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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.

The expected endpoint VLAN reaches the correct gateway without inadvertently enabling unrelated VLANs. This result is associated with VLAN ID mismatch and trunk omission; it does not demonstrate the requested network behavior. The relevant acceptance test is: Authorized users reconnect in the correct role, while negative test identities remain blocked or restricted. Scenario: An engineer suggests disabling every port's 802.1X policy while investigating one legacy printer's failure.

The intended aggregate forms and remains stable under a member unplug test. This result is associated with LACP peer repair without unsafe bypass; it does not demonstrate the requested network behavior. The relevant acceptance test is: Authorized users reconnect in the correct role, while negative test identities remain blocked or restricted. Scenario: An engineer suggests disabling every port's 802.1X policy while investigating one legacy printer's failure.

A tested change survives the intended restart while an approved rollback restores the previous known-good configuration. This result is associated with AOS-CX configuration save and checkpoint workflow; it does not demonstrate the requested network behavior. The relevant acceptance test is: Authorized users reconnect in the correct role, while negative test identities remain blocked or restricted. Scenario: An engineer suggests disabling every port's 802.1X policy while investigating one legacy printer's failure.

Review Central group type, effective configuration, variable bindings, supported template syntax and local override restrictions. This step pertains to Central UI group versus template configuration scope but is not one of the two complementary decisions in this case. The required response and evidence are: Prepare DHCP, provisioning endpoint reachability, management VLAN or VRF and initial credentials for safe zero-touch provisioning. Together with: Inspect boot logs, DHCP options, name resolution, management addressing, port VLAN, service accessibility and registration state. Scenario: A factory-reset device arrives on a network whose management VLAN cannot reach cloud onboarding services.

Onboard a supported AOS-CX switch to the approved Aruba Central tenant, inventory and group with valid subscription and reachability before pushing managed configuration. This step pertains to Aruba Central inventory onboarding and assignment but is not one of the two complementary decisions in this case. The required response and evidence are: Prepare DHCP, provisioning endpoint reachability, management VLAN or VRF and initial credentials for safe zero-touch provisioning. Together with: Inspect boot logs, DHCP options, name resolution, management addressing, port VLAN, service accessibility and registration state. Scenario: A factory-reset device arrives on a network whose management VLAN cannot reach cloud onboarding services.

The congested class and marking mismatch are documented with correlated performance impact. This step pertains to QoS queue drop root cause under congestion but is not one of the two complementary decisions in this case. The required response and evidence are: Prepare DHCP, provisioning endpoint reachability, management VLAN or VRF and initial credentials for safe zero-touch provisioning. Together with: Inspect boot logs, DHCP options, name resolution, management addressing, port VLAN, service accessibility and registration state. Scenario: A factory-reset device arrives on a network whose management VLAN cannot reach cloud onboarding services.

Examine client Discover/Offer exchanges, snooping trusted ports, VLAN interface, relay server reachability and binding table. This step pertains to DHCP snooping and client boot failure identification but is not one of the two complementary decisions in this case. The required response and evidence are: Distinguish loss of light or cabling/optic errors from configuration faults using interface and transceiver diagnostics before changing routing policy. Together with: Inspect interface admin/oper state, optic transmit/receive power, CRC/FCS counters, negotiated speed and neighbor light levels. Scenario: A fiber uplink remains down after a switch replacement even though both interfaces are enabled.

Identify LAG members that fail to bundle due to system ID, LACP mode, peer-group, speed or VLAN incompatibility. This step pertains to LACP aggregation mismatch investigation but is not one of the two complementary decisions in this case. The required response and evidence are: Distinguish loss of light or cabling/optic errors from configuration faults using interface and transceiver diagnostics before changing routing policy. Together with: Inspect interface admin/oper state, optic transmit/receive power, CRC/FCS counters, negotiated speed and neighbor light levels. Scenario: A fiber uplink remains down after a switch replacement even though both interfaces are enabled.

Routes appear only in intended tables and traffic shifts correctly after failure with no prolonged black hole. 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: Distinguish loss of light or cabling/optic errors from configuration faults using interface and transceiver diagnostics before changing routing policy. Together with: Inspect interface admin/oper state, optic transmit/receive power, CRC/FCS counters, negotiated speed and neighbor light levels. Scenario: A fiber uplink remains down after a switch replacement even though both interfaces are enabled.

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: Interpret VSX health, keepalive, ISL, synchronization and active-gateway status before planning peer maintenance. Scenario: A maintenance window is approved although the keepalive path is down and split-state risk is unresolved.

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: Interpret VSX health, keepalive, ISL, synchronization and active-gateway status before planning peer maintenance. Scenario: A maintenance window is approved although the keepalive path is down and split-state risk is unresolved.

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: Interpret VSX health, keepalive, ISL, synchronization and active-gateway status before planning peer maintenance. Scenario: A maintenance window is approved although the keepalive path is down and split-state risk is unresolved.

The deployed switch supports expected expansion without immediate port exhaustion, power shedding or oversubscribed uplinks. This step pertains to Port density and growth headroom but is not one of the two complementary decisions in this case. The required response and evidence are: Compare negotiated link speed and error counters to rule out physical bottlenecks before altering QoS or routing. Together with: Inspect PHY speed, autonegotiation, FCS/CRC, runts, cable test and optic telemetry. Scenario: A user complains of low throughput but the host NIC and switch disagree on negotiation expectations.

Check root bridge ID, port role/state, BPDU activity, topology change count and MAC instability. This step pertains to STP blocking and topology-loop recognition but is not one of the two complementary decisions in this case. The required response and evidence are: Compare negotiated link speed and error counters to rule out physical bottlenecks before altering QoS or routing. Together with: Inspect PHY speed, autonegotiation, FCS/CRC, runts, cable test and optic telemetry. Scenario: A user complains of low throughput but the host NIC and switch disagree on negotiation expectations.

