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The failed physical segment or module is identified and replaced or repaired, restoring a stable error-free link. This step pertains to Physical link failure diagnostics but is not one of the two complementary decisions in this case. The required response and evidence are: Validate AOS-CX configuration templates against supported platform variants and preproduction devices before broad rollout. Together with: Check template parameter coverage, model firmware, intended diffs, test switch result, scope and staged deployment audit. Scenario: A site-specific gateway variable is blank and the template deploys an incomplete SVI to dozens of branches.

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: Validate AOS-CX configuration templates against supported platform variants and preproduction devices before broad rollout. Together with: Check template parameter coverage, model firmware, intended diffs, test switch result, scope and staged deployment audit. Scenario: A site-specific gateway variable is blank and the template deploys an incomplete SVI to dozens of branches.

Establish prechange checkpoints, defined retention and restore testing for AOS-CX configuration changes across managed devices. This step pertains to Configuration checkpoint and rollback retention but is not one of the two complementary decisions in this case. The required response and evidence are: Validate AOS-CX configuration templates against supported platform variants and preproduction devices before broad rollout. Together with: Check template parameter coverage, model firmware, intended diffs, test switch result, scope and staged deployment audit. Scenario: A site-specific gateway variable is blank and the template deploys an incomplete SVI to dozens of branches.

Check change owner, impact window, outage dependencies, test plan, rollback threshold and service notification record. These checks can help with Scheduled change window and impact communication, but they are not the most discriminating first evidence here. Examine: Review archive permissions, encryption state, retention policy, sensitive fields, backup audit trail and restore rights. Scenario: A branch backup upload uses a plaintext file share accessible by all employees.

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: Review archive permissions, encryption state, retention policy, sensitive fields, backup audit trail and restore rights. Scenario: A branch backup upload uses a plaintext file share accessible by all employees.

Check endpoint identity, allowed MAC profiles, primary 802.1X attempts, fallback order, authentication timeout and role policy. These checks can help with MAC authentication and critical access fallback, but they are not the most discriminating first evidence here. Examine: Review archive permissions, encryption state, retention policy, sensitive fields, backup audit trail and restore rights. Scenario: A branch backup upload uses a plaintext file share accessible by all employees.

Inspect VSX peer role, keepalive state, ISL counters, MAC or VLAN synchronization and downstream LAG state. These checks can help with VSX peer and keepalive failure symptom isolation, but they are not the most discriminating first evidence here. Examine: Review NAE script/agent availability, monitored REST URI, alert condition, historical timeline, privileges and resource impact. Scenario: An NAE script is installed on a switch series that does not support the referenced metric and shows no history.

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: Review NAE script/agent availability, monitored REST URI, alert condition, historical timeline, privileges and resource impact. Scenario: An NAE script is installed on a switch series that does not support the referenced metric and shows no history.

Inspect time source, log severity, event chronology, switch identity, syslog delivery and related config changes. These checks can help with AOS-CX log event and timestamp correlation, but they are not the most discriminating first evidence here. Examine: Review NAE script/agent availability, monitored REST URI, alert condition, historical timeline, privileges and resource impact. Scenario: An NAE script is installed on a switch series that does not support the referenced metric and shows no history.

Examine target release notes, known issues, platform compatibility, upgrade path, image bank and postboot feature tests. These checks can help with Firmware maintenance compatibility and image fallback, but they are not the most discriminating first evidence here. Examine: Inspect local/remote port IDs, system descriptions, LLDP freshness, link MACs and expected cable map. Scenario: A switch marked as Building A distribution reveals a neighbor from another building on its labeled uplink.

Compare serials, firmware, management tenant, location, replacement spares, support expiration and asset owner. These checks can help with Inventory and licensing lifecycle control, but they are not the most discriminating first evidence here. Examine: Inspect local/remote port IDs, system descriptions, LLDP freshness, link MACs and expected cable map. Scenario: A switch marked as Building A distribution reveals a neighbor from another building on its labeled uplink.

Inspect Central topology, device status, telemetry collection, event timestamps, access roles and alert forwarding. These checks can help with Aruba Central and switch telemetry integration, but they are not the most discriminating first evidence here. Examine: Inspect local/remote port IDs, system descriptions, LLDP freshness, link MACs and expected cable map. Scenario: A switch marked as Building A distribution reveals a neighbor from another building on its labeled uplink.

Archive switch configs with encryption, retention and least-privilege access while avoiding uncontrolled exposure of shared credentials or tokens. This step pertains to Safe configuration archiving and secret handling but is not one of the two complementary decisions in this case. The required response and evidence are: Maintain approved maintenance records, affected path inventory, user notices and postchange validation for recurring wired network work. Together with: Check change owner, impact window, outage dependencies, test plan, rollback threshold and service notification record. Scenario: A minor interface renumbering inadvertently disconnects an emergency paging VLAN that was omitted from impact review.

The switch appears under the approved management tenant with authorized functions and documented ongoing entitlement. This step pertains to Campus management and licensing boundaries but is not one of the two complementary decisions in this case. The required response and evidence are: Maintain approved maintenance records, affected path inventory, user notices and postchange validation for recurring wired network work. Together with: Check change owner, impact window, outage dependencies, test plan, rollback threshold and service notification record. Scenario: A minor interface renumbering inadvertently disconnects an emergency paging VLAN that was omitted from impact review.

