can be stopped by unconfiguring the IP SLA schedule config by using the no ip sla schedule command.
This command is supported in IPv4 networks and also for IPv6 networks where IPv6 addresses are supported.
After you schedule an operation, you cannot modify the configuration of the operation. To modify the configuration of the operation after it is scheduled, you must first stop the operation by using the no ip schedule command and then modify the configuration. Or else you must first delete the IP SLAs operation (using the no ip sla command) and then reconfigure the operation with the new operation parameters.
To display the current configuration settings of the operation, use the show ip sla configuration command in User EXEC or Privileged EXEC mode.
Example: In the following example, operation 55 is configured as a ICMP Echo operation in an IPv4 network and is scheduled to start. The example shows the ip sla schedule command being used in an IPv4 network.
(Routing)(config)# ip sla 55 (Routing)(config-ip-sla)# icmp-echo 172.16.1.175 (Routing) (config-ip-sla-echo)#exit (Routing)(config-ip-sla)#exit (Routing)(config)# ip sla schedule 55
