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Prepare DHCP, provisioning endpoint reachability, management VLAN or VRF and initial credentials for safe zero-touch provisioning. This action instead applies to ZTP bootstrapping and management plane reachability. ZTP automates bootstrap only when the required discovery and management dependencies function correctly. It does not directly resolve the controlling requirement. The targeted response is: Configure matching OSPF neighbor parameters, interfaces and area membership, then check route learning after adjacency forms. Scenario: A newly configured OSPF neighbor reaches FULL but the destination subnet remains missing from the intended VRF.

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: Configure matching OSPF neighbor parameters, interfaces and area membership, then check route learning after adjacency forms. Scenario: A newly configured OSPF neighbor reaches FULL but the destination subnet remains missing from the intended VRF.

Reconcile the approved design with actual interfaces, optics, firmware, cable labels and final switch configurations after deployment. This action instead applies to Change documentation and as-built reconciliation. The approved design and final operating topology can diverge, requiring documented changes rather than silent drift. It does not directly resolve the controlling requirement. The targeted response is: Configure matching OSPF neighbor parameters, interfaces and area membership, then check route learning after adjacency forms. Scenario: A newly configured OSPF neighbor reaches FULL but the destination subnet remains missing from the intended VRF.

Restore only the approved missing VLAN tags and native VLAN relationship at both ends of an uplink, then test representative hosts. This action instead applies to Correct trunk VLAN remediation. Broadly allowing every VLAN may restore one workload but violate segmentation requirements. It does not directly resolve the controlling requirement. The targeted response is: Build an operational view correlating site reachability, interface error state, routing stability and user impact for prioritized response. Scenario: An on-call engineer receives a high-temperature alert from a lab switch but overlooks a widespread customer outage.

Interpret VSX health, keepalive, ISL, synchronization and active-gateway status before planning peer maintenance. This action instead applies to VSX health telemetry and failover readiness. VSX synchronization status is not equivalent to complete end-to-end forwarding health or upstream route correctness. It does not directly resolve the controlling requirement. The targeted response is: Build an operational view correlating site reachability, interface error state, routing stability and user impact for prioritized response. Scenario: An on-call engineer receives a high-temperature alert from a lab switch but overlooks a widespread customer outage.

Interpret switch resource, interface and protocol snapshots against a known-good baseline and recent change history. This action instead applies to Operational state and baseline configuration differences. A baseline is a set of comparable conditions, not a single healthy green status indicator. It does not directly resolve the controlling requirement. The targeted response is: Build an operational view correlating site reachability, interface error state, routing stability and user impact for prioritized response. Scenario: An on-call engineer receives a high-temperature alert from a lab switch but overlooks a widespread customer outage.

The correct DHCP response traverses the client access path without allowing rogue servers. 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: Apply edge-port and BPDU protection to endpoint-facing ports, preserving expected behavior on real interswitch links. Together with: Inspect port role, connected device, received BPDU counters, configured guard behavior and recovery policy. Scenario: An employee installs a small unmanaged switch on an office jack and causes unexpected topology advertisements.

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: Apply edge-port and BPDU protection to endpoint-facing ports, preserving expected behavior on real interswitch links. Together with: Inspect port role, connected device, received BPDU counters, configured guard behavior and recovery policy. Scenario: An employee installs a small unmanaged switch on an office jack and causes unexpected topology advertisements.

Assign untagged client access ports and explicitly required tagged VLANs to uplinks using supported AOS-CX VLAN interface modes. This step pertains to Access VLAN and trunk allowed-list design but is not one of the two complementary decisions in this case. The required response and evidence are: Apply edge-port and BPDU protection to endpoint-facing ports, preserving expected behavior on real interswitch links. Together with: Inspect port role, connected device, received BPDU counters, configured guard behavior and recovery policy. Scenario: An employee installs a small unmanaged switch on an office jack and causes unexpected topology advertisements.

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 multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: A remote video receiver receives no stream after a routing change breaks PIM's reverse-path check.

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 multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: A remote video receiver receives no stream after a routing change breaks PIM's reverse-path check.

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 multicast group forwarding table, membership timers, querier identity, PIM RPF path and interface counters. Scenario: A remote video receiver receives no stream after a routing change breaks PIM's reverse-path check.

Inspect marked packets, ingress trust, queue drops, egress scheduling and application performance. This step pertains to QoS classification repair with before/after measures but is not one of the two complementary decisions in this case. The required response and evidence are: Identify whether excessive routing updates, loop events or monitoring jobs are consuming CPU and affecting network stability. Together with: 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.

Use VRF-specific routing and interface evidence to diagnose why an otherwise valid prefix is unreachable from a particular context. 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: Identify whether excessive routing updates, loop events or monitoring jobs are consuming CPU and affecting network stability. Together with: 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.

Observed peer relationships match the approved topology, allowing mispatched or unrecognized devices to be isolated. This step pertains to LLDP topology and neighbor mapping but is not one of the two complementary decisions in this case. The required response and evidence are: Identify whether excessive routing updates, loop events or monitoring jobs are consuming CPU and affecting network stability. Together with: 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.

Review change timeline, configuration diff, backups, affected flows, rollback commands and success criteria. These checks can help with Minimal-change rollback and restoration plan, but they are not the most discriminating first evidence here. Examine: Examine client Discover/Offer exchanges, snooping trusted ports, VLAN interface, relay server reachability and binding table. Scenario: A security rollout marks the distribution-facing uplink untrusted and all clients lose addresses.

