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Inspect PHY speed, autonegotiation, FCS/CRC, runts, cable test and optic telemetry. This step pertains to Duplex speed and physical error performance analysis but is not one of the two complementary decisions in this case. The required response and evidence are: Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. Together with: Review OSPF neighbor state, area, timers, MTU, authentication, interface network type and installed routes. Scenario: An OSPF uplink is configured in the wrong area and continuously fails neighbor negotiation.

A failed member can be recovered or replaced without assuming an isolated member is an independent operational core. This step pertains to VSF stack topology and member replacement but is not one of the two complementary decisions in this case. The required response and evidence are: Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. Together with: Review OSPF neighbor state, area, timers, MTU, authentication, interface network type and installed routes. Scenario: An OSPF uplink is configured in the wrong area and continuously fails neighbor negotiation.

Use high-frequency interface and queue evidence to distinguish short microbursts from sustained bandwidth saturation. This step pertains to Microburst and oversubscription performance analysis but is not one of the two complementary decisions in this case. The required response and evidence are: Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. Together with: Review OSPF neighbor state, area, timers, MTU, authentication, interface network type and installed routes. Scenario: An OSPF uplink is configured in the wrong area and continuously fails neighbor negotiation.

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: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.

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: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.

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: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.

Check release notes, affected features, config backup and approved rollback before applying AOS-CX software changes to address a suspected defect. This action instead applies to Validation-first firmware defect remediation. Firmware upgrades can resolve known defects but should follow evidence and a recoverable maintenance plan. 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 branch operator changes a VLAN locally and Central template policy restores it unexpectedly on next synchronization.

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: Compare deployed AOS-CX configurations against approved Aruba Central templates or version-controlled intended state and record exceptions. Scenario: A branch operator changes a VLAN locally and Central template policy restores it unexpectedly on next synchronization.

Use supported Network Analytics Engine monitors and rules to correlate switch database state with alerts and historical graphs. This action instead applies to NAE agent and threshold monitoring. NAE rules evaluate monitored data and can trigger alerts; a script must be enabled and scoped, not merely uploaded. 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 branch operator changes a VLAN locally and Central template policy restores it unexpectedly on next synchronization.

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: Inspect boot logs, DHCP options, name resolution, management addressing, port VLAN, service accessibility and registration state. Scenario: A replacement campus switch obtains a DHCP lease but does not receive usable provisioning instructions.

Inspect active configuration context, interface name, running configuration, link state, peer capabilities and software help. These checks can help with AOS-CX interface configuration hierarchy, but they are not the most discriminating first evidence here. Examine: Inspect boot logs, DHCP options, name resolution, management addressing, port VLAN, service accessibility and registration state. Scenario: A replacement campus switch obtains a DHCP lease but does not receive usable provisioning instructions.

Inspect stack topology, member state, link health, firmware compatibility, commander role and split detection. These checks can help with VSF stack topology and member replacement, but they are not the most discriminating first evidence here. Examine: Inspect boot logs, DHCP options, name resolution, management addressing, port VLAN, service accessibility and registration state. Scenario: A replacement campus switch obtains a DHCP lease but does not receive usable provisioning instructions.

Inspect server status, shared secret, policy decision, client identity, session logs and effective role. These checks can help with Authentication and RADIUS remediation discipline, 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: A storage application briefly transmits line-rate bursts through a lower-rate uplink and buffers overflow.

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 peak counters, buffers, burst duration, port rates, packet loss and affected application flows. Scenario: A storage application briefly transmits line-rate bursts through a lower-rate uplink and buffers overflow.

Inspect VSX role and peer state, keepalive reachability, ISL counters, member sync status and downstream LAG health. These checks can help with VSX health telemetry and failover readiness, 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: A storage application briefly transmits line-rate bursts through a lower-rate uplink and buffers overflow.

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 ISL status, VSX keepalive, MC-LAG members, VLAN consistency, active gateway and split-brain protections. Scenario: A campus aggregation VSX pair loses peer keepalive and the team assumes the failure is invisible to downstream connectivity.

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: Inspect ISL status, VSX keepalive, MC-LAG members, VLAN consistency, active gateway and split-brain protections. Scenario: A campus aggregation VSX pair loses peer keepalive and the team assumes the failure is invisible to downstream connectivity.

Inspect NAD records, authentication source, RADIUS VSAs, role mapping, certificate path and endpoint policy. These checks can help with ClearPass or identity-service policy integration, but they are not the most discriminating first evidence here. Examine: Inspect ISL status, VSX keepalive, MC-LAG members, VLAN consistency, active gateway and split-brain protections. Scenario: A campus aggregation VSX pair loses peer keepalive and the team assumes the failure is invisible to downstream connectivity.

The failing service recovers after a traceable bounded change and its original healthy behavior remains intact. This result is associated with Minimal-change rollback and restoration plan; it does not demonstrate the requested network behavior. The relevant acceptance test is: Downstream aggregation survives a member loss without unexpected isolation or loops, consistent with documented VSX behavior. Scenario: A topology migrates to VSX but upstream routing remains designed as though the pair were one single control plane.

