A housing authority wants interface-down events to reach the collector as soon as they happen, not on a fixed poll timer. Which model-driven telemetry design meets that need?
Select an answer to reveal the explanation.
Short Explanation
On-change telemetry is like a smoke alarm—it rings when the link drops, not when someone remembers to check the hallway. A gRPC subscription on the interface oper path streams the event right away. Polling and nightly configs are still looking at the clock instead of the fire.
Full Explanation
Model-driven telemetry on IOS XE can stream subscribed YANG paths over gRPC. On-change subscriptions notify the collector when the watched state transitions, which is ideal for interface downs and similar events. Periodic SNMP or scheduled NETCONF retrieval adds latency and load. SPAN mirroring is a packet-capture technique, not a YANG telemetry subscription.