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Repair a proven VRF interface assignment or route leak rule while preventing unrelated tenant reachability. This step pertains to VRF and route-leak correction but is not one of the two complementary decisions in this case. The required response and evidence are: Examine egress buffer occupancy and queue allocation for traffic-class contention rather than interpreting all latency as routing delay. Together with: Inspect queue backlog, buffer thresholds, drop reasons, burst traffic composition and port egress rates. Scenario: A traffic-engineering change reserves nearly all output queue resources for one low-volume priority service.

The as-built record accurately describes the live network and can be used for future fault isolation. 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: Examine egress buffer occupancy and queue allocation for traffic-class contention rather than interpreting all latency as routing delay. Together with: Inspect queue backlog, buffer thresholds, drop reasons, burst traffic composition and port egress rates. Scenario: A traffic-engineering change reserves nearly all output queue resources for one low-volume priority service.

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: Examine egress buffer occupancy and queue allocation for traffic-class contention rather than interpreting all latency as routing delay. Together with: Inspect queue backlog, buffer thresholds, drop reasons, burst traffic composition and port egress rates. Scenario: A traffic-engineering change reserves nearly all output queue resources for one low-volume priority service.

Use the correct AOS-CX interface context and verify administrative state, speed and VLAN mode rather than reusing unrelated switch-vendor syntax. This action instead applies to AOS-CX interface configuration hierarchy. Interface commands operate in specific contexts; correct syntax alone does not confirm that the intended port or mode was changed. 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: A distribution OSPF adjacency reaches FULL but the remote management subnet never appears in routes.

Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. This action instead applies to Multicast flooding and receiver path performance. Multicast forwarding depends on group state and querier or PIM control, not merely the VLAN number. 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: A distribution OSPF adjacency reaches FULL but the remote management subnet never appears in routes.

Trace both traffic directions, routing next hops and LAG/ECMP distribution before blaming total switch fabric capacity. This action instead applies to Asymmetric path and ECMP hash performance analysis. A link aggregate distributes by hashes; one elephant flow may not use every available member simultaneously. 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: A distribution OSPF adjacency reaches FULL but the remote management subnet never appears in routes.

Use LLDP neighbor data and interface inventories to verify connected peers and document the physical campus topology. This action instead applies to LLDP topology and neighbor mapping. LLDP is discovery evidence but neighbor advertisements do not prove the entire end-to-end forwarding path is authorized. It does not directly resolve the controlling requirement. The targeted response is: Attribute application loss to the actual congested egress queue and traffic class rather than only interface-level packet drops. Scenario: Video calls break only when backups run, and high-priority queue drops increase during the window.

Locate excess multicast replication or lost group membership using IGMP/PIM state and per-port traffic evidence. This action instead applies to Multicast flooding and receiver path performance. Multicast forwarding depends on group state and querier or PIM control, not merely the VLAN number. It does not directly resolve the controlling requirement. The targeted response is: Attribute application loss to the actual congested egress queue and traffic class rather than only interface-level packet drops. Scenario: Video calls break only when backups run, and high-priority queue drops increase during the window.

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: Attribute application loss to the actual congested egress queue and traffic class rather than only interface-level packet drops. Scenario: Video calls break only when backups run, and high-priority queue drops increase during the window.

Forward and reverse flows follow supported policy and the perceived bottleneck is linked to measurable path imbalance. This step pertains to Asymmetric path and ECMP hash performance analysis but is not one of the two complementary decisions in this case. The required response and evidence are: Schedule VLAN creation, trunk allowance, SVI services and routing prerequisites before switching live endpoint traffic. Together with: Inspect allowed VLAN lists, IP plans, gateway addresses, routes and dependency owners at each change stage. Scenario: A phased installation moves servers to a new VLAN while its DHCP relay target is not yet reachable.

Check powered endpoints, PoE class, uplink optics, stack or VSX requirements, interfaces and supported software for candidate models. 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: Schedule VLAN creation, trunk allowance, SVI services and routing prerequisites before switching live endpoint traffic. Together with: Inspect allowed VLAN lists, IP plans, gateway addresses, routes and dependency owners at each change stage. Scenario: A phased installation moves servers to a new VLAN while its DHCP relay target is not yet reachable.

