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.
Domain Name System (DNS) response time is measured as the difference between the time taken to send a DNS request and receiving the reply:
- when Address to Resolve specifies an IP address, the operation resolves the hostname.
- when Address to Resolve specifies a hostname, the operation resolves the IP address.
The DNS operation is useful for checking DNS performance, which is an important element for judging network performance.
DNS 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.|
|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.|
|Target Address String||address to resolve.|
|Name Server||IP address of name server.|
DNS operation time series attributes:
|Object Name||Attribute and Description|
|rttMonLatestRttOperCompletionTime||Completion Time. The latest completion time of RTT operations that successfully complete.|
|rttMonLatestRttOperSense||Sense. Latest completion time of any RTT operation that successfully completes.|