Review archive permissions, encryption state, retention policy, sensitive fields, backup audit trail and restore rights. These checks can help with Safe configuration archiving and secret handling, but they are not the most discriminating first evidence here. Examine: Examine client Discover/Offer exchanges, snooping trusted ports, VLAN interface, relay server reachability and binding table. Scenario: A security rollout marks the distribution-facing uplink untrusted and all clients lose addresses.

Inspect VSX peer role, keepalive state, ISL counters, MAC or VLAN synchronization and downstream LAG state. These checks can help with VSX peer and keepalive failure symptom isolation, but they are not the most discriminating first evidence here. Examine: Examine client Discover/Offer exchanges, snooping trusted ports, VLAN interface, relay server reachability and binding table. Scenario: A security rollout marks the distribution-facing uplink untrusted and all clients lose addresses.

Use approved MAC authentication or critical-role treatment for devices lacking supplicants with explicit limited privileges and monitoring. This action instead applies to MAC authentication and critical access fallback. MAB is identity based on a spoofable identifier, so its exception path requires narrow permissions and accountability. It does not directly resolve the controlling requirement. The targeted response is: Configure EAP-based access authentication with correct RADIUS reachability, credentials, switch identity and port role behavior. Scenario: A new switch fails RADIUS authentication because its shared secret differs from the identity server.

Apply supported downloadable user roles or dynamic segmentation so authenticated client classes receive consistent least-privilege network access. This action instead applies to Dynamic segmentation downloadable roles policy. Identity-based roles and VLAN assignment are separate configuration layers; a role must download and enforce successfully. It does not directly resolve the controlling requirement. The targeted response is: Configure EAP-based access authentication with correct RADIUS reachability, credentials, switch identity and port role behavior. Scenario: A new switch fails RADIUS authentication because its shared secret differs from the identity server.

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: Configure EAP-based access authentication with correct RADIUS reachability, credentials, switch identity and port role behavior. Scenario: A new switch fails RADIUS authentication because its shared secret differs from the identity server.

Repeated runs converge on the intended configuration without deleting unrelated settings and produce verifiable audit evidence. This step pertains to Idempotent REST updates and config difference verification but is not one of the two complementary decisions in this case. The required response and evidence are: Turn a wired network design into sequenced change steps with prerequisites, measurable acceptance tests, decision gates and rollback. Together with: Review maintenance approval, baselines, device access, console recovery, config backups, support contacts and rollback triggers. Scenario: A migration team declares success after link LEDs turn green without testing routed service reachability.

Review model software release notes, platform feature matrix, hardware resource limits and transceiver compatibility. This step pertains to AOS-CX feature and software compatibility matrix but is not one of the two complementary decisions in this case. The required response and evidence are: Turn a wired network design into sequenced change steps with prerequisites, measurable acceptance tests, decision gates and rollback. Together with: Review maintenance approval, baselines, device access, console recovery, config backups, support contacts and rollback triggers. Scenario: A migration team declares success after link LEDs turn green without testing routed service reachability.

Determine whether an access stack, multi-chassis VSX pair or independent routed switch pair best satisfies topology and failure-control objectives. This step pertains to Resiliency capability evaluation VSX and VSF but is not one of the two complementary decisions in this case. The required response and evidence are: Turn a wired network design into sequenced change steps with prerequisites, measurable acceptance tests, decision gates and rollback. Together with: Review maintenance approval, baselines, device access, console recovery, config backups, support contacts and rollback triggers. Scenario: A migration team declares success after link LEDs turn green without testing routed service reachability.

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 LAG IDs, LACP partner, interface speeds, VLAN modes and member operational state before adjustment. Scenario: One of two 10G uplink members refuses to aggregate after its peer port was moved to another LAG.

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 LAG IDs, LACP partner, interface speeds, VLAN modes and member operational state before adjustment. Scenario: One of two 10G uplink members refuses to aggregate after its peer port was moved to another LAG.

Compare firmware, config diffs, CPU/memory, temperature, traffic rates and log markers for the relevant period. These checks can help with Operational state and baseline configuration differences, 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: One of two 10G uplink members refuses to aggregate after its peer port was moved to another LAG.

Review model firmware compatibility, known issues, rollback image, maintenance window and regression test plan. These checks can help with Validation-first firmware defect remediation, but they are not the most discriminating first evidence here. Examine: 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 root bridge ID, port roles, path cost, MST region consistency and topology change counters. These checks can help with RSTP or MSTP bridge and port role control, but they are not the most discriminating first evidence here. Examine: 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 hello and dead intervals, area ID, authentication, MTU, network type, neighbor state and OSPF routes. These checks can help with OSPF adjacency and area configuration, but they are not the most discriminating first evidence here. Examine: 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.

The installed equipment maintains acceptable temperature and power redundancy, with recoverable console access. 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: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Together with: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.

Inspect root bridge ID, port roles, path cost, MST region consistency and topology change counters. This step pertains to RSTP or MSTP bridge and port role control but is not one of the two complementary decisions in this case. The required response and evidence are: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Together with: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.

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: Enable supported multicast routing mode and appropriate PIM relationships where stream sources and listeners span routed domains. Together with: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A routed multicast tree fails reverse-path forwarding despite reachable source and listener IP addresses.