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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.

Apply supported access-edge protection such as DHCP snooping, ARP inspection or MAC controls where appropriate and validate trust boundaries. This action instead applies to Port security and DHCP/ARP spoofing defenses. Trusting all access ports undermines spoofing defenses; setting uplink trust without verifying bindings can also disrupt service. 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: A building sensor cannot run EAP but operations wants it on a full-trust user VLAN through unreviewed MAB.

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: Use approved MAC authentication or critical-role treatment for devices lacking supplicants with explicit limited privileges and monitoring. Scenario: A building sensor cannot run EAP but operations wants it on a full-trust user VLAN through unreviewed MAB.

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: Use approved MAC authentication or critical-role treatment for devices lacking supplicants with explicit limited privileges and monitoring. Scenario: A building sensor cannot run EAP but operations wants it on a full-trust user VLAN through unreviewed MAB.

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: Use IGMP snooping and a suitable querier or routed multicast context to constrain multicast replication to interested ports. Together with: Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. Scenario: Receivers join an audio multicast group but the switch ages memberships with no active querier.

Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. This step pertains to PIM and multicast routed-path validation but is not one of the two complementary decisions in this case. The required response and evidence are: Use IGMP snooping and a suitable querier or routed multicast context to constrain multicast replication to interested ports. Together with: Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. Scenario: Receivers join an audio multicast group but the switch ages memberships with no active querier.

Maintenance produces attributable acceptance evidence and business users receive accurate impact updates. This step pertains to Scheduled change window and impact communication but is not one of the two complementary decisions in this case. The required response and evidence are: Use IGMP snooping and a suitable querier or routed multicast context to constrain multicast replication to interested ports. Together with: Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. Scenario: Receivers join an audio multicast group but the switch ages memberships with no active querier.

Trace a host's local IP, mask, gateway and ARP resolution before attributing reachability failure to routing protocols. This action instead applies to IP addressing subnet and gateway mismatch. Incorrect subnet or default gateway settings can break connectivity even while VLAN forwarding remains healthy. It does not directly resolve the controlling requirement. The targeted response is: Restore only the approved missing VLAN tags and native VLAN relationship at both ends of an uplink, then test representative hosts. Scenario: A distribution trunk omitted one finance VLAN after a template deployment and finance desktops cannot reach their gateway.

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: Restore only the approved missing VLAN tags and native VLAN relationship at both ends of an uplink, then test representative hosts. Scenario: A distribution trunk omitted one finance VLAN after a template deployment and finance desktops cannot reach their gateway.

Attribute application loss to the actual congested egress queue and traffic class rather than only interface-level packet drops. This action instead applies to QoS queue drop root cause under congestion. Interface error counters can remain zero while egress queues discard packets during oversubscription. It does not directly resolve the controlling requirement. The targeted response is: Restore only the approved missing VLAN tags and native VLAN relationship at both ends of an uplink, then test representative hosts. Scenario: A distribution trunk omitted one finance VLAN after a template deployment and finance desktops cannot reach their gateway.

The updated switch boots a supported image and retains routing, authentication and management services with tested rollback readiness. This result is associated with Firmware maintenance compatibility and image fallback; it does not demonstrate the requested network behavior. The relevant acceptance test is: Approved configuration revisions can be recovered during a failed cutover with an attributable operator and documented restoration outcome. Scenario: A branch recovery drill discovers configuration archives are stored on the same failed switch being replaced.

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: Approved configuration revisions can be recovered during a failed cutover with an attributable operator and documented restoration outcome. Scenario: A branch recovery drill discovers configuration archives are stored on the same failed switch being replaced.

Unauthorized local deviations are identified and remediated without overwriting legitimate site-specific variables. This result is associated with Centralized configuration drift audit; it does not demonstrate the requested network behavior. The relevant acceptance test is: Approved configuration revisions can be recovered during a failed cutover with an attributable operator and documented restoration outcome. Scenario: A branch recovery drill discovers configuration archives are stored on the same failed switch being replaced.

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: Calculate access ports, PoE classes and spare uplink capacity from endpoint inventory and growth rather than ordering by current occupied ports alone. Together with: Review endpoint counts by class, anticipated additions, PoE budgets and uplink utilization peaks. Scenario: A wiring closet has enough Ethernet ports but high-power access points would exhaust its PoE supply.

The specific VSX fault domain is identified with safe recovery steps, not a blind dual-reboot. This step pertains to VSX peer and keepalive failure symptom isolation but is not one of the two complementary decisions in this case. The required response and evidence are: Calculate access ports, PoE classes and spare uplink capacity from endpoint inventory and growth rather than ordering by current occupied ports alone. Together with: Review endpoint counts by class, anticipated additions, PoE budgets and uplink utilization peaks. Scenario: A wiring closet has enough Ethernet ports but high-power access points would exhaust its PoE supply.

Compare installation photos, running and startup configs, topology neighbors, asset inventory and exception log. This step pertains to Change documentation and as-built reconciliation but is not one of the two complementary decisions in this case. The required response and evidence are: Calculate access ports, PoE classes and spare uplink capacity from endpoint inventory and growth rather than ordering by current occupied ports alone. Together with: Review endpoint counts by class, anticipated additions, PoE budgets and uplink utilization peaks. Scenario: A wiring closet has enough Ethernet ports but high-power access points would exhaust its PoE supply.

