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Record deliberate changes in running configuration, save the intended startup state and use checkpoints or diffs as an auditable rollback option. This action instead applies to AOS-CX configuration save and checkpoint workflow. A running change does not become a persistent boot baseline automatically without the appropriate save process. It does not directly resolve the controlling requirement. The targeted response is: Use the correct AOS-CX interface context and verify administrative state, speed and VLAN mode rather than reusing unrelated switch-vendor syntax. Scenario: An operator pastes legacy switch CLI for a trunk and AOS-CX rejects or misinterprets it.

Identify whether excessive routing updates, loop events or monitoring jobs are consuming CPU and affecting network stability. This action instead applies to High CPU and control-plane protocol churn. High CPU does not by itself prove traffic forwarding hardware is saturated; event correlation is necessary. It does not directly resolve the controlling requirement. The targeted response is: Use the correct AOS-CX interface context and verify administrative state, speed and VLAN mode rather than reusing unrelated switch-vendor syntax. Scenario: An operator pastes legacy switch CLI for a trunk and AOS-CX rejects or misinterprets it.

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: Use the correct AOS-CX interface context and verify administrative state, speed and VLAN mode rather than reusing unrelated switch-vendor syntax. Scenario: An operator pastes legacy switch CLI for a trunk and AOS-CX rejects or misinterprets it.

Validate AOS-CX configuration templates against supported platform variants and preproduction devices before broad rollout. This action instead applies to Config template test and promotion pipeline. Templating improves consistency but unscoped variables can replicate errors across entire fleets. It does not directly resolve the controlling requirement. The targeted response is: Compare deployed AOS-CX configurations against approved Aruba Central templates or version-controlled intended state and record exceptions. Scenario: A port-security setting differs across identical access closets after an emergency manual exception.

Use LLDP neighbor data and interface inventories to verify connected peers and document the physical campus topology. This action instead applies to LLDP topology and neighbor mapping. LLDP is discovery evidence but neighbor advertisements do not prove the entire end-to-end forwarding path is authorized. It does not directly resolve the controlling requirement. The targeted response is: Compare deployed AOS-CX configurations against approved Aruba Central templates or version-controlled intended state and record exceptions. Scenario: A port-security setting differs across identical access closets after an emergency manual exception.

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: Compare deployed AOS-CX configurations against approved Aruba Central templates or version-controlled intended state and record exceptions. Scenario: A port-security setting differs across identical access closets after an emergency manual exception.

Determine whether an access stack, multi-chassis VSX pair or independent routed switch pair best satisfies topology and failure-control objectives. This step pertains to Resiliency capability evaluation VSX and VSF but is not one of the two complementary decisions in this case. The required response and evidence are: Schedule VLAN creation, trunk allowance, SVI services and routing prerequisites before switching live endpoint traffic. Together with: Inspect allowed VLAN lists, IP plans, gateway addresses, routes and dependency owners at each change stage. Scenario: An engineer migrates endpoint access VLANs before extending those VLANs across the new uplink trunk.

An automation job reads supported configuration and state consistently across targeted platforms with version-aware error handling. This step pertains to AOS-CX REST API version discovery and compatibility but is not one of the two complementary decisions in this case. The required response and evidence are: Schedule VLAN creation, trunk allowance, SVI services and routing prerequisites before switching live endpoint traffic. Together with: Inspect allowed VLAN lists, IP plans, gateway addresses, routes and dependency owners at each change stage. Scenario: An engineer migrates endpoint access VLANs before extending those VLANs across the new uplink trunk.

Compare slot inventory, supported modules, forwarding capacity, supervisor architecture, footprint, and lifecycle support. This step pertains to Modular core chassis versus fixed form factor but is not one of the two complementary decisions in this case. The required response and evidence are: Schedule VLAN creation, trunk allowance, SVI services and routing prerequisites before switching live endpoint traffic. Together with: Inspect allowed VLAN lists, IP plans, gateway addresses, routes and dependency owners at each change stage. Scenario: An engineer migrates endpoint access VLANs before extending those VLANs across the new uplink trunk.

Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. This action instead applies to PIM and multicast routed-path validation. IGMP at the edge and PIM in the routed network perform different multicast roles; successful unicast ping does not prove multicast routing. It does not directly resolve the controlling requirement. The targeted response is: Implement a supported VSF topology with consistent member identities, stack links and role expectations, and validate member failover. Scenario: A new access stack member is assigned the same logical identifier as a live member and fails to join.

Correct QoS trust, classification and queue mapping on the affected path, then compare loss and latency under representative load. This action instead applies to QoS classification repair with before/after measures. End-to-end QoS success requires traffic markings and queue treatment; increasing link speed may mask misclassification temporarily. It does not directly resolve the controlling requirement. The targeted response is: Implement a supported VSF topology with consistent member identities, stack links and role expectations, and validate member failover. Scenario: A new access stack member is assigned the same logical identifier as a live member and fails to join.

Restrict SSH, HTTPS and management VRF exposure and apply individual authenticated administrator roles before enabling remote management. This action instead applies to AOS-CX secure management access setup. Secure management requires both service availability and scoped authorization; turning on HTTPS on every VRF is not a required convenience. It does not directly resolve the controlling requirement. The targeted response is: Implement a supported VSF topology with consistent member identities, stack links and role expectations, and validate member failover. Scenario: A new access stack member is assigned the same logical identifier as a live member and fails to join.

Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. These checks can help with IGMP snooping L2 multicast receiver control, but they are not the most discriminating first evidence here. Examine: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.

Inspect port role, connected device, received BPDU counters, configured guard behavior and recovery policy. These checks can help with BPDU guard and edge port hardening, but they are not the most discriminating first evidence here. Examine: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.

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: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.

Check template parameter coverage, model firmware, intended diffs, test switch result, scope and staged deployment audit. These checks can help with Config template test and promotion pipeline, but they are not the most discriminating first evidence here. Examine: Inspect counter rates, monitoring interval, interface speed, burst peaks, growth trend and service-level effects. Scenario: A campus uplink averages 20% use but spikes near full capacity during class changes.

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 counter rates, monitoring interval, interface speed, burst peaks, growth trend and service-level effects. Scenario: A campus uplink averages 20% use but spikes near full capacity during class changes.

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 counter rates, monitoring interval, interface speed, burst peaks, growth trend and service-level effects. Scenario: A campus uplink averages 20% use but spikes near full capacity during class changes.

Discover supported REST versions for each switch and use compatible endpoints rather than hardcoding an obsolete API path. This step pertains to AOS-CX REST API version discovery and compatibility but is not one of the two complementary decisions in this case. The required response and evidence are: Use sensor, PSU, fan and PoE state to identify hardware conditions that threaten switching service continuity. Together with: Check temperature sensors, fan speed alarms, power supply redundancy, PoE consumption and event history. Scenario: A campus closet overheats after ventilation changes and several switch ports begin flapping.

Review API role, HTTPS service VRF, TLS validation, token storage, resource responses and request logs. This step pertains to Read-only REST audit and secure token handling but is not one of the two complementary decisions in this case. The required response and evidence are: Use sensor, PSU, fan and PoE state to identify hardware conditions that threaten switching service continuity. Together with: Check temperature sensors, fan speed alarms, power supply redundancy, PoE consumption and event history. Scenario: A campus closet overheats after ventilation changes and several switch ports begin flapping.

The retry source and server bottleneck are isolated with sessions stabilizing and intended access policy retained. This step pertains to Authentication storms and endpoint retry load but is not one of the two complementary decisions in this case. The required response and evidence are: Use sensor, PSU, fan and PoE state to identify hardware conditions that threaten switching service continuity. Together with: Check temperature sensors, fan speed alarms, power supply redundancy, PoE consumption and event history. Scenario: A campus closet overheats after ventilation changes and several switch ports begin flapping.