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: Maintain approved maintenance records, affected path inventory, user notices and postchange validation for recurring wired network work. Together with: Check change owner, impact window, outage dependencies, test plan, rollback threshold and service notification record. Scenario: A minor interface renumbering inadvertently disconnects an emergency paging VLAN that was omitted from impact review.

Inspect multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. These checks can help with Multicast flooding and receiver path performance, but they are not the most discriminating first evidence here. Examine: Inspect process CPU over time, event logs, topology change rate, protocol adjacency resets and agent schedules. Scenario: A Layer 2 loop creates repeated MAC relearning and process utilization rises sharply.

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 process CPU over time, event logs, topology change rate, protocol adjacency resets and agent schedules. Scenario: A Layer 2 loop creates repeated MAC relearning and process utilization rises sharply.

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: Inspect process CPU over time, event logs, topology change rate, protocol adjacency resets and agent schedules. Scenario: A Layer 2 loop creates repeated MAC relearning and process utilization rises sharply.

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 port role, connected device, received BPDU counters, configured guard behavior and recovery policy. Scenario: An operator enables edge-port BPDU guard on a distribution trunk and the port disables upon receiving legitimate control frames.

Inspect hello and dead intervals, area ID, authentication, MTU, network type, neighbor state and OSPF routes. These checks can help with OSPF adjacency and area configuration, but they are not the most discriminating first evidence here. Examine: Inspect port role, connected device, received BPDU counters, configured guard behavior and recovery policy. Scenario: An operator enables edge-port BPDU guard on a distribution trunk and the port disables upon receiving legitimate control frames.

Review endpoint counts by class, anticipated additions, PoE budgets and uplink utilization peaks. These checks can help with Port density and growth headroom, but they are not the most discriminating first evidence here. Examine: Inspect port role, connected device, received BPDU counters, configured guard behavior and recovery policy. Scenario: An operator enables edge-port BPDU guard on a distribution trunk and the port disables upon receiving legitimate control frames.

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: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Scenario: Two trunk peers disagree on native VLAN and management packets enter the wrong broadcast domain.

Validate PoE power supply capacity, cable pairs and endpoint class before activating powered devices or redundant PSU policies. This action instead applies to Power and PoE field commissioning. Available Ethernet ports do not imply sufficient PoE watt capacity, and redundant power modules must be matched to the intended load. It does not directly resolve the controlling requirement. The targeted response is: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Scenario: Two trunk peers disagree on native VLAN and management packets enter the wrong broadcast domain.

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: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Scenario: Two trunk peers disagree on native VLAN and management packets enter the wrong broadcast domain.

Measure routing neighbor uptime, route churn and failover behavior across OSPF or BGP rather than relying on one point-in-time state. This action instead applies to Routing adjacency and convergence telemetry interpretation. A control-plane neighbor marked up now may still have repeatedly flapped and caused service interruptions earlier. 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: Large file transfers cause egress buffer exhaustion when small interactive transactions share a congested class.

Repair a proven VRF interface assignment or route leak rule while preventing unrelated tenant reachability. This action instead applies to VRF and route-leak correction. A route-leak fix must honor segmentation; moving every interface into the default VRF is not acceptable. 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: Large file transfers cause egress buffer exhaustion when small interactive transactions share a congested class.

Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. This action instead applies to OSPF neighbor and route missing root cause. OSPF FULL is a control-plane milestone; missing connected networks or rejected LSAs can still prevent reachability. 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: Large file transfers cause egress buffer exhaustion when small interactive transactions share a congested class.

Inspect pilot scope, affected VLANs, critical service hours, change batches, spare equipment and rollback readiness. These checks can help with Multisite change phasing and blast radius reduction, 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: An enterprise purchases switches and expects every Aruba Central analytics feature without a management subscription.

Check interface-to-interface maps, VSX ISL or VSF links, keepalive transport, LAG membership and independent power routes. These checks can help with Resilient peer cabling and link map, 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: An enterprise purchases switches and expects every Aruba Central analytics feature without a management subscription.

Review model firmware compatibility, known issues, rollback image, maintenance window and regression test plan. These checks can help with Validation-first firmware defect remediation, 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: An enterprise purchases switches and expects every Aruba Central analytics feature without a management subscription.

The specific workload driving CPU spikes is isolated and reduced while valid control-plane features remain enabled. This step pertains to High CPU and control-plane protocol churn but is not one of the two complementary decisions in this case. The required response and evidence are: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Together with: Inspect VLAN inventory, per-interface native versus tagged behavior, allowed VLANs and peer trunk configuration. Scenario: A host connected to an untagged access port receives an unexpected guest VLAN because port mode was changed.

Use supported AOS-CX API endpoints and role-scoped service accounts for automations, separating read-only audits from approved changes. This step pertains to REST API and configuration-tool integration boundaries but is not one of the two complementary decisions in this case. The required response and evidence are: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Together with: Inspect VLAN inventory, per-interface native versus tagged behavior, allowed VLANs and peer trunk configuration. Scenario: A host connected to an untagged access port receives an unexpected guest VLAN because port mode was changed.

Check VLAN active members, SVI IP prefix, routing state, VRF membership, connected routes and ARP/ND entries. This step pertains to SVI and routed interface gateway configuration but is not one of the two complementary decisions in this case. The required response and evidence are: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Together with: Inspect VLAN inventory, per-interface native versus tagged behavior, allowed VLANs and peer trunk configuration. Scenario: A host connected to an untagged access port receives an unexpected guest VLAN because port mode was changed.