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Confirm required AOS-CX capabilities against exact switch series and firmware before committing to routing, overlays or security services. This action instead applies to AOS-CX feature and software compatibility matrix. AOS-CX is a software family but not every feature is universal across all product series and releases. It does not directly resolve the controlling requirement. The targeted response is: Use approved MAC authentication or critical-role treatment for devices lacking supplicants with explicit limited privileges and monitoring. Scenario: When RADIUS is unreachable every device receives an unrestricted role, defeating the site's isolation policy.

Apply group-level switching policies only after confirming device model compatibility and whether the site is UI-group or template-group managed. This action instead applies to Central UI group versus template configuration scope. Template and UI group management workflows are not interchangeable, especially for device-specific variable substitution. It does not directly resolve the controlling requirement. The targeted response is: Use approved MAC authentication or critical-role treatment for devices lacking supplicants with explicit limited privileges and monitoring. Scenario: When RADIUS is unreachable every device receives an unrestricted role, defeating the site's isolation policy.

Create LAG groups with matching LACP negotiation, physical rates, VLAN configuration and supported hash behavior. This action instead applies to LACP link aggregation member consistency. LACP forms an aggregate only when the peer and member attributes are compatible; wiring two cables is not proof of bundling. It does not directly resolve the controlling requirement. The targeted response is: Use approved MAC authentication or critical-role treatment for devices lacking supplicants with explicit limited privileges and monitoring. Scenario: When RADIUS is unreachable every device receives an unrestricted role, defeating the site's isolation policy.

During congestion, supported critical traffic stays within service targets while lower-priority traffic is controlled predictably. This result is associated with Egress queue scheduling and congestion protection; it does not demonstrate the requested network behavior. The relevant acceptance test is: Permitted devices authenticate into approved access profiles while failed authentication has defined limited access. Scenario: A finance laptop has link up but remains unauthorized because RADIUS traffic is blocked on the management path.

The specific VSX fault domain is identified with safe recovery steps, not a blind dual-reboot. This result is associated with VSX peer and keepalive failure symptom isolation; it does not demonstrate the requested network behavior. The relevant acceptance test is: Permitted devices authenticate into approved access profiles while failed authentication has defined limited access. Scenario: A finance laptop has link up but remains unauthorized because RADIUS traffic is blocked on the management path.

Rogue network services are blocked at untrusted edges without disrupting legitimate DHCP or ARP exchanges. This result is associated with Port security and DHCP/ARP spoofing defenses; it does not demonstrate the requested network behavior. The relevant acceptance test is: Permitted devices authenticate into approved access profiles while failed authentication has defined limited access. Scenario: A finance laptop has link up but remains unauthorized because RADIUS traffic is blocked on the management path.

Confirm required AOS-CX capabilities against exact switch series and firmware before committing to routing, overlays or security services. This action instead applies to AOS-CX feature and software compatibility matrix. AOS-CX is a software family but not every feature is universal across all product series and releases. It does not directly resolve the controlling requirement. The targeted response is: Maintain accurate switch asset inventory, optics, warranty, software versions, support contract and management license state. Scenario: An optic swap is not recorded and a future technician orders the wrong replacement for the inter-building link.

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: Maintain accurate switch asset inventory, optics, warranty, software versions, support contract and management license state. Scenario: An optic swap is not recorded and a future technician orders the wrong replacement for the inter-building link.

Build an operational view correlating site reachability, interface error state, routing stability and user impact for prioritized response. This action instead applies to Troubleshooting evidence dashboard and incident triage. A good operations dashboard links measurements to service impact; it cannot autonomously declare the root cause proven. It does not directly resolve the controlling requirement. The targeted response is: Maintain accurate switch asset inventory, optics, warranty, software versions, support contract and management license state. Scenario: An optic swap is not recorded and a future technician orders the wrong replacement for the inter-building link.

Map every customer requirement to an implementation control, validation evidence, accountable owner and acceptable failure behavior. This step pertains to Requirements-to-configuration traceability matrix but is not one of the two complementary decisions in this case. The required response and evidence are: Create a controlled activation and validation order for routing peers, route redistribution and default gateway reachability. Together with: Examine OSPF or BGP peer parameters, VRFs, route policies, prefix tables and expected reconvergence time. Scenario: A cutover establishes OSPF neighbors but upstream default route is missing on the new switch.

The physical link comes up reliably at intended speed with optical levels in supported range and no recurring errors. This step pertains to Optic insertion and physical layer preflight but is not one of the two complementary decisions in this case. The required response and evidence are: Create a controlled activation and validation order for routing peers, route redistribution and default gateway reachability. Together with: Examine OSPF or BGP peer parameters, VRFs, route policies, prefix tables and expected reconvergence time. Scenario: A cutover establishes OSPF neighbors but upstream default route is missing on the new switch.

Examine site topology, switch count, uplink capacity, failure domains and convergence requirements. This step pertains to Branch distribution and collapse-core topology selection but is not one of the two complementary decisions in this case. The required response and evidence are: Create a controlled activation and validation order for routing peers, route redistribution and default gateway reachability. Together with: Examine OSPF or BGP peer parameters, VRFs, route policies, prefix tables and expected reconvergence time. Scenario: A cutover establishes OSPF neighbors but upstream default route is missing on the new switch.

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: Inspect license tiers, serial entitlement, firmware support, account ownership and permitted network access. Scenario: A remote branch lacks approved outbound management connectivity although the design assumes centralized cloud provisioning.