Inspect switch firmware, GET /rest reported versions, authorization, resource URI and response shape. These checks can help with AOS-CX REST API version discovery and compatibility, but they are not the most discriminating first evidence here. Examine: Inspect per-VRF interface ownership, route table, import/export controls and packet path security enforcement. Scenario: An internal app loses access after an SVI is migrated into the management VRF inadvertently.

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 per-VRF interface ownership, route table, import/export controls and packet path security enforcement. Scenario: An internal app loses access after an SVI is migrated into the management VRF inadvertently.

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 per-VRF interface ownership, route table, import/export controls and packet path security enforcement. Scenario: An internal app loses access after an SVI is migrated into the management VRF inadvertently.

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: Distinguish loss of light or cabling/optic errors from configuration faults using interface and transceiver diagnostics before changing routing policy. Scenario: An access port reports intermittent CRC spikes after a contractor crimps a new copper termination.

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: Distinguish loss of light or cabling/optic errors from configuration faults using interface and transceiver diagnostics before changing routing policy. Scenario: An access port reports intermittent CRC spikes after a contractor crimps a new copper termination.

Apply supported access-edge protection such as DHCP snooping, ARP inspection or MAC controls where appropriate and validate trust boundaries. This action instead applies to Port security and DHCP/ARP spoofing defenses. Trusting all access ports undermines spoofing defenses; setting uplink trust without verifying bindings can also disrupt service. It does not directly resolve the controlling requirement. The targeted response is: Distinguish loss of light or cabling/optic errors from configuration faults using interface and transceiver diagnostics before changing routing policy. Scenario: An access port reports intermittent CRC spikes after a contractor crimps a new copper termination.

The deployed switch supports expected expansion without immediate port exhaustion, power shedding or oversubscribed uplinks. This result is associated with Port density and growth headroom; it does not demonstrate the requested network behavior. The relevant acceptance test is: Pilot endpoints retain expected access as the path moves to the new switches and routing boundaries. Scenario: A site activates new routed gateways without checking upstream return routes.

The end-to-end link establishes at the intended speed with acceptable power levels and no unsupported optics alarms. This result is associated with Optical and copper media compatibility; it does not demonstrate the requested network behavior. The relevant acceptance test is: Pilot endpoints retain expected access as the path moves to the new switches and routing boundaries. Scenario: A site activates new routed gateways without checking upstream return routes.

The link stabilizes with no recurring CRC/LOS errors and normal forwarding on the intended path. This result is associated with Optic and port fault replacement strategy; it does not demonstrate the requested network behavior. The relevant acceptance test is: Pilot endpoints retain expected access as the path moves to the new switches and routing boundaries. Scenario: A site activates new routed gateways without checking upstream return routes.

Voice and interactive traffic retain appropriate treatment without allowing untrusted endpoints to claim highest priority unchecked. This result is associated with QoS DSCP trust boundary and class mapping; it does not demonstrate the requested network behavior. The relevant acceptance test is: Excess traffic is handled by the intended rate-control mechanism without mislabeling an egress bottleneck as a link fault. Scenario: A switch is expected to shape traffic on a platform or interface mode without verifying that feature support exists.

An agent generates a reproducible actionable alert for the intended degradation without excessive false positives or device load. This result is associated with NAE agent and threshold monitoring; it does not demonstrate the requested network behavior. The relevant acceptance test is: Excess traffic is handled by the intended rate-control mechanism without mislabeling an egress bottleneck as a link fault. Scenario: A switch is expected to shape traffic on a platform or interface mode without verifying that feature support exists.

Hosts reach the correct local gateway and remote networks over intended routing context without overlapping prefixes. This result is associated with SVI and routed interface gateway configuration; it does not demonstrate the requested network behavior. The relevant acceptance test is: Excess traffic is handled by the intended rate-control mechanism without mislabeling an egress bottleneck as a link fault. Scenario: A switch is expected to shape traffic on a platform or interface mode without verifying that feature support exists.