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Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. This step pertains to OSPF neighbor and route missing root cause but is not one of the two complementary decisions in this case. The required response and evidence are: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Together with: Inspect multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: A large multicast application saturates office uplinks although only a subset of users subscribed.

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: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Together with: Inspect multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: A large multicast application saturates office uplinks although only a subset of users subscribed.

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: Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. Together with: Inspect multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: A large multicast application saturates office uplinks although only a subset of users subscribed.

Apply supported downloadable user roles or dynamic segmentation so authenticated client classes receive consistent least-privilege network access. 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: Apply supported access-edge protection such as DHCP snooping, ARP inspection or MAC controls where appropriate and validate trust boundaries. Together with: Inspect authorized DHCP server ports, binding tables, protected VLANs, ARP counters and switch feature support. Scenario: A DHCP snooping rollout blocks authorized client leases because its only relay/uplink port was not trusted.

Pilot endpoints retain expected access as the path moves to the new switches and routing boundaries. 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: Apply supported access-edge protection such as DHCP snooping, ARP inspection or MAC controls where appropriate and validate trust boundaries. Together with: Inspect authorized DHCP server ports, binding tables, protected VLANs, ARP counters and switch feature support. Scenario: A DHCP snooping rollout blocks authorized client leases because its only relay/uplink port was not trusted.

Check endpoint identity, allowed MAC profiles, primary 802.1X attempts, fallback order, authentication timeout and role policy. 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: Apply supported access-edge protection such as DHCP snooping, ARP inspection or MAC controls where appropriate and validate trust boundaries. Together with: Inspect authorized DHCP server ports, binding tables, protected VLANs, ARP counters and switch feature support. Scenario: A DHCP snooping rollout blocks authorized client leases because its only relay/uplink port was not trusted.

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: Compare serials, firmware, management tenant, location, replacement spares, support expiration and asset owner. Scenario: A regional network team cannot obtain timely replacement because the installed switch serial is absent from its asset register.

Inspect replacement model compatibility, firmware, backup checksum, device identity, port map and management integration. These checks can help with Backup restoration and replacement switch workflow, but they are not the most discriminating first evidence here. Examine: Compare serials, firmware, management tenant, location, replacement spares, support expiration and asset owner. Scenario: A regional network team cannot obtain timely replacement because the installed switch serial is absent from its asset register.

Inspect checkpoint inventory, startup/running diff, saved exports, backup location, device-specific recovery instructions and access permissions. These checks can help with Configuration checkpoint and rollback retention, but they are not the most discriminating first evidence here. Examine: Compare serials, firmware, management tenant, location, replacement spares, support expiration and asset owner. Scenario: A regional network team cannot obtain timely replacement because the installed switch serial is absent from its asset register.

Check VLAN active members, SVI IP prefix, routing state, VRF membership, connected routes and ARP/ND entries. These checks can help with SVI and routed interface gateway configuration, 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: An NAE or automation script runs at an excessive rate and appears in the same window as control-plane delays.

Examine client Discover/Offer exchanges, snooping trusted ports, VLAN interface, relay server reachability and binding table. These checks can help with DHCP snooping and client boot failure identification, 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: An NAE or automation script runs at an excessive rate and appears in the same window as control-plane delays.

Inspect endpoint lease, L3 interface prefix, ARP table, default route, and duplicate-IP detection logs. These checks can help with IP addressing subnet and gateway mismatch, 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: An NAE or automation script runs at an excessive rate and appears in the same window as control-plane delays.

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. This action instead applies to Campus access versus aggregation switch portfolio fit. Switch portfolio selection requires platform-specific capability and power-budget verification before selecting a model. It does not directly resolve the controlling requirement. The targeted response is: Apply policing for untrusted ingress excess and shaping where controlled egress pacing is needed, selecting supported switch features. Scenario: A backup transfer experiences bursts and the engineer raises interface speed instead of investigating configured policer drops.

Apply group-level switching policies only after confirming device model compatibility and whether the site is UI-group or template-group managed. This action instead applies to Central UI group versus template configuration scope. Template and UI group management workflows are not interchangeable, especially for device-specific variable substitution. It does not directly resolve the controlling requirement. The targeted response is: Apply policing for untrusted ingress excess and shaping where controlled egress pacing is needed, selecting supported switch features. Scenario: A backup transfer experiences bursts and the engineer raises interface speed instead of investigating configured policer drops.

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: Apply policing for untrusted ingress excess and shaping where controlled egress pacing is needed, selecting supported switch features. Scenario: A backup transfer experiences bursts and the engineer raises interface speed instead of investigating configured policer drops.

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: Discover supported REST versions for each switch and use compatible endpoints rather than hardcoding an obsolete API path. Scenario: A monitoring integration requests a v10.18 resource from a switch running software exposing only an older supported API.

Maintain approved maintenance records, affected path inventory, user notices and postchange validation for recurring wired network work. This action instead applies to Scheduled change window and impact communication. Maintenance success depends on operational coordination as well as command execution and hardware status. It does not directly resolve the controlling requirement. The targeted response is: Discover supported REST versions for each switch and use compatible endpoints rather than hardcoding an obsolete API path. Scenario: A monitoring integration requests a v10.18 resource from a switch running software exposing only an older supported API.

Turn a wired network design into sequenced change steps with prerequisites, measurable acceptance tests, decision gates and rollback. This action instead applies to Implementation plan preflight and rollback criteria. A network drawing is not an implementation plan without timing, safe transitions and testable rollback. It does not directly resolve the controlling requirement. The targeted response is: Discover supported REST versions for each switch and use compatible endpoints rather than hardcoding an obsolete API path. Scenario: A monitoring integration requests a v10.18 resource from a switch running software exposing only an older supported API.

