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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.

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: Form a remediation sequence from observed baseline, known-good checkpoint, expected impact and verification steps rather than changing multiple controls at once. Scenario: A repair script changes routing, authentication and QoS in one batch so no engineer can attribute the recovery.

Configure VLAN SVIs or routed physical interfaces within the correct VRF and validate address, administrative status and neighbor reachability. This action instead applies to SVI and routed interface gateway configuration. An SVI can be configured while remaining unable to forward if its VLAN or routing context is not operational. It does not directly resolve the controlling requirement. The targeted response is: Form a remediation sequence from observed baseline, known-good checkpoint, expected impact and verification steps rather than changing multiple controls at once. Scenario: A repair script changes routing, authentication and QoS in one batch so no engineer can attribute the recovery.

Distinguish loss of light or cabling/optic errors from configuration faults using interface and transceiver diagnostics before changing routing policy. This action instead applies to Physical link failure diagnostics. A Layer 1 fault should be isolated with optical and electrical evidence before troubleshooting Layer 3 protocols. It does not directly resolve the controlling requirement. The targeted response is: Form a remediation sequence from observed baseline, known-good checkpoint, expected impact and verification steps rather than changing multiple controls at once. Scenario: A repair script changes routing, authentication and QoS in one batch so no engineer can attribute the recovery.

Use per-hop VLAN and trunk inspection to locate an endpoint broadcast domain missing from the authorized path. This action instead applies to VLAN ID mismatch and trunk omission. An end station can show link up while its VLAN is missing or differently tagged on an upstream segment. It does not directly resolve the controlling requirement. The targeted response is: Choose modular switching when high-density interface growth, supervisor resilience and replaceable modules justify chassis architecture; choose fixed models only when they satisfy measured needs. Scenario: A campus engineer selects a high-density chassis without checking whether the rack can supply power and cooling.

Create a consistent VLAN ID, SVI subnet, gateway and routing-domain matrix avoiding overlaps and unintended spanning. This action instead applies to IP addressing and VLAN numbering plan. A clearly documented IP/VLAN plan avoids collision and prevents a VLAN label from standing in for an L3 policy. It does not directly resolve the controlling requirement. The targeted response is: Choose modular switching when high-density interface growth, supervisor resilience and replaceable modules justify chassis architecture; choose fixed models only when they satisfy measured needs. Scenario: A campus engineer selects a high-density chassis without checking whether the rack can supply power and cooling.

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: Choose modular switching when high-density interface growth, supervisor resilience and replaceable modules justify chassis architecture; choose fixed models only when they satisfy measured needs. Scenario: A campus engineer selects a high-density chassis without checking whether the rack can supply power and cooling.

Examine site topology, switch count, uplink capacity, failure domains and convergence requirements. These checks can help with Branch distribution and collapse-core topology selection, but they are not the most discriminating first evidence here. Examine: Check powered endpoints, PoE class, uplink optics, stack or VSX requirements, interfaces and supported software for candidate models. Scenario: A campus building receives a fixed-port access model but requires redundant uplinks and capacity for planned user growth.

Verify address reservations, VRF segmentation, DHCP scope consistency, inter-site connectivity and VLAN trunk maps. These checks can help with IP addressing and VLAN numbering plan, but they are not the most discriminating first evidence here. Examine: Check powered endpoints, PoE class, uplink optics, stack or VSX requirements, interfaces and supported software for candidate models. Scenario: A campus building receives a fixed-port access model but requires redundant uplinks and capacity for planned user growth.

Check active REST API version, authentication mode, target VRF, transaction response, desired diff and audit trail. These checks can help with REST API and configuration-tool integration boundaries, but they are not the most discriminating first evidence here. Examine: Check powered endpoints, PoE class, uplink optics, stack or VSX requirements, interfaces and supported software for candidate models. Scenario: A campus building receives a fixed-port access model but requires redundant uplinks and capacity for planned user growth.

Network measurements remain timely and accessible to authorized operators with no sensitive community string exposure. 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: Validate route selection, administrative distance or policy and equal-cost path behavior across backup uplinks. Together with: Compare installed routing table, OSPF or BGP candidate paths, forwarding next hops and configured preferences. Scenario: An engineer assumes BGP session count determines how many usable ECMP next hops appear in the FIB.

Integrate the network with approved Central monitoring and incident workflows using supported device enrollment, health data and role-scoped access. This step pertains to Aruba Central and switch telemetry integration but is not one of the two complementary decisions in this case. The required response and evidence are: Validate route selection, administrative distance or policy and equal-cost path behavior across backup uplinks. Together with: Compare installed routing table, OSPF or BGP candidate paths, forwarding next hops and configured preferences. Scenario: An engineer assumes BGP session count determines how many usable ECMP next hops appear in the FIB.

Inspect role download status, authentication result, role mapping, ACL application, device/platform support and enforcement counters. This step pertains to Dynamic segmentation downloadable roles policy but is not one of the two complementary decisions in this case. The required response and evidence are: Validate route selection, administrative distance or policy and equal-cost path behavior across backup uplinks. Together with: Compare installed routing table, OSPF or BGP candidate paths, forwarding next hops and configured preferences. Scenario: An engineer assumes BGP session count determines how many usable ECMP next hops appear in the FIB.

Check temperature sensors, fan speed alarms, power supply redundancy, PoE consumption and event history. These checks can help with Environmental and power health monitoring, but they are not the most discriminating first evidence here. Examine: Review model software release notes, platform feature matrix, hardware resource limits and transceiver compatibility. Scenario: A purchasing list uses optics that fit the cage mechanically but lack certification for the target hardware release.

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: Review model software release notes, platform feature matrix, hardware resource limits and transceiver compatibility. Scenario: A purchasing list uses optics that fit the cage mechanically but lack certification for the target hardware release.

