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Inspect serial and MAC claim, subscription, tenant organization, management network DNS/TLS/NTP and switch connectivity to Central. These checks can help with Aruba Central inventory onboarding and assignment, but they are not the most discriminating first evidence here. Examine: Inspect replacement model compatibility, firmware, backup checksum, device identity, port map and management integration. Scenario: After a core hardware failure, operations can find archives but cannot authenticate to the replacement device.

Review archive permissions, encryption state, retention policy, sensitive fields, backup audit trail and restore rights. These checks can help with Safe configuration archiving and secret handling, but they are not the most discriminating first evidence here. Examine: Inspect replacement model compatibility, firmware, backup checksum, device identity, port map and management integration. Scenario: After a core hardware failure, operations can find archives but cannot authenticate to the replacement device.

Inspect checkpoint inventory, startup/running diff, saved exports, backup location, device-specific recovery instructions and access permissions. These checks can help with Configuration checkpoint and rollback retention, but they are not the most discriminating first evidence here. Examine: Inspect replacement model compatibility, firmware, backup checksum, device identity, port map and management integration. Scenario: After a core hardware failure, operations can find archives but cannot authenticate to the replacement device.

Prepare rack units, air flow, dual power paths, cable labeling and OOB management before powering the switching hardware. This action instead applies to Physical installation and rack power implementation. Physical readiness and power failure domains must be verified independently from logical port configuration. It does not directly resolve the controlling requirement. The targeted response is: Use per-hop VLAN and trunk inspection to locate an endpoint broadcast domain missing from the authorized path. Scenario: A subnet works within one building but stops crossing a distribution trunk after a template update.

Restore an OSPF adjacency or missing advertisement using targeted parameter, area or redistribution corrections with route verification. This action instead applies to OSPF route recovery with controlled scope. A broad redistribution change can leak unwanted networks; OSPF repair should target the proven mismatch. It does not directly resolve the controlling requirement. The targeted response is: Use per-hop VLAN and trunk inspection to locate an endpoint broadcast domain missing from the authorized path. Scenario: A subnet works within one building but stops crossing a distribution trunk after a template update.

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: Use per-hop VLAN and trunk inspection to locate an endpoint broadcast domain missing from the authorized path. Scenario: A subnet works within one building but stops crossing a distribution trunk after a template update.

Inspect polling interval, baseline trend, telemetry collection gaps, alert configuration and correlated switch counters. These checks can help with Telemetry false-positive and baseline drift analysis, but they are not the most discriminating first evidence here. Examine: Inspect PHY speed, autonegotiation, FCS/CRC, runts, cable test and optic telemetry. Scenario: A 10G uplink falls back to 1G after a switch replacement and business apps slow under normal load.

Review Central group type, effective configuration, variable bindings, supported template syntax and local override restrictions. These checks can help with Central UI group versus template configuration scope, but they are not the most discriminating first evidence here. Examine: Inspect PHY speed, autonegotiation, FCS/CRC, runts, cable test and optic telemetry. Scenario: A 10G uplink falls back to 1G after a switch replacement and business apps slow under normal load.

Inspect FIB next-hop choices, LAG hashing, flow tuples, interface member counters and return-path routes. These checks can help with Asymmetric path and ECMP hash performance analysis, but they are not the most discriminating first evidence here. Examine: Inspect PHY speed, autonegotiation, FCS/CRC, runts, cable test and optic telemetry. Scenario: A 10G uplink falls back to 1G after a switch replacement and business apps slow under normal load.

Discover supported REST versions for each switch and use compatible endpoints rather than hardcoding an obsolete API path. This action instead applies to AOS-CX REST API version discovery and compatibility. REST API resource and version compatibility vary by firmware; a valid old URI may be deprecated or unavailable. It does not directly resolve the controlling requirement. The targeted response is: Use least-privilege authenticated REST GET requests to audit switch state and avoid embedding credentials in scripts or logs. Scenario: A Python script logs the HTTPS bearer token alongside its entire request URL during switch inventory.

Monitor authentication success ratios, rejected sessions, policy role assignment and known exception endpoints by switch/site. This action instead applies to Client authentication and port-role operational reports. Auth rate and authorization role must both be checked; success in RADIUS does not guarantee usable network access. It does not directly resolve the controlling requirement. The targeted response is: Use least-privilege authenticated REST GET requests to audit switch state and avoid embedding credentials in scripts or logs. Scenario: A Python script logs the HTTPS bearer token alongside its entire request URL during switch inventory.

