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Calculate access ports, PoE classes and spare uplink capacity from endpoint inventory and growth rather than ordering by current occupied ports alone. This action instead applies to Port density and growth headroom. Port availability, available watts and uplink throughput are separate constraints in campus switch sizing. It does not directly resolve the controlling requirement. The targeted response is: Reconcile the approved design with actual interfaces, optics, firmware, cable labels and final switch configurations after deployment. Scenario: A new switch is installed with a different software version than the approved baseline but no deviation is recorded.

Correct the precise RADIUS, EAP or role-download fault while retaining least-privilege policy and test-deny behavior. This action instead applies to Authentication and RADIUS remediation discipline. Replacing an authentication outage with unrestricted open ports is not equivalent to a secure remediation. It does not directly resolve the controlling requirement. The targeted response is: Reconcile the approved design with actual interfaces, optics, firmware, cable labels and final switch configurations after deployment. Scenario: A new switch is installed with a different software version than the approved baseline but no deviation is recorded.

Schedule VLAN creation, trunk allowance, SVI services and routing prerequisites before switching live endpoint traffic. This action instead applies to Dependency ordering for VLAN and routed cutovers. Changes to L2 carriage and L3 gateway reachability must be ordered to avoid transient black holes. It does not directly resolve the controlling requirement. The targeted response is: Reconcile the approved design with actual interfaces, optics, firmware, cable labels and final switch configurations after deployment. Scenario: A new switch is installed with a different software version than the approved baseline but no deviation is recorded.

Apply policing for untrusted ingress excess and shaping where controlled egress pacing is needed, selecting supported switch features. This action instead applies to Ingress policing versus egress shaping design. Policing may drop traffic exceeding a rate; shaping queues traffic to reduce bursts where the platform supports it. It does not directly resolve the controlling requirement. The targeted response is: Configure queue weights or strict priority carefully so latency-sensitive applications receive service without starving other traffic. Scenario: A saturated WAN uplink drops voice packets despite active QoS policy because classification is incorrect.

Classify traffic at supported trust boundaries and map DSCP/802.1p markings into queues consistent with the approved policy. This action instead applies to QoS DSCP trust boundary and class mapping. A QoS marking has no guaranteed effect unless the device trusts, classifies and schedules it as intended. It does not directly resolve the controlling requirement. The targeted response is: Configure queue weights or strict priority carefully so latency-sensitive applications receive service without starving other traffic. Scenario: A saturated WAN uplink drops voice packets despite active QoS policy because classification is incorrect.

Interpret sustained and peak port utilization alongside errors, queue drops and application quality before deciding on upgrades. This action instead applies to Interface utilization and capacity trend interpretation. Long-term averages alone may hide microbursts or fail to prove that a slow application requires a faster physical port. It does not directly resolve the controlling requirement. The targeted response is: Configure queue weights or strict priority carefully so latency-sensitive applications receive service without starving other traffic. Scenario: A saturated WAN uplink drops voice packets despite active QoS policy because classification is incorrect.

An incident is routed to the accountable owner with reproducible fault evidence instead of disconnected alarms. This result is associated with Troubleshooting evidence dashboard and incident triage; it does not demonstrate the requested network behavior. The relevant acceptance test is: The affected flow is traced through the correct routing table with no accidental cross-VRF access. Scenario: A branch app breaks when a new routed interface is accidentally assigned to the default instead of customer VRF.

A redundant path remains correctly controlled while a mistaken loop or root shift is isolated. This result is associated with STP blocking and topology-loop recognition; it does not demonstrate the requested network behavior. The relevant acceptance test is: The affected flow is traced through the correct routing table with no accidental cross-VRF access. Scenario: A branch app breaks when a new routed interface is accidentally assigned to the default instead of customer VRF.

The intended aggregate forms and remains stable under a member unplug test. This result is associated with LACP peer repair without unsafe bypass; it does not demonstrate the requested network behavior. The relevant acceptance test is: The affected flow is traced through the correct routing table with no accidental cross-VRF access. Scenario: A branch app breaks when a new routed interface is accidentally assigned to the default instead of customer VRF.

Check per-VRF interfaces and routes, policy-based leaks, next hop resolution and source/destination acceptance tests. These checks can help with VRF isolation and controlled route leaking, but they are not the most discriminating first evidence here. Examine: Check actual watt draw, negotiated 802.3af/at/bt class, switch budget, PSU status and power priorities. Scenario: High-power wireless access points restart whenever a full closet of phones powers on.

