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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 endpoint lease, L3 interface prefix, ARP table, default route, and duplicate-IP detection logs. Scenario: Two hosts on the same VLAN claim the same IP and traffic oscillates between MAC entries.

Inspect peak counters, buffers, burst duration, port rates, packet loss and affected application flows. These checks can help with Microburst and oversubscription 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: Two hosts on the same VLAN claim the same IP and traffic oscillates between MAC entries.

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: Inspect endpoint lease, L3 interface prefix, ARP table, default route, and duplicate-IP detection logs. Scenario: Two hosts on the same VLAN claim the same IP and traffic oscillates between MAC entries.

Check group membership entries, IGMP reports, snooping state, querier address and stream receiver path. These checks can help with IGMP snooping L2 multicast receiver control, but they are not the most discriminating first evidence here. Examine: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A multicast video source works in its own VLAN but no remote site receives the group across a routed boundary.

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: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A multicast video source works in its own VLAN but no remote site receives the group across a routed boundary.

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: Inspect reverse-path forwarding, PIM neighbors, rendezvous-point design if applicable, multicast route state and IGMP memberships. Scenario: A multicast video source works in its own VLAN but no remote site receives the group across a routed boundary.

Inspect routing process events, neighbor restart counters, route-table changes, forwarding next hops and convergence timestamps. These checks can help with Routing adjacency and convergence telemetry interpretation, but they are not the most discriminating first evidence here. Examine: Check temperature sensors, fan speed alarms, power supply redundancy, PoE consumption and event history. Scenario: A redundant core reports one failed PSU while the power audit still claims full resilience.

Check template parameter coverage, model firmware, intended diffs, test switch result, scope and staged deployment audit. These checks can help with Config template test and promotion pipeline, but they are not the most discriminating first evidence here. Examine: Check temperature sensors, fan speed alarms, power supply redundancy, PoE consumption and event history. Scenario: A redundant core reports one failed PSU while the power audit still claims full resilience.

Inspect VLAN inventory, per-interface native versus tagged behavior, allowed VLANs and peer trunk configuration. These checks can help with Access VLAN and trunk allowed-list design, but they are not the most discriminating first evidence here. Examine: Check temperature sensors, fan speed alarms, power supply redundancy, PoE consumption and event history. Scenario: A redundant core reports one failed PSU while the power audit still claims full resilience.

An automation job reads supported configuration and state consistently across targeted platforms with version-aware error handling. This step pertains to AOS-CX REST API version discovery and compatibility but is not one of the two complementary decisions in this case. The required response and evidence are: Differentiate a legitimate redundant STP blocked port from a physical link failure or topology loop using bridge-state evidence. Together with: Check root bridge ID, port role/state, BPDU activity, topology change count and MAC instability. Scenario: After adding a new switch, campus broadcasts rise and MAC addresses move rapidly between two uplinks.

Inspect local/peer trunk configuration, permitted VLAN list, MAC learning and DHCP/gateway tests. This step pertains to Correct trunk VLAN remediation but is not one of the two complementary decisions in this case. The required response and evidence are: Differentiate a legitimate redundant STP blocked port from a physical link failure or topology loop using bridge-state evidence. Together with: Check root bridge ID, port role/state, BPDU activity, topology change count and MAC instability. Scenario: After adding a new switch, campus broadcasts rise and MAC addresses move rapidly between two uplinks.

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: Differentiate a legitimate redundant STP blocked port from a physical link failure or topology loop using bridge-state evidence. Together with: Check root bridge ID, port role/state, BPDU activity, topology change count and MAC instability. Scenario: After adding a new switch, campus broadcasts rise and MAC addresses move rapidly between two uplinks.

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 counter rates, monitoring interval, interface speed, burst peaks, growth trend and service-level effects. Scenario: An operations dashboard recommends replacing a switch because one single-day graph has a transient peak.

Review NAE script/agent availability, monitored REST URI, alert condition, historical timeline, privileges and resource impact. These checks can help with NAE agent and threshold monitoring, but they are not the most discriminating first evidence here. Examine: Inspect counter rates, monitoring interval, interface speed, burst peaks, growth trend and service-level effects. Scenario: An operations dashboard recommends replacing a switch because one single-day graph has a transient peak.

Inspect local/remote port IDs, system descriptions, LLDP freshness, link MACs and expected cable map. These checks can help with LLDP topology and neighbor mapping, but they are not the most discriminating first evidence here. Examine: Inspect counter rates, monitoring interval, interface speed, burst peaks, growth trend and service-level effects. Scenario: An operations dashboard recommends replacing a switch because one single-day graph has a transient peak.

Priority traffic improves at congestion without silently starving business-critical bulk services. This result is associated with QoS classification repair with before/after measures; it does not demonstrate the requested network behavior. The relevant acceptance test is: The link stabilizes with no recurring CRC/LOS errors and normal forwarding on the intended path. Scenario: A technician plans to swap an SFP+ optic with an unsupported model solely because the connector fits.