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: Downstream aggregation survives a member loss without unexpected isolation or loops, consistent with documented VSX behavior. Scenario: A topology migrates to VSX but upstream routing remains designed as though the pair were one single control plane.

Successful authentication produces the intended dynamically assigned access controls with reproducible audit evidence. This result is associated with ClearPass or identity-service policy integration; it does not demonstrate the requested network behavior. The relevant acceptance test is: Downstream aggregation survives a member loss without unexpected isolation or loops, consistent with documented VSX behavior. Scenario: A topology migrates to VSX but upstream routing remains designed as though the pair were one single control plane.

Coordinate supported VSX peer and downstream MC-LAG connectivity with the core and access design and confirm peer synchronization boundaries. This action instead applies to VSX and aggregation integration verification. VSX peers maintain distinct control planes; inter-switch link and keepalive health require direct monitoring. It does not directly resolve the controlling requirement. The targeted response is: Distinguish missing DHCP broadcasts, blocked offers and relay misconfiguration with trust and binding evidence. Scenario: A guest DHCP relay points to a retired server while the local access VLAN remains up.

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: Distinguish missing DHCP broadcasts, blocked offers and relay misconfiguration with trust and binding evidence. Scenario: A guest DHCP relay points to a retired server while the local access VLAN remains up.

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: Distinguish missing DHCP broadcasts, blocked offers and relay misconfiguration with trust and binding evidence. Scenario: A guest DHCP relay points to a retired server while the local access VLAN remains up.

Determine whether an access stack, multi-chassis VSX pair or independent routed switch pair best satisfies topology and failure-control objectives. This action instead applies to Resiliency capability evaluation VSX and VSF. VSF presents a logical stack while VSX supports peer coordination with independent control planes on appropriate platforms. It does not directly resolve the controlling requirement. The targeted response is: Map HPE Aruba CX access and aggregation switch families to port count, PoE, uplink, redundancy and scale requirements rather than treating every chassis as interchangeable. Scenario: A campus building receives a fixed-port access model but requires redundant uplinks and capacity for planned user growth.

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: Map HPE Aruba CX access and aggregation switch families to port count, PoE, uplink, redundancy and scale requirements rather than treating every chassis as interchangeable. Scenario: A campus building receives a fixed-port access model but requires redundant uplinks and capacity for planned user growth.

Differentiate RADIUS latency and repeated endpoint authentication churn from application packet loss or physical interface faults. This action instead applies to Authentication storms and endpoint retry load. Authentication storms can degrade perceived access and control-plane performance despite normal link LEDs. It does not directly resolve the controlling requirement. The targeted response is: Map HPE Aruba CX access and aggregation switch families to port count, PoE, uplink, redundancy and scale requirements rather than treating every chassis as interchangeable. Scenario: A campus building receives a fixed-port access model but requires redundant uplinks and capacity for planned user growth.

The switch appears under the approved management tenant with authorized functions and documented ongoing entitlement. This result is associated with Campus management and licensing boundaries; it does not demonstrate the requested network behavior. The relevant acceptance test is: The installed equipment maintains acceptable temperature and power redundancy, with recoverable console access. Scenario: A campus core pair is powered from the same PDU and advertised as resilient to power failure.

Every required capability is supported on the selected hardware and validated release, with documented exceptions for unsupported functions. This result is associated with AOS-CX feature and software compatibility matrix; it does not demonstrate the requested network behavior. The relevant acceptance test is: The installed equipment maintains acceptable temperature and power redundancy, with recoverable console access. Scenario: A campus core pair is powered from the same PDU and advertised as resilient to power failure.

Qualified members forward as one logical uplink while an incompatible member stays out without a loop. This result is associated with LACP link aggregation member consistency; it does not demonstrate the requested network behavior. The relevant acceptance test is: The installed equipment maintains acceptable temperature and power redundancy, with recoverable console access. Scenario: A campus core pair is powered from the same PDU and advertised as resilient to power failure.

Review supported VSF or VSX platforms, physical interconnects, control-plane independence, role design and failover requirements. These checks can help with Resiliency capability evaluation VSX and VSF, but they are not the most discriminating first evidence here. Examine: Inspect identity server reachability, time synchronization, EAP settings, downloadable role support, exceptions and emergency access. Scenario: A printer fleet lacks EAP supplicants but the deployment plan has no governed MAB fallback.

Check root bridge ID, port role/state, BPDU activity, topology change count and MAC instability. These checks can help with STP blocking and topology-loop recognition, but they are not the most discriminating first evidence here. Examine: Inspect identity server reachability, time synchronization, EAP settings, downloadable role support, exceptions and emergency access. Scenario: A printer fleet lacks EAP supplicants but the deployment plan has no governed MAB fallback.

Inspect allowed VLAN lists, IP plans, gateway addresses, routes and dependency owners at each change stage. These checks can help with Dependency ordering for VLAN and routed cutovers, but they are not the most discriminating first evidence here. Examine: Inspect identity server reachability, time synchronization, EAP settings, downloadable role support, exceptions and emergency access. Scenario: A printer fleet lacks EAP supplicants but the deployment plan has no governed MAB fallback.