A failed pilot is isolated to its site, while later sites receive corrected runbooks and signed approval. This result is associated with Multisite change phasing and blast radius reduction; it does not demonstrate the requested network behavior. The relevant acceptance test is: A reproducible impairment is separated from a monitoring artifact with corrected alert thresholds or source data. Scenario: A switch telemetry agent stops collecting for ten minutes and graphs display a misleading zero throughput dip.

The retry source and server bottleneck are isolated with sessions stabilizing and intended access policy retained. This result is associated with Authentication storms and endpoint retry load; it does not demonstrate the requested network behavior. The relevant acceptance test is: A reproducible impairment is separated from a monitoring artifact with corrected alert thresholds or source data. Scenario: A switch telemetry agent stops collecting for ten minutes and graphs display a misleading zero throughput dip.

The affected class receives measured queue improvement under load with unrelated classes remaining usable. This result is associated with Packet buffer pressure and head-of-line impact; it does not demonstrate the requested network behavior. The relevant acceptance test is: A reproducible impairment is separated from a monitoring artifact with corrected alert thresholds or source data. Scenario: A switch telemetry agent stops collecting for ten minutes and graphs display a misleading zero throughput dip.

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: Validate port maps, patching, labeling and redundant path diversity as part of physical switch commissioning. Scenario: A dual-uplink access switch inadvertently connects both fibers to the same distribution chassis.

Install supported SFP or QSFP transceivers with matching fiber and validate interface hardware status before making logical protocol changes. This action instead applies to Optic insertion and physical layer preflight. Optical mismatch or contamination should be isolated at Layer 1 before changing VLAN or routing state. It does not directly resolve the controlling requirement. The targeted response is: Validate port maps, patching, labeling and redundant path diversity as part of physical switch commissioning. Scenario: A dual-uplink access switch inadvertently connects both fibers to the same distribution chassis.

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: Validate port maps, patching, labeling and redundant path diversity as part of physical switch commissioning. Scenario: A dual-uplink access switch inadvertently connects both fibers to the same distribution chassis.

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: Configure BGP neighbor identity, AS relationships, reachability and import/export controls, then validate actual installed routes. Scenario: Two BGP peers show Established but return traffic follows a stale next-hop route.

Use separate VRFs for management, corporate, and guest routing where specified, with explicit approved inter-VRF connectivity. This action instead applies to VRF isolation and controlled route leaking. VRFs separate routing tables, but they do not replace security policy on deliberately interconnected services. It does not directly resolve the controlling requirement. The targeted response is: Configure BGP neighbor identity, AS relationships, reachability and import/export controls, then validate actual installed routes. Scenario: Two BGP peers show Established but return traffic follows a stale next-hop route.

Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. This action instead applies to Access VLAN and trunk allowed-list design. Native or untagged VLAN behavior and tagged VLAN allowance must agree across both ends of a trunk. It does not directly resolve the controlling requirement. The targeted response is: Configure BGP neighbor identity, AS relationships, reachability and import/export controls, then validate actual installed routes. Scenario: Two BGP peers show Established but return traffic follows a stale next-hop route.

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 LAG IDs, LACP partner, interface speeds, VLAN modes and member operational state before adjustment. Scenario: A maintenance script switches a LAG from active negotiation to incompatible static mode.

Inspect queue backlog, buffer thresholds, drop reasons, burst traffic composition and port egress rates. These checks can help with Packet buffer pressure and head-of-line impact, but they are not the most discriminating first evidence here. Examine: Inspect LAG IDs, LACP partner, interface speeds, VLAN modes and member operational state before adjustment. Scenario: A maintenance script switches a LAG from active negotiation to incompatible static mode.

Check port mode, VLAN membership, tagged/untagged lists, allowed trunk VLANs and MAC learning per VLAN. These checks can help with VLAN ID mismatch and trunk omission, but they are not the most discriminating first evidence here. Examine: Inspect LAG IDs, LACP partner, interface speeds, VLAN modes and member operational state before adjustment. Scenario: A maintenance script switches a LAG from active negotiation to incompatible static mode.

Create LAG groups with matching LACP negotiation, physical rates, VLAN configuration and supported hash behavior. This step pertains to LACP link aggregation member consistency but is not one of the two complementary decisions in this case. The required response and evidence are: Configure the appropriate spanning tree mode and root placement for the Layer 2 topology, then verify alternate-port behavior. Together with: Inspect root bridge ID, port roles, path cost, MST region consistency and topology change counters. Scenario: A contractor creates a patch-cord loop and packet flooding rises despite a topology documented as loop-free.

New templates apply correctly to pilot devices and promote only after peer, VLAN and role acceptance gates pass. This step pertains to Config template test and promotion pipeline but is not one of the two complementary decisions in this case. The required response and evidence are: Configure the appropriate spanning tree mode and root placement for the Layer 2 topology, then verify alternate-port behavior. Together with: Inspect root bridge ID, port roles, path cost, MST region consistency and topology change counters. Scenario: A contractor creates a patch-cord loop and packet flooding rises despite a topology documented as loop-free.

Inspect stack topology, member state, link health, firmware compatibility, commander role and split detection. 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: Configure the appropriate spanning tree mode and root placement for the Layer 2 topology, then verify alternate-port behavior. Together with: Inspect root bridge ID, port roles, path cost, MST region consistency and topology change counters. Scenario: A contractor creates a patch-cord loop and packet flooding rises despite a topology documented as loop-free.