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: Schedule VLAN creation, trunk allowance, SVI services and routing prerequisites before switching live endpoint traffic. Together with: Inspect allowed VLAN lists, IP plans, gateway addresses, routes and dependency owners at each change stage. Scenario: A phased installation moves servers to a new VLAN while its DHCP relay target is not yet reachable.

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: Inspect TCP reachability, neighbor remote AS, update source, next hop, accepted/advertised prefixes and policy counters. Scenario: A new export policy advertises a private management prefix to an external peer, violating design intent.

Inspect authorized DHCP server ports, binding tables, protected VLANs, ARP counters and switch feature support. These checks can help with Port security and DHCP/ARP spoofing defenses, but they are not the most discriminating first evidence here. Examine: Inspect TCP reachability, neighbor remote AS, update source, next hop, accepted/advertised prefixes and policy counters. Scenario: A new export policy advertises a private management prefix to an external peer, violating design intent.

Inspect stack topology, member state, link health, firmware compatibility, commander role and split detection. These checks can help with VSF stack topology and member replacement, but they are not the most discriminating first evidence here. Examine: Inspect TCP reachability, neighbor remote AS, update source, next hop, accepted/advertised prefixes and policy counters. Scenario: A new export policy advertises a private management prefix to an external peer, violating design intent.

Interpret sustained and peak port utilization alongside errors, queue drops and application quality before deciding on upgrades. This action instead applies to Interface utilization and capacity trend interpretation. Long-term averages alone may hide microbursts or fail to prove that a slow application requires a faster physical port. It does not directly resolve the controlling requirement. The targeted response is: Replace only a proven faulty transceiver, cable or interface path with supported parts and validate clean counters afterward. Scenario: An uplink shows repeated symbol errors on one switch port while the alternative path remains clean.

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: Replace only a proven faulty transceiver, cable or interface path with supported parts and validate clean counters afterward. Scenario: An uplink shows repeated symbol errors on one switch port while the alternative path remains clean.

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: Replace only a proven faulty transceiver, cable or interface path with supported parts and validate clean counters afterward. Scenario: An uplink shows repeated symbol errors on one switch port while the alternative path remains clean.

Inspect identity server reachability, time synchronization, EAP settings, downloadable role support, exceptions and emergency access. These checks can help with Security and authentication migration coordination, but they are not the most discriminating first evidence here. Examine: Examine site topology, switch count, uplink capacity, failure domains and convergence requirements. Scenario: A multi-building campus wants a single distribution switch and overlooks the failure domain it creates.

Review site power circuits, PSU ratings, environmental constraints, rack elevations and OOB console reachability. These checks can help with Physical installation and rack power implementation, but they are not the most discriminating first evidence here. Examine: Examine site topology, switch count, uplink capacity, failure domains and convergence requirements. Scenario: A multi-building campus wants a single distribution switch and overlooks the failure domain it creates.

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: Examine site topology, switch count, uplink capacity, failure domains and convergence requirements. Scenario: A multi-building campus wants a single distribution switch and overlooks the failure domain it creates.

Prepare DHCP, provisioning endpoint reachability, management VLAN or VRF and initial credentials for safe zero-touch provisioning. This step pertains to ZTP bootstrapping and management plane reachability but is not one of the two complementary decisions in this case. The required response and evidence are: Apply group-level switching policies only after confirming device model compatibility and whether the site is UI-group or template-group managed. Together with: Review Central group type, effective configuration, variable bindings, supported template syntax and local override restrictions. Scenario: A multisite template hardcodes one gateway address and creates overlapping SVIs at remote branches.

Operators detect abnormal environment or power faults early and verify that redundant components protect the intended load. This step pertains to Environmental and power health monitoring but is not one of the two complementary decisions in this case. The required response and evidence are: Apply group-level switching policies only after confirming device model compatibility and whether the site is UI-group or template-group managed. Together with: Review Central group type, effective configuration, variable bindings, supported template syntax and local override restrictions. Scenario: A multisite template hardcodes one gateway address and creates overlapping SVIs at remote branches.

