The alternative targets route missing in correct VRF, where separate VRFs maintain distinct forwarding information bases; routes visible in one context do not automatically apply in another. It does not establish the intended missing default gateway behavior described in the scenario.

A frame cannot traverse a trunk on which its tagged VLAN is not allowed; local endpoint configuration can be fully correct. Trace VLAN membership across each intervening trunk and restore the missing permitted VLAN. would address missing trunk VLAN, but the reported facts instead point to missing default gateway. That change would leave the actual requirement unresolved.

That action—Check VLAN operational state and active interface membership when an SVI is down—is relevant to SVI down due to VLAN state. A configured SVI cannot act as the client gateway without operational Layer 2 underlay and correct interface state. It does not correct the observed missing default gateway condition.

A performance gain is not acceptable if it weakens required access boundaries; improvements must meet both service and security acceptance criteria. The indicated result—post-change tests show better permitted-traffic performance and unchanged denial of prohibited flows—checks a different mechanism and would not confirm the required voice queuing under load outcome.

This would validate traffic policing versus shaping, not voice queuing under load. Traffic shaping delays packets to smooth bursts, whereas policing enforces a rate by dropping or remarking nonconforming traffic; operational tradeoffs differ. It is therefore insufficient acceptance evidence for the reported condition.

That result—Peak legitimate discovery succeeds and a simulated excessive broadcast rate triggers the intended bounded protection—concerns storm control tuning. Overly aggressive limits can discard necessary discovery traffic, while absent protection permits broadcasts to overwhelm forwarding capacity. It can be healthy even while the current voice queuing under load problem remains.

VSX peers retain independent control planes and only designated supported feature sets synchronize; unchecked settings may diverge. The indicated result—both VSX peers display expected synchronized state and intentional independent routing configurations remain correct—checks a different mechanism and would not confirm the required VRRP gateway resilience outcome.

That result—The registered device reaches only its designated services and unknown MAC identities are denied or quarantined—concerns MAC authentication for headless devices. MAC authentication can support devices without a supplicant but is weaker than cryptographic identity, so narrow policy and inventory are essential. It can be healthy even while the current VRRP gateway resilience problem remains.

This would validate VSF member management, not VRRP gateway resilience. VSF presents supported physical members as a virtual switch while retaining operational requirements for healthy stacking links and member state. It is therefore insufficient acceptance evidence for the reported condition.

That result—The change ticket links a verified baseline configuration and a tested restoration procedure—concerns configuration backup before changes. Reversible change management requires knowing the previous effective state, not merely retaining a screenshot of intended edits. It can be healthy even while the current config drift after manual overrides problem remains.

This would validate topology and documentation currency, not config drift after manual overrides. Operational documents are useful only when they reflect the running state and its change history; stale diagrams waste troubleshooting effort. It is therefore insufficient acceptance evidence for the reported condition.

Software changes can alter forwarding, management or authentication behavior, so a limited pilot provides evidence before broad deployment. The indicated result—a pilot validates critical services and the production plan provides checkpoints, maintenance windows and restoration conditions—checks a different mechanism and would not confirm the required config drift after manual overrides outcome.

This would validate firmware-induced configuration drift, not missing default gateway. Successful reboot and version display do not establish that all intended policies and interface behaviors survived the change. It is therefore insufficient acceptance evidence for the reported condition.

That result—Packet and session evidence shows traffic and permitted replies follow paths accepted by the relevant stateful controls—concerns asymmetric path enforcement. Stateful firewalls can drop replies they did not see established; checking only the outbound route misses asymmetric forwarding. It can be healthy even while the current missing default gateway problem remains.

A configured SVI cannot act as the client gateway without operational Layer 2 underlay and correct interface state. The indicated result—the VLAN interface becomes operational with expected active members and responds to approved gateway tests—checks a different mechanism and would not confirm the required missing default gateway outcome.

That result—The maintained records identify current connections, configuration owners, network segments and the last validated change—concerns topology and documentation currency. Operational documents are useful only when they reflect the running state and its change history; stale diagrams waste troubleshooting effort. It can be healthy even while the current firmware compatibility dependency problem remains.

Successful application traffic is only half of policy correctness; overbroad authorization can create exposure while the reported symptom appears resolved. The indicated result—positive and negative flow tests confirm approved connectivity and continuing rejection of disallowed destinations—checks a different mechanism and would not confirm the required firmware compatibility dependency outcome.