Check link distance, OM grade or single-mode fiber, optical budget, part support and switch interface rate. These checks can help with Optical and copper media compatibility, but they are not the most discriminating first evidence here. Examine: Review model software release notes, platform feature matrix, hardware resource limits and transceiver compatibility. Scenario: A purchasing list uses optics that fit the cage mechanically but lack certification for the target hardware release.

Integrate the network with approved Central monitoring and incident workflows using supported device enrollment, health data and role-scoped access. This action instead applies to Aruba Central and switch telemetry integration. Monitoring integration does not automatically enforce remediation; event relevance and permitted access need validation. It does not directly resolve the controlling requirement. The targeted response is: Coordinate supported VSX peer and downstream MC-LAG connectivity with the core and access design and confirm peer synchronization boundaries. Scenario: A campus aggregation VSX pair loses peer keepalive and the team assumes the failure is invisible to downstream connectivity.

Configure EAP-based access authentication with correct RADIUS reachability, credentials, switch identity and port role behavior. This action instead applies to 802.1X and RADIUS port authentication. An access port can be physically up but blocked by authentication policy, distinct from VLAN or cabling failure. It does not directly resolve the controlling requirement. The targeted response is: Coordinate supported VSX peer and downstream MC-LAG connectivity with the core and access design and confirm peer synchronization boundaries. Scenario: A campus aggregation VSX pair loses peer keepalive and the team assumes the failure is invisible to downstream connectivity.

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: Coordinate supported VSX peer and downstream MC-LAG connectivity with the core and access design and confirm peer synchronization boundaries. Scenario: A campus aggregation VSX pair loses peer keepalive and the team assumes the failure is invisible to downstream connectivity.

Inspect physical alarms, optical budget, loopback results, error history, supported optics and redundant-path readiness. This step pertains to Optic and port fault replacement strategy but is not one of the two complementary decisions in this case. The required response and evidence are: Repair LACP member identity or negotiation mismatches on both peers rather than converting a redundant uplink into unmonitored standalone links. Together with: Inspect LAG IDs, LACP partner, interface speeds, VLAN modes and member operational state before adjustment. Scenario: An administrator proposes turning off LACP on one peer only to make a failed member green.

Restore an OSPF adjacency or missing advertisement using targeted parameter, area or redistribution corrections with route verification. This step pertains to OSPF route recovery with controlled scope but is not one of the two complementary decisions in this case. The required response and evidence are: Repair LACP member identity or negotiation mismatches on both peers rather than converting a redundant uplink into unmonitored standalone links. Together with: Inspect LAG IDs, LACP partner, interface speeds, VLAN modes and member operational state before adjustment. Scenario: An administrator proposes turning off LACP on one peer only to make a failed member green.

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: Repair LACP member identity or negotiation mismatches on both peers rather than converting a redundant uplink into unmonitored standalone links. Together with: Inspect LAG IDs, LACP partner, interface speeds, VLAN modes and member operational state before adjustment. Scenario: An administrator proposes turning off LACP on one peer only to make a failed member green.

Compare signed requirement matrix, design revision, target firmware, selected feature and test result IDs. These checks can help with Requirements-to-configuration traceability matrix, but they are not the most discriminating first evidence here. Examine: Compare installation photos, running and startup configs, topology neighbors, asset inventory and exception log. Scenario: An uplink is moved to an alternative interface during cutover and monitoring still tracks the original port.

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 installation photos, running and startup configs, topology neighbors, asset inventory and exception log. Scenario: An uplink is moved to an alternative interface during cutover and monitoring still tracks the original port.

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: Compare installation photos, running and startup configs, topology neighbors, asset inventory and exception log. Scenario: An uplink is moved to an alternative interface during cutover and monitoring still tracks the original port.

Inspect allowed VLAN lists, IP plans, gateway addresses, routes and dependency owners at each change stage. This step pertains to Dependency ordering for VLAN and routed cutovers but is not one of the two complementary decisions in this case. The required response and evidence are: Size distributed or collapsed core switching based on site scale, resilient paths, routed boundaries and maintenance windows. Together with: Examine site topology, switch count, uplink capacity, failure domains and convergence requirements. Scenario: A multi-building campus wants a single distribution switch and overlooks the failure domain it creates.

Repeated runs converge on the intended configuration without deleting unrelated settings and produce verifiable audit evidence. This step pertains to Idempotent REST updates and config difference verification but is not one of the two complementary decisions in this case. The required response and evidence are: Size distributed or collapsed core switching based on site scale, resilient paths, routed boundaries and maintenance windows. Together with: Examine site topology, switch count, uplink capacity, failure domains and convergence requirements. Scenario: A multi-building campus wants a single distribution switch and overlooks the failure domain it creates.

Prepare rack units, air flow, dual power paths, cable labeling and OOB management before powering the switching hardware. 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: Size distributed or collapsed core switching based on site scale, resilient paths, routed boundaries and maintenance windows. Together with: Examine site topology, switch count, uplink capacity, failure domains and convergence requirements. Scenario: A multi-building campus wants a single distribution switch and overlooks the failure domain it creates.

Monitor authentication success ratios, rejected sessions, policy role assignment and known exception endpoints by switch/site. This step pertains to Client authentication and port-role operational reports 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: A security ACL change is blamed for an outage that logs show started before the change.

Inspect local/remote port IDs, system descriptions, LLDP freshness, link MACs and expected cable map. This step pertains to LLDP topology and neighbor mapping 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: A security ACL change is blamed for an outage that logs show started before the change.

The required application path is restored only between approved zones, leaving unauthorized traffic denied. This step pertains to VRF and route-leak correction 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: A security ACL change is blamed for an outage that logs show started before the change.