Repair LACP member identity or negotiation mismatches on both peers rather than converting a redundant uplink into unmonitored standalone links. This step pertains to LACP peer repair without unsafe bypass but is not one of the two complementary decisions in this case. The required response and evidence are: Compare negotiated link speed and error counters to rule out physical bottlenecks before altering QoS or routing. Together with: Inspect PHY speed, autonegotiation, FCS/CRC, runts, cable test and optic telemetry. Scenario: A user complains of low throughput but the host NIC and switch disagree on negotiation expectations.

The affected flow is traced through the correct routing table with no accidental cross-VRF access. This step pertains to VRF route-table mismatch investigation but is not one of the two complementary decisions in this case. The required response and evidence are: Implement a supported VSF topology with consistent member identities, stack links and role expectations, and validate member failover. Together with: Inspect stack topology, member state, link health, firmware compatibility, commander role and split detection. Scenario: An access stack uses one daisy-chain link and its owner expects ring resilience despite a missing return connection.

Apply edge-port and BPDU protection to endpoint-facing ports, preserving expected behavior on real interswitch links. This step pertains to BPDU guard and edge port hardening but is not one of the two complementary decisions in this case. The required response and evidence are: Implement a supported VSF topology with consistent member identities, stack links and role expectations, and validate member failover. Together with: Inspect stack topology, member state, link health, firmware compatibility, commander role and split detection. Scenario: An access stack uses one daisy-chain link and its owner expects ring resilience despite a missing return connection.

Inspect TCP reachability, neighbor remote AS, update source, next hop, accepted/advertised prefixes and policy counters. This step pertains to BGP peer establishment and route policy validation but is not one of the two complementary decisions in this case. The required response and evidence are: Implement a supported VSF topology with consistent member identities, stack links and role expectations, and validate member failover. Together with: Inspect stack topology, member state, link health, firmware compatibility, commander role and split detection. Scenario: An access stack uses one daisy-chain link and its owner expects ring resilience despite a missing return connection.

A redundant path remains correctly controlled while a mistaken loop or root shift is isolated. This step pertains to STP blocking and topology-loop recognition but is not one of the two complementary decisions in this case. The required response and evidence are: Configure BGP neighbor identity, AS relationships, reachability and import/export controls, then validate actual installed routes. Together with: Inspect TCP reachability, neighbor remote AS, update source, next hop, accepted/advertised prefixes and policy counters. Scenario: A WAN edge BGP session stays idle because the configured remote AS does not match the carrier.

Review Central group type, effective configuration, variable bindings, supported template syntax and local override restrictions. This step pertains to Central UI group versus template configuration scope but is not one of the two complementary decisions in this case. The required response and evidence are: Configure BGP neighbor identity, AS relationships, reachability and import/export controls, then validate actual installed routes. Together with: Inspect TCP reachability, neighbor remote AS, update source, next hop, accepted/advertised prefixes and policy counters. Scenario: A WAN edge BGP session stays idle because the configured remote AS does not match the carrier.

Use separate VRFs for management, corporate, and guest routing where specified, with explicit approved inter-VRF connectivity. This step pertains to VRF isolation and controlled route leaking but is not one of the two complementary decisions in this case. The required response and evidence are: Configure BGP neighbor identity, AS relationships, reachability and import/export controls, then validate actual installed routes. Together with: Inspect TCP reachability, neighbor remote AS, update source, next hop, accepted/advertised prefixes and policy counters. Scenario: A WAN edge BGP session stays idle because the configured remote AS does not match the carrier.

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: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Scenario: A remote video receiver receives no stream after a routing change breaks PIM's reverse-path check.

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: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Scenario: A remote video receiver receives no stream after a routing change breaks PIM's reverse-path check.

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: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Scenario: A remote video receiver receives no stream after a routing change breaks PIM's reverse-path check.

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 polling interval, baseline trend, telemetry collection gaps, alert configuration and correlated switch counters. Scenario: An operations report compares capacity before and after a firmware upgrade despite changed counter collection cadence.

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 polling interval, baseline trend, telemetry collection gaps, alert configuration and correlated switch counters. Scenario: An operations report compares capacity before and after a firmware upgrade despite changed counter collection cadence.

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 polling interval, baseline trend, telemetry collection gaps, alert configuration and correlated switch counters. Scenario: An operations report compares capacity before and after a firmware upgrade despite changed counter collection cadence.

Recover a failed AOS-CX switch with supported image, saved configuration, verified physical inventory and secure credential restoration. This action instead applies to Backup restoration and replacement switch workflow. Restoring a file to different hardware may require port and image adaptations; backup bytes alone do not prove service recovery. It does not directly resolve the controlling requirement. The targeted response is: Archive switch configs with encryption, retention and least-privilege access while avoiding uncontrolled exposure of shared credentials or tokens. Scenario: A branch backup upload uses a plaintext file share accessible by all employees.

Compare deployed AOS-CX configurations against approved Aruba Central templates or version-controlled intended state and record exceptions. This action instead applies to Centralized configuration drift audit. A device can be online in a management console while local configuration has drifted from the governed baseline. It does not directly resolve the controlling requirement. The targeted response is: Archive switch configs with encryption, retention and least-privilege access while avoiding uncontrolled exposure of shared credentials or tokens. Scenario: A branch backup upload uses a plaintext file share accessible by all employees.

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: Archive switch configs with encryption, retention and least-privilege access while avoiding uncontrolled exposure of shared credentials or tokens. Scenario: A branch backup upload uses a plaintext file share accessible by all employees.