This would validate config drift after manual overrides, not firmware compatibility dependency. Undocumented differences make subsequent upgrades and incident response unpredictable because the managed baseline is no longer authoritative. It is therefore insufficient acceptance evidence for the reported condition.

IGMP membership information lets switches constrain Layer 2 multicast distribution instead of flooding traffic indiscriminately. Enable appropriate IGMP snooping and multicast forwarding behavior for subscriber VLANs. would address multicast receiver handling, but the reported facts instead point to VSX keepalive isolation. That change would leave the actual requirement unresolved.

The alternative targets classic Central site versus group, where classic Central uses groups to distribute shared configuration while sites provide physical-location organization, so modifying location alone need not change running intent. It does not establish the intended VSX keepalive isolation behavior described in the scenario.

That action—Configure a controlled default route and distribute it only where the campus topology requires—is relevant to default-route propagation. A routing protocol's internal adjacency does not guarantee a usable route for unknown destinations; a valid and authorized default egress is needed. It does not correct the observed VSX keepalive isolation condition.

A healthy neighbor relationship does not imply every desired route is present; network statements, redistribution and policy can omit a prefix. The indicated result—core routers learn the correct new prefix with an intended next hop and return traffic succeeds—checks a different mechanism and would not confirm the required EAP-TLS trust-chain failure outcome.

That result—The guest device reliably reaches the portal and receives only its intended post-login access—concerns captive portal redirect fault. A guest can associate and receive a lease without completing the portal flow; redirect and pre-auth policy must permit necessary portal dependencies. It can be healthy even while the current EAP-TLS trust-chain failure problem remains.

This would validate RF interference and retries, not EAP-TLS trust-chain failure. Strong signal cannot cure collisions or non-Wi-Fi interference; airtime contention and retransmission consume the shared radio medium. It is therefore insufficient acceptance evidence for the reported condition.

That result—The logical design maps each user or device class to its VLAN or routed segment and approved inter-segment access—concerns VLAN and subnet segmentation. Separate segments help control broadcast reachability and policy scope; a VLAN label alone is not an authorization policy. It can be healthy even while the current failure-domain isolation problem remains.

This would validate VSF versus VSX platform planning, not failure-domain isolation. VSF forms a virtual switch with supported stacking members; VSX coordinates two peers while retaining separate control planes, so support and failure domains differ. It is therefore insufficient acceptance evidence for the reported condition.

Product capabilities and configuration syntax depend on supported hardware and software releases; a feature described in another model's guide may be unavailable. The indicated result—the compatibility matrix references the correct device families and supported release before installation begins—checks a different mechanism and would not confirm the required failure-domain isolation outcome.

Traffic bound for other subnets needs a reachable Layer 3 next hop; a functioning local broadcast domain does not provide routing. The indicated result—the client ARPs or resolves the correct first hop and successfully reaches an approved remote subnet—checks a different mechanism and would not confirm the required OSPF neighbor area mismatch outcome.

That result—Core routers learn the correct new prefix with an intended next hop and return traffic succeeds—concerns OSPF prefix advertisement omission. A healthy neighbor relationship does not imply every desired route is present; network statements, redistribution and policy can omit a prefix. It can be healthy even while the current OSPF neighbor area mismatch problem remains.

This would validate ACL deny versus service outage, not OSPF neighbor area mismatch. An ACL can block selected Layer 4 flows while other connectivity remains healthy; removing all controls is an unsafe shortcut. It is therefore insufficient acceptance evidence for the reported condition.

That result—A validated inventory identifies uplinks, upstream routes, address services, identity services and critical endpoint relationships—concerns inventory and dependency discovery. Missing uplink, power, VLAN, routing and identity dependencies cause apparently successful device replacements to disconnect applications or clients unexpectedly. It can be healthy even while the current poE budget planning problem remains.

This would validate dual-homed downstream aggregation, not poE budget planning. Hardware redundancy is ineffective if every downstream path still depends on one forwarding node or unsound Layer 2 topology. It is therefore insufficient acceptance evidence for the reported condition.

Real-time applications can fail with adequate average throughput when contention increases delay or jitter; requirement gathering must distinguish traffic classes. The indicated result—the requirements document includes per-application targets that can be checked in QoS and performance tests—checks a different mechanism and would not confirm the required poE budget planning outcome.