Inspect boot logs, DHCP options, name resolution, management addressing, port VLAN, service accessibility and registration state. These checks can help with ZTP bootstrapping and management plane reachability, but they are not the most discriminating first evidence here. Examine: Inspect serial and MAC claim, subscription, tenant organization, management network DNS/TLS/NTP and switch connectivity to Central. Scenario: A managed service company moves a store switch into the wrong customer's Central tenant and attempts to push policies.

Compare slot inventory, supported modules, forwarding capacity, supervisor architecture, footprint, and lifecycle support. These checks can help with Modular core chassis versus fixed form factor, but they are not the most discriminating first evidence here. Examine: Inspect serial and MAC claim, subscription, tenant organization, management network DNS/TLS/NTP and switch connectivity to Central. Scenario: A managed service company moves a store switch into the wrong customer's Central tenant and attempts to push policies.

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 serial and MAC claim, subscription, tenant organization, management network DNS/TLS/NTP and switch connectivity to Central. Scenario: A managed service company moves a store switch into the wrong customer's Central tenant and attempts to push policies.

Inspect ingress markings, trust mode, class map, queue mapping, device capabilities and egress counters. These checks can help with QoS DSCP trust boundary and class mapping, but they are not the most discriminating first evidence here. Examine: Review traffic direction, rate limits, burst settings, platform QoS resources and class-of-service monitoring. Scenario: A switch is expected to shape traffic on a platform or interface mode without verifying that feature support exists.

Compare live LLDP neighbors, optical transceiver inventory, cable identifiers, rack diagrams and authorized topology. These checks can help with Front-panel and cabling as-built verification, but they are not the most discriminating first evidence here. Examine: Review traffic direction, rate limits, burst settings, platform QoS resources and class-of-service monitoring. Scenario: A switch is expected to shape traffic on a platform or interface mode without verifying that feature support exists.

Inspect LACP neighbor identity, actor/partner keys, aggregated member state, group configuration and per-member counters. These checks can help with LACP aggregation mismatch investigation, but they are not the most discriminating first evidence here. Examine: Review traffic direction, rate limits, burst settings, platform QoS resources and class-of-service monitoring. Scenario: A switch is expected to shape traffic on a platform or interface mode without verifying that feature support exists.

Inspect polling interval, baseline trend, telemetry collection gaps, alert configuration and correlated switch counters. These checks can help with Telemetry false-positive and baseline drift analysis, but they are not the most discriminating first evidence here. Examine: Inspect transceiver identification, Tx/Rx optical levels, fiber connectors, temperature, cable length and port capability. Scenario: A new fiber uplink stays down because both ends use incompatible wavelength optics.

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 transceiver identification, Tx/Rx optical levels, fiber connectors, temperature, cable length and port capability. Scenario: A new fiber uplink stays down because both ends use incompatible wavelength optics.

Check actual watt draw, negotiated 802.3af/at/bt class, switch budget, PSU status and power priorities. These checks can help with Power and PoE field commissioning, but they are not the most discriminating first evidence here. Examine: Inspect transceiver identification, Tx/Rx optical levels, fiber connectors, temperature, cable length and port capability. Scenario: A new fiber uplink stays down because both ends use incompatible wavelength optics.

Correlate performance alarms with actual interface, application and configuration history before treating a reporting threshold as a hardware failure. This action instead applies to Telemetry false-positive and baseline drift analysis. A dashboard spike may be a sampling or threshold artifact; monitoring values require context and reliable collection. It does not directly resolve the controlling requirement. The targeted response is: Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. Scenario: An OSPF uplink is configured in the wrong area and continuously fails neighbor negotiation.

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: Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. Scenario: An OSPF uplink is configured in the wrong area and continuously fails neighbor negotiation.

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: Separate OSPF adjacency failure from absent advertised prefixes by inspecting both neighbor state and routing tables. Scenario: An OSPF uplink is configured in the wrong area and continuously fails neighbor negotiation.

Inspect active configuration context, interface name, running configuration, link state, peer capabilities and software help. This step pertains to AOS-CX interface configuration hierarchy but is not one of the two complementary decisions in this case. The required response and evidence are: Coordinate supported VSX peer and downstream MC-LAG connectivity with the core and access design and confirm peer synchronization boundaries. Together with: Inspect ISL status, VSX keepalive, MC-LAG members, VLAN consistency, active gateway and split-brain protections. Scenario: A downstream access LAG is configured for MC-LAG but the peer switches disagree on VLAN membership.

Configure matching OSPF neighbor parameters, interfaces and area membership, then check route learning after adjacency forms. This step pertains to OSPF adjacency and area configuration but is not one of the two complementary decisions in this case. The required response and evidence are: Coordinate supported VSX peer and downstream MC-LAG connectivity with the core and access design and confirm peer synchronization boundaries. Together with: Inspect ISL status, VSX keepalive, MC-LAG members, VLAN consistency, active gateway and split-brain protections. Scenario: A downstream access LAG is configured for MC-LAG but the peer switches disagree on VLAN membership.

Engineers identify the burst source and validate appropriate capacity or queue controls without inventing a hardware fault. 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: Coordinate supported VSX peer and downstream MC-LAG connectivity with the core and access design and confirm peer synchronization boundaries. Together with: Inspect ISL status, VSX keepalive, MC-LAG members, VLAN consistency, active gateway and split-brain protections. Scenario: A downstream access LAG is configured for MC-LAG but the peer switches disagree on VLAN membership.