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Routing policy must match the relevant address family as well as eligible source routes. That principle is related to OSPFv3 routing policy for external IPv6, not the main Filter-based VLAN rule precedence choice. Broad first-match conditions can eclipse later VLAN classification terms.

VSTP runs per-VLAN spanning-tree decisions rather than one shared instance. That principle is related to VSTP per-VLAN root distribution, not the main Filter-based VLAN rule precedence choice. Broad first-match conditions can eclipse later VLAN classification terms.

L2PT encapsulates selected customer Layer 2 control frames across a provider domain. That principle is related to L2PT customer BPDU tunneling, not the main Filter-based VLAN rule precedence choice. Broad first-match conditions can eclipse later VLAN classification terms.

Apply a deliberate trust boundary and separate PC and voice VLAN access policies. This belongs to Phone and PC shared switch-port security, not the specified IP phone first-hop diagnostic workflow operation. Power negotiation Layer 2 VLAN discovery and IP addressing are separate first-hop gates.

Verify supported PoE power classes and power negotiation for the specific phone model. This belongs to PoE class discovery and allocation, not the specified IP phone first-hop diagnostic workflow operation. Power negotiation Layer 2 VLAN discovery and IP addressing are separate first-hop gates.

Disable all VLAN separation and power policing network-wide to make one phone boot. This would not be an appropriate IP phone first-hop diagnostic workflow decision. Changing one DHCP option does not repair absent PoE or unsupported LLDP-MED.

Phone access-port design can carry tagged voice and untagged data for separate policies. That principle is related to Voice VLAN tagged versus PC data traffic, not the main VSTP interoperation and VLAN tagging choice. Different BPDU handling per VLAN can leave only some VLANs unprotected.

MSTP can group VLANs into instances with independent root bridge elections. That principle is related to MSTP instance root selection, not the main VSTP interoperation and VLAN tagging choice. Different BPDU handling per VLAN can leave only some VLANs unprotected.

IEEE 802.1Q tags distinguish VLAN traffic across a common trunk. That principle is related to 802.1Q trunk allowed VLANs, not the main VSTP interoperation and VLAN tagging choice. Different BPDU handling per VLAN can leave only some VLANs unprotected.

Captures and counters explain ingress class egress queue and final header marking. This validates CoS processing order ingress to egress but does not directly demonstrate the required CoS end-to-end verification of drop behavior result. Successful CoS needs consistent ingress classification egress scheduling and congestion management.

Routing control packets show stable service during expected congestion. This validates Network-control forwarding class differentiation but does not directly demonstrate the required CoS end-to-end verification of drop behavior result. Successful CoS needs consistent ingress classification egress scheduling and congestion management.

Isolated endpoints reach the intended shared gateway but not peer isolated ports. This validates Private VLAN isolated port separation but does not directly demonstrate the required CoS end-to-end verification of drop behavior result. Successful CoS needs consistent ingress classification egress scheduling and congestion management.

MSDP can exchange source-active awareness across ASM RP domains. This is a PIM join prune forwarding path failure pattern, not the primary MSDP source active exchange failure in this case.

MSDP can exchange source-active awareness across ASM RP domains. An unrestricted policy can carry sensitive multicast into unintended domains.

MSDP can exchange source-active awareness across ASM RP domains. This is a 802.1X EAP authentication credential validation failure pattern, not the primary MSDP source active exchange failure in this case.

Tune approved MST port costs and priorities based on the intended topology. This addresses MSTP root port and alternate path rather than the required BPDU protection on access edges decision. BPDU protection blocks unexpected spanning-tree participation at designated access edges.

Configure community secondary roles and the appropriate promiscuous uplink association. This addresses Private VLAN community and promiscuous roles rather than the required BPDU protection on access edges decision. BPDU protection blocks unexpected spanning-tree participation at designated access edges.