Review NAE script/agent availability, monitored REST URI, alert condition, historical timeline, privileges and resource impact. These checks can help with NAE agent and threshold monitoring, but they are not the most discriminating first evidence here. Examine: Inspect license tiers, serial entitlement, firmware support, account ownership and permitted network access. Scenario: A remote branch lacks approved outbound management connectivity although the design assumes centralized cloud provisioning.

Inspect identity server reachability, time synchronization, EAP settings, downloadable role support, exceptions and emergency access. These checks can help with Security and authentication migration coordination, but they are not the most discriminating first evidence here. Examine: Inspect license tiers, serial entitlement, firmware support, account ownership and permitted network access. Scenario: A remote branch lacks approved outbound management connectivity although the design assumes centralized cloud provisioning.

The failed physical segment or module is identified and replaced or repaired, restoring a stable error-free link. This result is associated with Physical link failure diagnostics; it does not demonstrate the requested network behavior. The relevant acceptance test is: The correct DHCP response traverses the client access path without allowing rogue servers. Scenario: A guest DHCP relay points to a retired server while the local access VLAN remains up.

Automation reads or modifies only authorized switch resources with a confirmable result and rollback option. This result is associated with REST API and configuration-tool integration boundaries; it does not demonstrate the requested network behavior. The relevant acceptance test is: The correct DHCP response traverses the client access path without allowing rogue servers. Scenario: A guest DHCP relay points to a retired server while the local access VLAN remains up.

The affected host reaches the intended gateway and permitted routed networks with no address conflicts. This result is associated with IP addressing subnet and gateway mismatch; it does not demonstrate the requested network behavior. The relevant acceptance test is: The correct DHCP response traverses the client access path without allowing rogue servers. Scenario: A guest DHCP relay points to a retired server while the local access VLAN remains up.

Approved administrators can manage devices through intended protected paths while unauthorized networks are denied. This result is associated with AOS-CX secure management access setup; it does not demonstrate the requested network behavior. The relevant acceptance test is: A legacy device gains only the intended restricted access while unauthorized MACs do not inherit broad corporate privileges. Scenario: When RADIUS is unreachable every device receives an unrestricted role, defeating the site's isolation policy.

Only intended broadcast domains traverse the uplink and access clients receive correct VLAN assignment. This result is associated with Access VLAN and trunk allowed-list design; it does not demonstrate the requested network behavior. The relevant acceptance test is: A legacy device gains only the intended restricted access while unauthorized MACs do not inherit broad corporate privileges. Scenario: When RADIUS is unreachable every device receives an unrestricted role, defeating the site's isolation policy.

New templates apply correctly to pilot devices and promote only after peer, VLAN and role acceptance gates pass. This result is associated with Config template test and promotion pipeline; it does not demonstrate the requested network behavior. The relevant acceptance test is: A legacy device gains only the intended restricted access while unauthorized MACs do not inherit broad corporate privileges. Scenario: When RADIUS is unreachable every device receives an unrestricted role, defeating the site's isolation policy.

Review maintenance approval, baselines, device access, console recovery, config backups, support contacts and rollback triggers. This step pertains to Implementation plan preflight and rollback criteria but is not one of the two complementary decisions in this case. The required response and evidence are: Prepare rack units, air flow, dual power paths, cable labeling and OOB management before powering the switching hardware. Together with: Review site power circuits, PSU ratings, environmental constraints, rack elevations and OOB console reachability. Scenario: A remote closet goes live with no documented out-of-band recovery option for a failed configuration.

Create a controlled activation and validation order for routing peers, route redistribution and default gateway reachability. This step pertains to Routing and convergence implementation gates but is not one of the two complementary decisions in this case. The required response and evidence are: Prepare rack units, air flow, dual power paths, cable labeling and OOB management before powering the switching hardware. Together with: Review site power circuits, PSU ratings, environmental constraints, rack elevations and OOB console reachability. Scenario: A remote closet goes live with no documented out-of-band recovery option for a failed configuration.

Operators detect abnormal environment or power faults early and verify that redundant components protect the intended load. This step pertains to Environmental and power health monitoring but is not one of the two complementary decisions in this case. The required response and evidence are: Prepare rack units, air flow, dual power paths, cable labeling and OOB management before powering the switching hardware. Together with: Review site power circuits, PSU ratings, environmental constraints, rack elevations and OOB console reachability. Scenario: A remote closet goes live with no documented out-of-band recovery option for a failed configuration.

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: Examine egress buffer occupancy and queue allocation for traffic-class contention rather than interpreting all latency as routing delay. Scenario: A traffic-engineering change reserves nearly all output queue resources for one low-volume priority service.

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: Examine egress buffer occupancy and queue allocation for traffic-class contention rather than interpreting all latency as routing delay. Scenario: A traffic-engineering change reserves nearly all output queue resources for one low-volume priority service.

Archive switch configs with encryption, retention and least-privilege access while avoiding uncontrolled exposure of shared credentials or tokens. This action instead applies to Safe configuration archiving and secret handling. Configuration histories may contain secrets and management details, so backup security is part of switch operations. It does not directly resolve the controlling requirement. The targeted response is: Examine egress buffer occupancy and queue allocation for traffic-class contention rather than interpreting all latency as routing delay. Scenario: A traffic-engineering change reserves nearly all output queue resources for one low-volume priority service.

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 peak counters, buffers, burst duration, port rates, packet loss and affected application flows. Scenario: An aggregate reports 40% average load but short backup bursts cause transient packet drops.

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 peak counters, buffers, burst duration, port rates, packet loss and affected application flows. Scenario: An aggregate reports 40% average load but short backup bursts cause transient packet drops.

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 peak counters, buffers, burst duration, port rates, packet loss and affected application flows. Scenario: An aggregate reports 40% average load but short backup bursts cause transient packet drops.

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.