Sample Stream Mode

The gNMI-based Dial-in mode telemetry enables the "STREAM" type subscription with "SAMPLE" mode for the Subscribe RPC.

Sampling Stream Mode Data Flow Description: Subscribe Request and Response

Figure 6 illustrates a sample gnmic Subscribe Request and Subscribe Response between the collector and the OcNOS target device.

Step 1: Subscription Request Initiation

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The gnmic collector server initiates a Subscribe Request by sending a Subscribe RPC in Stream type.

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This subscription request aims explicitly to gather data related to interface state counters and CPU state.

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A fixed 30/45-second sampling interval is set for data collection.

Step 2: Data Collection and Processing

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The gNMI server, within the OcNOS router, is responsible for data collection.

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At regular 30/45-second intervals, it retrieves data from the sensor path, focusing on interface state counters and CPU State.

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The received data undergoes a validation process, and the data is transformed into the required encoding type.

Step 3: Continuous Subscription Response Streaming

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The gNMI Server responds to the subscription request by continuously streaming Subscribe Response data.

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This streaming process maintains the same 30/45-second interval as the data collection.

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The collected data is streamed in real-time to the gnmic collector server.

Figure 6. Sampling Stream Mode Message Flow: Subscribe Request and Response

Sample Stream Mode Benefits

For "counters" type attributes, use a cadence-based sampling mode. This approach enables efficient data push from the target to the collector and smoothly accommodates multiple collectors while minimizing CPU cycles.