Enable BPDU protection on every core trunk without assessing spanning-tree adjacency. This is a risky or ineffective shortcut for BPDU protection on access edges. Enabling it on legitimate interswitch links can unnecessarily disable useful uplinks.

The handset receives voice VLAN policy and tags voice frames as intended. This validates LLDP-MED voice network policy but does not directly demonstrate the required PoE power budget switch capacity result. IEEE PoE total power budget and per-port allocation constrain powered endpoints.

Each participating VTEP has the required BUM flood destinations for the VNI. This validates EVPN Type3 IMET inclusive multicast routes but does not directly demonstrate the required PoE power budget switch capacity result. IEEE PoE total power budget and per-port allocation constrain powered endpoints.

Phones send frames with expected voice tags and priority values where supported. This validates LLDP-MED voice priority signaling but does not directly demonstrate the required PoE power budget switch capacity result. IEEE PoE total power budget and per-port allocation constrain powered endpoints.

Receivers join the intended group and packets retain a valid unicast source. This validates IPv4 multicast group address versus unicast but does not directly demonstrate the required LLDP neighbor advertisement result. LLDP provides Layer 2 neighbor discovery independent of IP routing.

Phones send frames with expected voice tags and priority values where supported. This validates LLDP-MED voice priority signaling but does not directly demonstrate the required LLDP neighbor advertisement result. LLDP provides Layer 2 neighbor discovery independent of IP routing.

Negotiated power class and delivered wattage match the handset requirement. This validates PoE class discovery and allocation but does not directly demonstrate the required LLDP neighbor advertisement result. LLDP provides Layer 2 neighbor discovery independent of IP routing.

Expected adjacency relationships achieve correct state for the selected network type. This validates OSPF neighbor state troubleshooting workflow but does not directly demonstrate the required OSPF stub area external LSA suppression result. OSPF stub areas restrict external AS-external advertisements and require compatible area flags.

The intended eligible DR and BDR appear on the broadcast segment after reelection. This validates OSPF designated router election broadcast LAN but does not directly demonstrate the required OSPF stub area external LSA suppression result. OSPF stub areas restrict external AS-external advertisements and require compatible area flags.

Remote peers recognize Ethernet segment participation and respond to advertised withdrawals. This validates EVPN Type1 Ethernet auto discovery but does not directly demonstrate the required OSPF stub area external LSA suppression result. OSPF stub areas restrict external AS-external advertisements and require compatible area flags.

The preferred external route follows correct E1 total metric or E2 selection rules. This validates OSPF external type-one versus type-two metrics but does not directly demonstrate the required BGP multipath equal-cost path installation result. BGP multipath requires compatible path properties and FIB programming beyond two received advertisements.

The BGP route becomes active after recursive next-hop resolution succeeds. This validates BGP next-hop reachability hidden route but does not directly demonstrate the required BGP multipath equal-cost path installation result. BGP multipath requires compatible path properties and FIB programming beyond two received advertisements.

The active route reflects documented policy and any hidden route has an explained reason. This validates BGP hidden and rejected path diagnosis but does not directly demonstrate the required BGP multipath equal-cost path installation result. BGP multipath requires compatible path properties and FIB programming beyond two received advertisements.

Inspect interface ethernet-switching configuration and VLAN counters on both ends. That check applies chiefly to 802.1Q trunk allowed VLANs, not the current Ethernet MAC learning and flooding issue. Ethernet switches learn source MACs per VLAN and flood unknown destinations until learned.

Configure an OSPF route filter to stop Layer 2 unknown-unicast flooding. That bypass leaves the Ethernet MAC learning and flooding issue unresolved. A loop can cause rapid MAC movement and high broadcast utilization.

Inspect ingress and egress double-tag format and switch VLAN translation state. That check applies chiefly to QinQ service VLAN outer tag, not the current Ethernet MAC learning and flooding issue. Ethernet switches learn source MACs per VLAN and flood unknown destinations until learned.