Inspect transceiver identification, Tx/Rx optical levels, fiber connectors, temperature, cable length and port capability. This step pertains to Optic insertion and physical layer preflight but is not one of the two complementary decisions in this case. The required response and evidence are: Apply group-level switching policies only after confirming device model compatibility and whether the site is UI-group or template-group managed. Together with: Review Central group type, effective configuration, variable bindings, supported template syntax and local override restrictions. Scenario: A multisite template hardcodes one gateway address and creates overlapping SVIs at remote branches.

The chosen switch provides the required physical connectivity and resilient uplinks at documented load and without an unsupported feature assumption. This result is associated with Campus access versus aggregation switch portfolio fit; it does not demonstrate the requested network behavior. The relevant acceptance test is: A single uplink or chassis link failure leaves the supported peer topology in a predictable operating state. Scenario: A design lists two core uplinks but both traverse a single unprotected patch-panel bundle.

The end-to-end link establishes at the intended speed with acceptable power levels and no unsupported optics alarms. This result is associated with Optical and copper media compatibility; it does not demonstrate the requested network behavior. The relevant acceptance test is: A single uplink or chassis link failure leaves the supported peer topology in a predictable operating state. Scenario: A design lists two core uplinks but both traverse a single unprotected patch-panel bundle.

Receivers on remote VLANs join approved streams through valid routed multicast trees without unicast routing regressions. This result is associated with PIM and multicast routed-path validation; it does not demonstrate the requested network behavior. The relevant acceptance test is: A single uplink or chassis link failure leaves the supported peer topology in a predictable operating state. Scenario: A design lists two core uplinks but both traverse a single unprotected patch-panel bundle.

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: Inspect per-queue transmitted/dropped packets, DSCP mapping, shaping/policing, link utilization and application latency. Scenario: A newly trusted DSCP marking pushes all user traffic into one queue and other traffic stalls.

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 per-queue transmitted/dropped packets, DSCP mapping, shaping/policing, link utilization and application latency. Scenario: A newly trusted DSCP marking pushes all user traffic into one queue and other traffic stalls.

Inspect ingress VRF, SVI assignment, per-VRF routes, next-hop resolution, leak policy and permitted firewall path. These checks can help with VRF route-table mismatch investigation, but they are not the most discriminating first evidence here. Examine: Inspect per-queue transmitted/dropped packets, DSCP mapping, shaping/policing, link utilization and application latency. Scenario: A newly trusted DSCP marking pushes all user traffic into one queue and other traffic stalls.

Subscribers receive expected streams without flooding non-subscribing access ports or triggering avoidable congestion. This step pertains to Multicast flooding and receiver path performance but is not one of the two complementary decisions in this case. The required response and evidence are: Use supported AOS-CX API endpoints and role-scoped service accounts for automations, separating read-only audits from approved changes. Together with: Check active REST API version, authentication mode, target VRF, transaction response, desired diff and audit trail. Scenario: A REST PUT request omits existing settings and the team fails to review the full object mutation risk.

Inspect NAD records, authentication source, RADIUS VSAs, role mapping, certificate path and endpoint policy. This step pertains to ClearPass or identity-service policy integration but is not one of the two complementary decisions in this case. The required response and evidence are: Use supported AOS-CX API endpoints and role-scoped service accounts for automations, separating read-only audits from approved changes. Together with: Check active REST API version, authentication mode, target VRF, transaction response, desired diff and audit trail. Scenario: A REST PUT request omits existing settings and the team fails to review the full object mutation risk.

Coordinate supported VSX peer and downstream MC-LAG connectivity with the core and access design and confirm peer synchronization boundaries. This step pertains to VSX and aggregation integration verification but is not one of the two complementary decisions in this case. The required response and evidence are: Use supported AOS-CX API endpoints and role-scoped service accounts for automations, separating read-only audits from approved changes. Together with: Check active REST API version, authentication mode, target VRF, transaction response, desired diff and audit trail. Scenario: A REST PUT request omits existing settings and the team fails to review the full object mutation risk.