Differentiate a legitimate redundant STP blocked port from a physical link failure or topology loop using bridge-state evidence. This action instead applies to STP blocking and topology-loop recognition. STP discards some redundant paths by design; unexpected topology changes and MAC moves suggest a separate fault. It does not directly resolve the controlling requirement. The targeted response is: Use least-privilege authenticated REST GET requests to audit switch state and avoid embedding credentials in scripts or logs. Scenario: A Python script logs the HTTPS bearer token alongside its entire request URL during switch inventory.

Inspect ingress markings, trust mode, class map, queue mapping, device capabilities and egress counters. This step pertains to QoS DSCP trust boundary and class mapping but is not one of the two complementary decisions in this case. The required response and evidence are: Apply policing for untrusted ingress excess and shaping where controlled egress pacing is needed, selecting supported switch features. Together with: Review traffic direction, rate limits, burst settings, platform QoS resources and class-of-service monitoring. Scenario: A backup transfer experiences bursts and the engineer raises interface speed instead of investigating configured policer drops.

Configure queue weights or strict priority carefully so latency-sensitive applications receive service without starving other traffic. This step pertains to Egress queue scheduling and congestion protection but is not one of the two complementary decisions in this case. The required response and evidence are: Apply policing for untrusted ingress excess and shaping where controlled egress pacing is needed, selecting supported switch features. Together with: Review traffic direction, rate limits, burst settings, platform QoS resources and class-of-service monitoring. Scenario: A backup transfer experiences bursts and the engineer raises interface speed instead of investigating configured policer drops.

The changed variable responsible for a regression is identified or explicitly ruled out with measurable evidence. This step pertains to Operational state and baseline configuration differences but is not one of the two complementary decisions in this case. The required response and evidence are: Apply policing for untrusted ingress excess and shaping where controlled egress pacing is needed, selecting supported switch features. Together with: Review traffic direction, rate limits, burst settings, platform QoS resources and class-of-service monitoring. Scenario: A backup transfer experiences bursts and the engineer raises interface speed instead of investigating configured policer drops.

Roll out switching changes through a representative pilot, dependency validation and site-by-site acceptance instead of an unchecked big-bang change. This action instead applies to Multisite change phasing and blast radius reduction. Staged delivery contains risk and ensures site-specific exceptions are known before full deployment. It does not directly resolve the controlling requirement. The targeted response is: Attribute application loss to the actual congested egress queue and traffic class rather than only interface-level packet drops. Scenario: A newly trusted DSCP marking pushes all user traffic into one queue and other traffic stalls.

Separate ISL interruption, keepalive loss and downlink MC-LAG member faults in a VSX pair using peer-state evidence. This action instead applies to VSX peer and keepalive failure symptom isolation. Independent VSX peer control planes require distinct peer communications; ISL and keepalive carry different roles. It does not directly resolve the controlling requirement. The targeted response is: Attribute application loss to the actual congested egress queue and traffic class rather than only interface-level packet drops. Scenario: A newly trusted DSCP marking pushes all user traffic into one queue and other traffic stalls.

Trace both traffic directions, routing next hops and LAG/ECMP distribution before blaming total switch fabric capacity. This action instead applies to Asymmetric path and ECMP hash performance analysis. A link aggregate distributes by hashes; one elephant flow may not use every available member simultaneously. It does not directly resolve the controlling requirement. The targeted response is: Attribute application loss to the actual congested egress queue and traffic class rather than only interface-level packet drops. Scenario: A newly trusted DSCP marking pushes all user traffic into one queue and other traffic stalls.

Compare firmware, config diffs, CPU/memory, temperature, traffic rates and log markers for the relevant period. These checks can help with Operational state and baseline configuration differences, but they are not the most discriminating first evidence here. Examine: Inspect server status, shared secret, policy decision, client identity, session logs and effective role. Scenario: An engineer suggests disabling every port's 802.1X policy while investigating one legacy printer's failure.

Inspect marked packets, ingress trust, queue drops, egress scheduling and application performance. These checks can help with QoS classification repair with before/after measures, but they are not the most discriminating first evidence here. Examine: Inspect server status, shared secret, policy decision, client identity, session logs and effective role. Scenario: An engineer suggests disabling every port's 802.1X policy while investigating one legacy printer's failure.

Inspect ingress VRF, SVI assignment, per-VRF routes, next-hop resolution, leak policy and permitted firewall path. These checks can help with VRF route-table mismatch investigation, but they are not the most discriminating first evidence here. Examine: Inspect server status, shared secret, policy decision, client identity, session logs and effective role. Scenario: An engineer suggests disabling every port's 802.1X policy while investigating one legacy printer's failure.