The missing VLAN forwards across the uplink while guest and management VLANs remain isolated. This result is associated with Correct trunk VLAN remediation; it does not demonstrate the requested network behavior. The relevant acceptance test is: The link stabilizes with no recurring CRC/LOS errors and normal forwarding on the intended path. Scenario: A technician plans to swap an SFP+ optic with an unsupported model solely because the connector fits.

The exact intended physical or logical port has valid configuration and operational link state without affecting neighboring ports. This result is associated with AOS-CX interface configuration hierarchy; it does not demonstrate the requested network behavior. The relevant acceptance test is: The link stabilizes with no recurring CRC/LOS errors and normal forwarding on the intended path. Scenario: A technician plans to swap an SFP+ optic with an unsupported model solely because the connector fits.

Inspect VRRP role/priority or VSX active gateway configuration, virtual MAC/IP, peer state and ARP entries. These checks can help with VRRP or active gateway redundant gateway behavior, 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: An aggregation link repeatedly flaps when one incompatible transceiver is inserted during a campus upgrade.

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: Inspect transceiver identification, Tx/Rx optical levels, fiber connectors, temperature, cable length and port capability. Scenario: An aggregation link repeatedly flaps when one incompatible transceiver is inserted during a campus upgrade.

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: An aggregation link repeatedly flaps when one incompatible transceiver is inserted during a campus upgrade.

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: Inspect VLAN inventory, per-interface native versus tagged behavior, allowed VLANs and peer trunk configuration. Scenario: An access switch carries VLAN 120 locally but does not allow it across the distribution uplink.

Check interface-to-interface maps, VSX ISL or VSF links, keepalive transport, LAG membership and independent power routes. These checks can help with Resilient peer cabling and link map, but they are not the most discriminating first evidence here. Examine: Inspect VLAN inventory, per-interface native versus tagged behavior, allowed VLANs and peer trunk configuration. Scenario: An access switch carries VLAN 120 locally but does not allow it across the distribution uplink.

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 VLAN inventory, per-interface native versus tagged behavior, allowed VLANs and peer trunk configuration. Scenario: An access switch carries VLAN 120 locally but does not allow it across the distribution uplink.

Check enabled management services by VRF, ACLs, user roles, TLS/SSH settings, logging, NTP and out-of-band recovery. This step pertains to AOS-CX secure management access setup but is not one of the two complementary decisions in this case. The required response and evidence are: Use separate VRFs for management, corporate, and guest routing where specified, with explicit approved inter-VRF connectivity. Together with: Check per-VRF interfaces and routes, policy-based leaks, next hop resolution and source/destination acceptance tests. Scenario: A new redistribution rule accidentally imports customer-specific routes into a shared services VRF.

Validate PoE power supply capacity, cable pairs and endpoint class before activating powered devices or redundant PSU policies. This step pertains to Power and PoE field commissioning but is not one of the two complementary decisions in this case. The required response and evidence are: Use separate VRFs for management, corporate, and guest routing where specified, with explicit approved inter-VRF connectivity. Together with: Check per-VRF interfaces and routes, policy-based leaks, next hop resolution and source/destination acceptance tests. Scenario: A new redistribution rule accidentally imports customer-specific routes into a shared services VRF.

The deployed switch supports expected expansion without immediate port exhaustion, power shedding or oversubscribed uplinks. This step pertains to Port density and growth headroom but is not one of the two complementary decisions in this case. The required response and evidence are: Use separate VRFs for management, corporate, and guest routing where specified, with explicit approved inter-VRF connectivity. Together with: Check per-VRF interfaces and routes, policy-based leaks, next hop resolution and source/destination acceptance tests. Scenario: A new redistribution rule accidentally imports customer-specific routes into a shared services VRF.

The failed physical segment or module is identified and replaced or repaired, restoring a stable error-free link. This step pertains to Physical link failure diagnostics but is not one of the two complementary decisions in this case. The required response and evidence are: Validate AOS-CX configuration templates against supported platform variants and preproduction devices before broad rollout. Together with: Check template parameter coverage, model firmware, intended diffs, test switch result, scope and staged deployment audit. Scenario: A site-specific gateway variable is blank and the template deploys an incomplete SVI to dozens of branches.

Review API role, HTTPS service VRF, TLS validation, token storage, resource responses and request logs. This step pertains to Read-only REST audit and secure token handling but is not one of the two complementary decisions in this case. The required response and evidence are: Validate AOS-CX configuration templates against supported platform variants and preproduction devices before broad rollout. Together with: Check template parameter coverage, model firmware, intended diffs, test switch result, scope and staged deployment audit. Scenario: A site-specific gateway variable is blank and the template deploys an incomplete SVI to dozens of branches.

Establish prechange checkpoints, defined retention and restore testing for AOS-CX configuration changes across managed devices. This step pertains to Configuration checkpoint and rollback retention but is not one of the two complementary decisions in this case. The required response and evidence are: Validate AOS-CX configuration templates against supported platform variants and preproduction devices before broad rollout. Together with: Check template parameter coverage, model firmware, intended diffs, test switch result, scope and staged deployment audit. Scenario: A site-specific gateway variable is blank and the template deploys an incomplete SVI to dozens of branches.