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Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. 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: 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 edge switch learns the same destination from two sources and prefers a high-latency backup unexpectedly.

Provide a supported resilient default gateway design and test active-forwarding behavior under peer failure. This step pertains to VRRP or active gateway redundant gateway behavior 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 edge switch learns the same destination from two sources and prefers a high-latency backup unexpectedly.

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: 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 edge switch learns the same destination from two sources and prefers a high-latency backup unexpectedly.

Inspect authentication attempt rates, failure/reject categories, RADIUS timing, supplicant behavior and role download logs. These checks can help with Authentication storms and endpoint retry load, but they are not the most discriminating first evidence here. Examine: 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.

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 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.

Inspect local/peer trunk configuration, permitted VLAN list, MAC learning and DHCP/gateway tests. These checks can help with Correct trunk VLAN remediation, but they are not the most discriminating first evidence here. Examine: 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.

Use high-frequency interface and queue evidence to distinguish short microbursts from sustained bandwidth saturation. This action instead applies to Microburst and oversubscription performance analysis. Five-minute average utilization may conceal millisecond microbursts that exhaust shallow queues. It does not directly resolve the controlling requirement. The targeted response is: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Scenario: A host connected to an untagged access port receives an unexpected guest VLAN because port mode was changed.

Configure queue weights or strict priority carefully so latency-sensitive applications receive service without starving other traffic. This action instead applies to Egress queue scheduling and congestion protection. Strict priority and weighted scheduling have distinct tradeoffs; QoS cannot create capacity beyond physical bandwidth. It does not directly resolve the controlling requirement. The targeted response is: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Scenario: A host connected to an untagged access port receives an unexpected guest VLAN because port mode was changed.

Restrict SSH, HTTPS and management VRF exposure and apply individual authenticated administrator roles before enabling remote management. This action instead applies to AOS-CX secure management access setup. Secure management requires both service availability and scoped authorization; turning on HTTPS on every VRF is not a required convenience. It does not directly resolve the controlling requirement. The targeted response is: Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. Scenario: A host connected to an untagged access port receives an unexpected guest VLAN because port mode was changed.

Monitor authentication success ratios, rejected sessions, policy role assignment and known exception endpoints by switch/site. This action instead applies to Client authentication and port-role operational reports. Auth rate and authorization role must both be checked; success in RADIUS does not guarantee usable network access. It does not directly resolve the controlling requirement. The targeted response is: Restrict SSH, HTTPS and management VRF exposure and apply individual authenticated administrator roles before enabling remote management. Scenario: A campus engineer exposes the REST API on an unrestricted production data VRF for temporary automation.

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: Restrict SSH, HTTPS and management VRF exposure and apply individual authenticated administrator roles before enabling remote management. Scenario: A campus engineer exposes the REST API on an unrestricted production data VRF for temporary automation.

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: Restrict SSH, HTTPS and management VRF exposure and apply individual authenticated administrator roles before enabling remote management. Scenario: A campus engineer exposes the REST API on an unrestricted production data VRF for temporary automation.

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 maintenance approval, baselines, device access, console recovery, config backups, support contacts and rollback triggers. Scenario: An overnight cutover starts before teams capture running configurations or define a restoration path.

Inspect local/peer trunk configuration, permitted VLAN list, MAC learning and DHCP/gateway tests. These checks can help with Correct trunk VLAN remediation, but they are not the most discriminating first evidence here. Examine: Review maintenance approval, baselines, device access, console recovery, config backups, support contacts and rollback triggers. Scenario: An overnight cutover starts before teams capture running configurations or define a restoration path.

Inspect license tiers, serial entitlement, firmware support, account ownership and permitted network access. These checks can help with Campus management and licensing boundaries, but they are not the most discriminating first evidence here. Examine: Review maintenance approval, baselines, device access, console recovery, config backups, support contacts and rollback triggers. Scenario: An overnight cutover starts before teams capture running configurations or define a restoration path.

Examine egress buffer occupancy and queue allocation for traffic-class contention rather than interpreting all latency as routing delay. This step pertains to Packet buffer pressure and head-of-line impact but is not one of the two complementary decisions in this case. The required response and evidence are: Correlate performance alarms with actual interface, application and configuration history before treating a reporting threshold as a hardware failure. Together with: 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.

Traffic uses intended primary or equal-cost links, and backup paths assume load when the active route fails. This step pertains to OSPF and BGP route preference and ECMP planning but is not one of the two complementary decisions in this case. The required response and evidence are: Correlate performance alarms with actual interface, application and configuration history before treating a reporting threshold as a hardware failure. Together with: 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 LAG IDs, LACP partner, interface speeds, VLAN modes and member operational state before adjustment. 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: Correlate performance alarms with actual interface, application and configuration history before treating a reporting threshold as a hardware failure. Together with: 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 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: Check endpoint identity, allowed MAC profiles, primary 802.1X attempts, fallback order, authentication timeout and role policy. Scenario: When RADIUS is unreachable every device receives an unrestricted role, defeating the site's isolation policy.

