ENA discovers the supported IP SLA operation types on all monitored devices. Polled attributes use the RTTMON MIB, attributes vary according to the operation type.
The User Datagram Protocol (UDP) Echo operation calculates UDP response times between a Cisco device and any IP enabled device. Response time is computed by measuring the time taken to send a datagram and receive a response from the destination device.
When the target is a Cisco router with an active responder, then Cisco IOS IP SLA can send a UDP datagram to any specified port number. When the destination is a non-Cisco IP host, then a port must be specified.
By default, the Echo operation uses UDP port 7, although another port may be specified.
For accurate measurements, UDP Echo requires clock synchronization between source and destination, and an available Cisco IOS IP SLA responder on the destination device.
UDP Echo operation attributes:
|Operation Index||unique identifier of the operation.|
|Name||IP SLA operation name.|
|Type||type of operation to be performed.|
|Frequency||sets the duration between initiating each operation. You should not set this to a value that is of a shorter duration than Timeout. The minimum allowed value is 10 seconds.|
|Tag||descriptive string used by ENA to identify the operation target.|
|Owner||identifies the creator the operation.|
|Protocol||protocol used by the operation.|
|Source Address||specifies the IP address of the source.|
|Target Address||specifies the IP address of the destination.|
port on the source device used by the operation.
|Target Port||target's port number.|
|TOS||defines the IP Type of Service (TOS) byte for request packets. This attribute may also be used as a Differentiated Services Code Point (DSCP).|
|Control Packets||when enabled (true), the operation sends control messages to a responder. The responder resides on the target device to respond to the data request packets being sent by the source device.|
|Lifespan||IP SLA operation interval, by default set to forever. i.e. once created it exists forever on the device, unless deleted by ENA. You can enter a limited lifespan, by entering a value in seconds. When this time elapses, the operation and ENA has to recreate it.|
|VRF Name||name of the MPLS IP VPN VRF.|
|Timeout||length of time, in seconds, that ENA waits for a response from the IP SLA operation before marking it as timed-out. You should not set a value which is of a greater duration than Frequency.|
|Interval||IP SLA operation interval.|
UDP Echo operation time series attributes:
|Object Name||Attribute and Description|
|rttMonLatestRttOperCompletionTime||Completion Time. The latest completion time of
RTT operations which complete successfully
|rttMonLatestRttOperSense||Sense. The latest completion time of any RTT
operation which completes successfully