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That diagnosis is supported by a different symptom: A collector displays byte totals but no per-application flow records from the router. Here the recorded observation is: raw datagrams arrive at the collector but display as undecodable unknown fields. The applicable cause is: the collector lacks valid compatible templates or has mismatched export protocol expectations.

That diagnosis is supported by a different symptom: Traffic capture fails across a routed hop even though the source port sees packets. Here the recorded observation is: raw datagrams arrive at the collector but display as undecodable unknown fields. The applicable cause is: the collector lacks valid compatible templates or has mismatched export protocol expectations.

That diagnosis is supported by a different symptom: Telemetry remains empty during an outbound-only test despite healthy exporter sessions. Here the recorded observation is: raw datagrams arrive at the collector but display as undecodable unknown fields. The applicable cause is: the collector lacks valid compatible templates or has mismatched export protocol expectations.

That control reduces a separate risk: Flexible NetFlow records or monitor attachment are not collecting the required per-flow keys. For the described design, the recurring risk arises from: the collector lacks valid compatible templates or has mismatched export protocol expectations. The specific required safeguard is: monitor template refresh and collector decoding after record changes.

That control reduces a separate risk: The implementation uses a Layer 2 RSPAN assumption across a network lacking VLAN continuity. For the described design, the recurring risk arises from: the collector lacks valid compatible templates or has mismatched export protocol expectations. The specific required safeguard is: monitor template refresh and collector decoding after record changes.

That control reduces a separate risk: The monitor is attached in the wrong traffic direction/interface for the tested flows. For the described design, the recurring risk arises from: the collector lacks valid compatible templates or has mismatched export protocol expectations. The specific required safeguard is: monitor template refresh and collector decoding after record changes.

Matching the capture destination bandwidth to the offered mirrored load or reduce capture scope would not address the need for account for sampling in interpretation and use unsampled collection where exact counts are required and supported.

Attaching the correct flow monitor to the intended ingress or egress direction supported by the platform would not address the need for account for sampling in interpretation and use unsampled collection where exact counts are required and supported.

Configuring a supported Flexible NetFlow record, exporter and monitoring on the appropriate interface and direction would not address the need for account for sampling in interpretation and use unsampled collection where exact counts are required and supported.

This test measures a different behavior: Observe flow cache counters for traffic in the actual direction and match collector records. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare sampled estimate versus actual traffic generator packet count on known flows.

This test measures a different behavior: Compare source byte rate with destination dropped/missed capture counters under load. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare sampled estimate versus actual traffic generator packet count on known flows.

This test measures a different behavior: Inspect NetFlow monitor cache and confirm collector receives expected five-tuple flow fields. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare sampled estimate versus actual traffic generator packet count on known flows.

That diagnosis is supported by a different symptom: Telemetry remains empty during an outbound-only test despite healthy exporter sessions. Here the recorded observation is: short low-volume sessions disappear from sampled flow statistics. The applicable cause is: packet sampling is probabilistic and does not guarantee observation of each short-lived flow.

That diagnosis is supported by a different symptom: A trace omits bursts that are visible in source interface statistics. Here the recorded observation is: short low-volume sessions disappear from sampled flow statistics. The applicable cause is: packet sampling is probabilistic and does not guarantee observation of each short-lived flow.

That diagnosis is supported by a different symptom: A collector displays byte totals but no per-application flow records from the router. Here the recorded observation is: short low-volume sessions disappear from sampled flow statistics. The applicable cause is: packet sampling is probabilistic and does not guarantee observation of each short-lived flow.

That control reduces a separate risk: The monitor is attached in the wrong traffic direction/interface for the tested flows. For the described design, the recurring risk arises from: packet sampling is probabilistic and does not guarantee observation of each short-lived flow. The specific required safeguard is: label sampled flow reports and avoid using sampled counts as exact billing records.

IPFIX template compatibility makes exports decodable, but it cannot turn a one-in-100 sample into an exact per-session packet count.

Configuring a record, exporter and monitor does not remove the statistical uncertainty introduced by packet sampling.

Using supported RSPAN source/destination sessions with a dedicated RSPAN VLAN traversing the intermediate links would not configure a local SPAN source and an analyzer destination port on the same supported switch.

Using supported ERSPAN encapsulation from source to routed collector destination with reachable outer IP paths would not configure a local SPAN source and an analyzer destination port on the same supported switch.

Matching the capture destination bandwidth to the offered mirrored load or reduce capture scope would not configure a local SPAN source and an analyzer destination port on the same supported switch.

This test measures a different behavior: Verify RSPAN VLAN reachability and mirrored frames at the remote destination port. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect SPAN session source/destination and confirm captured test frames on the analyzer.

This test measures a different behavior: Inspect ERSPAN GRE packets at the collector and verify the correct session ID and payload. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect SPAN session source/destination and confirm captured test frames on the analyzer.

This test measures a different behavior: Compare source byte rate with destination dropped/missed capture counters under load. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect SPAN session source/destination and confirm captured test frames on the analyzer.

That diagnosis is supported by a different symptom: The remote analyzer captures nothing despite local source SPAN being active. Here the recorded observation is: the analyzer receives no frames even though the source interface is forwarding normally. The applicable cause is: no correctly attached local SPAN destination/source session exists.

That diagnosis is supported by a different symptom: A trace omits bursts that are visible in source interface statistics. Here the recorded observation is: the analyzer receives no frames even though the source interface is forwarding normally. The applicable cause is: no correctly attached local SPAN destination/source session exists.

That diagnosis is supported by a different symptom: Traffic capture fails across a routed hop even though the source port sees packets. Here the recorded observation is: the analyzer receives no frames even though the source interface is forwarding normally. The applicable cause is: no correctly attached local SPAN destination/source session exists.

That control reduces a separate risk: The implementation uses a Layer 2 RSPAN assumption across a network lacking VLAN continuity. For the described design, the recurring risk arises from: no correctly attached local SPAN destination/source session exists. The specific required safeguard is: limit SPAN sessions to needed ports and avoid production throughput overload on destination links.

That control reduces a separate risk: The monitor destination is oversubscribed and silently drops mirrored packets. For the described design, the recurring risk arises from: no correctly attached local SPAN destination/source session exists. The specific required safeguard is: limit SPAN sessions to needed ports and avoid production throughput overload on destination links.

That control reduces a separate risk: The RSPAN VLAN is not defined or carried across the inter-switch path. For the described design, the recurring risk arises from: no correctly attached local SPAN destination/source session exists. The specific required safeguard is: limit SPAN sessions to needed ports and avoid production throughput overload on destination links.

Using supported ERSPAN encapsulation from source to routed collector destination with reachable outer IP paths would not meet the need for supported RSPAN source/destination sessions with a dedicated RSPAN VLAN traversing the intermediate links.

Configuring a local SPAN source and an analyzer destination port on the same supported switch would not meet the need for supported RSPAN source/destination sessions with a dedicated RSPAN VLAN traversing the intermediate links.

Configuring a supported Flexible NetFlow record, exporter and monitoring on the appropriate interface and direction would not meet the need for supported RSPAN source/destination sessions with a dedicated RSPAN VLAN traversing the intermediate links.