Inspect RADIUS server reachability/secret, authentication session state, EAP exchange, assigned role and rejection logs. These checks can help with 802.1X and RADIUS port authentication, but they are not the most discriminating first evidence here. Examine: Check endpoint identity, allowed MAC profiles, primary 802.1X attempts, fallback order, authentication timeout and role policy. Scenario: When RADIUS is unreachable every device receives an unrestricted role, defeating the site's isolation policy.

Inspect role download status, authentication result, role mapping, ACL application, device/platform support and enforcement counters. These checks can help with Dynamic segmentation downloadable roles policy, but they are not the most discriminating first evidence here. Examine: Check endpoint identity, allowed MAC profiles, primary 802.1X attempts, fallback order, authentication timeout and role policy. Scenario: When RADIUS is unreachable every device receives an unrestricted role, defeating the site's isolation policy.

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 step pertains to Campus access versus aggregation switch portfolio fit but is not one of the two complementary decisions in this case. The required response and evidence are: Confirm required AOS-CX capabilities against exact switch series and firmware before committing to routing, overlays or security services. Together with: 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 interface-to-interface maps, VSX ISL or VSF links, keepalive transport, LAG membership and independent power routes. This step pertains to Resilient peer cabling and link map but is not one of the two complementary decisions in this case. The required response and evidence are: Confirm required AOS-CX capabilities against exact switch series and firmware before committing to routing, overlays or security services. Together with: 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.

Device records match live hardware and allow reliable entitlement checks and fault replacement without hidden licensing risk. This step pertains to Inventory and licensing lifecycle control but is not one of the two complementary decisions in this case. The required response and evidence are: Confirm required AOS-CX capabilities against exact switch series and firmware before committing to routing, overlays or security services. Together with: 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.

Inspect per-VRF interface ownership, route table, import/export controls and packet path security enforcement. These checks can help with VRF and route-leak correction, but they are not the most discriminating first evidence here. Examine: Inspect endpoint lease, L3 interface prefix, ARP table, default route, and duplicate-IP detection logs. Scenario: A laptop leases an old default gateway after its branch migrated to a new SVI.

Inspect PHY speed, autonegotiation, FCS/CRC, runts, cable test and optic telemetry. These checks can help with Duplex speed and physical error performance analysis, but they are not the most discriminating first evidence here. Examine: Inspect endpoint lease, L3 interface prefix, ARP table, default route, and duplicate-IP detection logs. Scenario: A laptop leases an old default gateway after its branch migrated to a new SVI.

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 endpoint lease, L3 interface prefix, ARP table, default route, and duplicate-IP detection logs. Scenario: A laptop leases an old default gateway after its branch migrated to a new SVI.

Observed peer relationships match the approved topology, allowing mispatched or unrecognized devices to be isolated. This result is associated with LLDP topology and neighbor mapping; it does not demonstrate the requested network behavior. The relevant acceptance test is: Expected adjacencies reach full state and intended prefixes enter the routing table with correct reachability. Scenario: An OSPF site link never forms adjacency after being assigned to different areas at each end.

The intended switch is visible as managed in the correct Central group with current telemetry and only authorized policy applied. This result is associated with Aruba Central inventory onboarding and assignment; it does not demonstrate the requested network behavior. The relevant acceptance test is: Expected adjacencies reach full state and intended prefixes enter the routing table with correct reachability. Scenario: An OSPF site link never forms adjacency after being assigned to different areas at each end.

All live uplinks match recorded peer and fiber paths without creating an unplanned single point of failure. This result is associated with Front-panel and cabling as-built verification; it does not demonstrate the requested network behavior. The relevant acceptance test is: Expected adjacencies reach full state and intended prefixes enter the routing table with correct reachability. Scenario: An OSPF site link never forms adjacency after being assigned to different areas at each end.

Inspect role download status, authentication result, role mapping, ACL application, device/platform support and enforcement counters. These checks can help with Dynamic segmentation downloadable roles policy, but they are not the most discriminating first evidence here. Examine: Inspect active configuration context, interface name, running configuration, link state, peer capabilities and software help. Scenario: An operator pastes legacy switch CLI for a trunk and AOS-CX rejects or misinterprets it.

Inspect target resource, writable fields, current object representation, HTTP status, expected diff and checkpoint restore path. These checks can help with Idempotent REST updates and config difference verification, but they are not the most discriminating first evidence here. Examine: Inspect active configuration context, interface name, running configuration, link state, peer capabilities and software help. Scenario: An operator pastes legacy switch CLI for a trunk and AOS-CX rejects or misinterprets it.

Check endpoint identity, allowed MAC profiles, primary 802.1X attempts, fallback order, authentication timeout and role policy. These checks can help with MAC authentication and critical access fallback, but they are not the most discriminating first evidence here. Examine: Inspect active configuration context, interface name, running configuration, link state, peer capabilities and software help. Scenario: An operator pastes legacy switch CLI for a trunk and AOS-CX rejects or misinterprets it.