Inspect interface admin/oper state, optic transmit/receive power, CRC/FCS counters, negotiated speed and neighbor light levels. These checks can help with Physical link failure diagnostics, but they are not the most discriminating first evidence here. Examine: Check actual watt draw, negotiated 802.3af/at/bt class, switch budget, PSU status and power priorities. Scenario: High-power wireless access points restart whenever a full closet of phones powers on.

Compare live LLDP neighbors, optical transceiver inventory, cable identifiers, rack diagrams and authorized topology. These checks can help with Front-panel and cabling as-built verification, but they are not the most discriminating first evidence here. Examine: Check actual watt draw, negotiated 802.3af/at/bt class, switch budget, PSU status and power priorities. Scenario: High-power wireless access points restart whenever a full closet of phones powers on.

Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. These checks can help with PIM and multicast routed-path validation, but they are not the most discriminating first evidence here. Examine: Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. Scenario: Receivers join an audio multicast group but the switch ages memberships with no active querier.

Inspect target resource, writable fields, current object representation, HTTP status, expected diff and checkpoint restore path. These checks can help with Idempotent REST updates and config difference verification, but they are not the most discriminating first evidence here. Examine: Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. Scenario: Receivers join an audio multicast group but the switch ages memberships with no active querier.

Check actual watt draw, negotiated 802.3af/at/bt class, switch budget, PSU status and power priorities. These checks can help with Power and PoE field commissioning, but they are not the most discriminating first evidence here. Examine: Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. Scenario: Receivers join an audio multicast group but the switch ages memberships with no active querier.

Inspect process CPU over time, event logs, topology change rate, protocol adjacency resets and agent schedules. These checks can help with High CPU and control-plane protocol churn, but they are not the most discriminating first evidence here. Examine: Inspect queue backlog, buffer thresholds, drop reasons, burst traffic composition and port egress rates. Scenario: A traffic-engineering change reserves nearly all output queue resources for one low-volume priority service.

Check actual watt draw, negotiated 802.3af/at/bt class, switch budget, PSU status and power priorities. These checks can help with Power and PoE field commissioning, but they are not the most discriminating first evidence here. Examine: Inspect queue backlog, buffer thresholds, drop reasons, burst traffic composition and port egress rates. Scenario: A traffic-engineering change reserves nearly all output queue resources for one low-volume priority service.

Inspect physical alarms, optical budget, loopback results, error history, supported optics and redundant-path readiness. These checks can help with Optic and port fault replacement strategy, but they are not the most discriminating first evidence here. Examine: Inspect queue backlog, buffer thresholds, drop reasons, burst traffic composition and port egress rates. Scenario: A traffic-engineering change reserves nearly all output queue resources for one low-volume priority service.

Correlate performance alarms with actual interface, application and configuration history before treating a reporting threshold as a hardware failure. This step pertains to Telemetry false-positive and baseline drift analysis but is not one of the two complementary decisions in this case. The required response and evidence are: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Together with: Inspect multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: Digital signage traffic unexpectedly floods every port after the IGMP querier disappears.

Inspect peak counters, buffers, burst duration, port rates, packet loss and affected application flows. This step pertains to Microburst and oversubscription performance analysis but is not one of the two complementary decisions in this case. The required response and evidence are: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Together with: Inspect multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: Digital signage traffic unexpectedly floods every port after the IGMP querier disappears.

A legacy device gains only the intended restricted access while unauthorized MACs do not inherit broad corporate privileges. This step pertains to MAC authentication and critical access fallback but is not one of the two complementary decisions in this case. The required response and evidence are: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Together with: Inspect multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: Digital signage traffic unexpectedly floods every port after the IGMP querier disappears.

The installed equipment maintains acceptable temperature and power redundancy, with recoverable console access. This step pertains to Physical installation and rack power implementation but is not one of the two complementary decisions in this case. The required response and evidence are: Correlate system logs, NTP timestamps and interface or protocol counters to reconstruct network incidents accurately. Together with: Inspect time source, log severity, event chronology, switch identity, syslog delivery and related config changes. Scenario: Three switches report a routing flap at different wall-clock times because one NTP source is incorrect.

Inspect routing process events, neighbor restart counters, route-table changes, forwarding next hops and convergence timestamps. This step pertains to Routing adjacency and convergence telemetry interpretation but is not one of the two complementary decisions in this case. The required response and evidence are: Correlate system logs, NTP timestamps and interface or protocol counters to reconstruct network incidents accurately. Together with: Inspect time source, log severity, event chronology, switch identity, syslog delivery and related config changes. Scenario: Three switches report a routing flap at different wall-clock times because one NTP source is incorrect.