Review OSPF neighbor state, area, timers, MTU, authentication, interface network type and installed routes. These checks can help with OSPF neighbor and route missing root cause, but they are not the most discriminating first evidence here. Examine: Review model firmware compatibility, known issues, rollback image, maintenance window and regression test plan. Scenario: A campus core upgrade completes but the team never verifies post-boot peer synchronization or saved configurations.

Inspect PHY speed, autonegotiation, FCS/CRC, runts, cable test and optic telemetry. These checks can help with Duplex speed and physical error performance analysis, but they are not the most discriminating first evidence here. Examine: Review model firmware compatibility, known issues, rollback image, maintenance window and regression test plan. Scenario: A campus core upgrade completes but the team never verifies post-boot peer synchronization or saved configurations.

Compare installation photos, running and startup configs, topology neighbors, asset inventory and exception log. These checks can help with Change documentation and as-built reconciliation, but they are not the most discriminating first evidence here. Examine: Review model firmware compatibility, known issues, rollback image, maintenance window and regression test plan. Scenario: A campus core upgrade completes but the team never verifies post-boot peer synchronization or saved configurations.

Inspect desired versus running settings, group assignments, local overrides, timestamps and change-owner approvals. These checks can help with Centralized configuration drift audit, but they are not the most discriminating first evidence here. Examine: Check enabled management services by VRF, ACLs, user roles, TLS/SSH settings, logging, NTP and out-of-band recovery. Scenario: Operations loses SSH access after changing the management VLAN with no console fallback plan.

Inspect running versus startup configuration, checkpoint inventory, change timestamp and planned rollback commands. These checks can help with AOS-CX configuration save and checkpoint workflow, but they are not the most discriminating first evidence here. Examine: Check enabled management services by VRF, ACLs, user roles, TLS/SSH settings, logging, NTP and out-of-band recovery. Scenario: Operations loses SSH access after changing the management VLAN with no console fallback plan.

Inspect root bridge ID, port roles, path cost, MST region consistency and topology change counters. These checks can help with RSTP or MSTP bridge and port role control, but they are not the most discriminating first evidence here. Examine: Check enabled management services by VRF, ACLs, user roles, TLS/SSH settings, logging, NTP and out-of-band recovery. Scenario: Operations loses SSH access after changing the management VLAN with no console fallback plan.

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: Identify whether excessive routing updates, loop events or monitoring jobs are consuming CPU and affecting network stability. Scenario: A Layer 2 loop creates repeated MAC relearning and process utilization rises sharply.

Use VRF-specific routing and interface evidence to diagnose why an otherwise valid prefix is unreachable from a particular context. This action instead applies to VRF route-table mismatch investigation. A route in one VRF is not visible to another merely because a VLAN exists on the same chassis. It does not directly resolve the controlling requirement. The targeted response is: Identify whether excessive routing updates, loop events or monitoring jobs are consuming CPU and affecting network stability. Scenario: A Layer 2 loop creates repeated MAC relearning and process utilization rises sharply.

Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. This action instead applies to Multicast flooding and receiver path performance. Multicast forwarding depends on group state and querier or PIM control, not merely the VLAN number. It does not directly resolve the controlling requirement. The targeted response is: Identify whether excessive routing updates, loop events or monitoring jobs are consuming CPU and affecting network stability. Scenario: A Layer 2 loop creates repeated MAC relearning and process utilization rises sharply.

Examine egress buffer occupancy and queue allocation for traffic-class contention rather than interpreting all latency as routing delay. This action instead applies to Packet buffer pressure and head-of-line impact. Buffer pressure reflects contention and bursting; an untested priority adjustment can shift rather than solve loss. It does not directly resolve the controlling requirement. The targeted response is: Configure the appropriate spanning tree mode and root placement for the Layer 2 topology, then verify alternate-port behavior. Scenario: Two switches in the same MST region use different revision or VLAN mappings and show boundary behavior.

Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. This action instead applies to Access VLAN and trunk allowed-list design. Native or untagged VLAN behavior and tagged VLAN allowance must agree across both ends of a trunk. It does not directly resolve the controlling requirement. The targeted response is: Configure the appropriate spanning tree mode and root placement for the Layer 2 topology, then verify alternate-port behavior. Scenario: Two switches in the same MST region use different revision or VLAN mappings and show boundary behavior.

Coordinate 802.1X authorization with an approved network access policy platform and verify returned VLAN or role attributes. This action instead applies to ClearPass or identity-service policy integration. An identity server may accept credentials while issuing incorrect network authorization attributes. It does not directly resolve the controlling requirement. The targeted response is: Configure the appropriate spanning tree mode and root placement for the Layer 2 topology, then verify alternate-port behavior. Scenario: Two switches in the same MST region use different revision or VLAN mappings and show boundary behavior.