Use authorized telemetry access, polling cadence and data retention to collect switch statistics without overwhelming platforms. This step pertains to SNMP and streaming telemetry collection governance but is not one of the two complementary decisions in this case. The required response and evidence are: Correlate system logs, NTP timestamps and interface or protocol counters to reconstruct network incidents accurately. Together with: Inspect time source, log severity, event chronology, switch identity, syslog delivery and related config changes. Scenario: Three switches report a routing flap at different wall-clock times because one NTP source is incorrect.

Review site power circuits, PSU ratings, environmental constraints, rack elevations and OOB console reachability. These checks can help with Physical installation and rack power implementation, but they are not the most discriminating first evidence here. Examine: Compare firmware, config diffs, CPU/memory, temperature, traffic rates and log markers for the relevant period. Scenario: Performance deteriorates after a QoS template revision but the team compares only current interface state.

Inspect local/remote port IDs, system descriptions, LLDP freshness, link MACs and expected cable map. These checks can help with LLDP topology and neighbor mapping, but they are not the most discriminating first evidence here. Examine: Compare firmware, config diffs, CPU/memory, temperature, traffic rates and log markers for the relevant period. Scenario: Performance deteriorates after a QoS template revision but the team compares only current interface state.

Inspect alert provenance, affected services, neighbor failures, threshold history and last known change. These checks can help with Troubleshooting evidence dashboard and incident triage, but they are not the most discriminating first evidence here. Examine: Compare firmware, config diffs, CPU/memory, temperature, traffic rates and log markers for the relevant period. Scenario: Performance deteriorates after a QoS template revision but the team compares only current interface state.

Inspect LACP neighbor identity, actor/partner keys, aggregated member state, group configuration and per-member counters. These checks can help with LACP aggregation mismatch investigation, but they are not the most discriminating first evidence here. Examine: Inspect ingress VRF, SVI assignment, per-VRF routes, next-hop resolution, leak policy and permitted firewall path. Scenario: Operations claims a route is missing although it is installed under a different VRF than the failing packet.

Check root bridge ID, port role/state, BPDU activity, topology change count and MAC instability. These checks can help with STP blocking and topology-loop recognition, but they are not the most discriminating first evidence here. Examine: Inspect ingress VRF, SVI assignment, per-VRF routes, next-hop resolution, leak policy and permitted firewall path. Scenario: Operations claims a route is missing although it is installed under a different VRF than the failing packet.

Inspect ISL status, VSX keepalive, MC-LAG members, VLAN consistency, active gateway and split-brain protections. These checks can help with VSX and aggregation integration verification, but they are not the most discriminating first evidence here. Examine: Inspect ingress VRF, SVI assignment, per-VRF routes, next-hop resolution, leak policy and permitted firewall path. Scenario: Operations claims a route is missing although it is installed under a different VRF than the failing packet.

Use supported AOS-CX API endpoints and role-scoped service accounts for automations, separating read-only audits from approved changes. This action instead applies to REST API and configuration-tool integration boundaries. API availability, versioning and authorization govern integrations; an HTTP success status must be correlated with network state. It does not directly resolve the controlling requirement. The targeted response is: Restore an OSPF adjacency or missing advertisement using targeted parameter, area or redistribution corrections with route verification. Scenario: An OSPF neighbor fails on one campus boundary because area numbers differ after a cutover.

Correct the precise RADIUS, EAP or role-download fault while retaining least-privilege policy and test-deny behavior. This action instead applies to Authentication and RADIUS remediation discipline. Replacing an authentication outage with unrestricted open ports is not equivalent to a secure remediation. It does not directly resolve the controlling requirement. The targeted response is: Restore an OSPF adjacency or missing advertisement using targeted parameter, area or redistribution corrections with route verification. Scenario: An OSPF neighbor fails on one campus boundary because area numbers differ after a cutover.

Replace only a proven faulty transceiver, cable or interface path with supported parts and validate clean counters afterward. This action instead applies to Optic and port fault replacement strategy. Transceiver swap is justified by Layer 1 evidence and a compatible replacement, not by arbitrary routing failures. It does not directly resolve the controlling requirement. The targeted response is: Restore an OSPF adjacency or missing advertisement using targeted parameter, area or redistribution corrections with route verification. Scenario: An OSPF neighbor fails on one campus boundary because area numbers differ after a cutover.