VLAN & 802.1Q Trunking Analyzer
VLAN & 802.1Q Trunking Analyzer
Parse VLAN allowed lists, calculate tag overhead, and plan QinQ MTU impact.
VLAN Allowed List Parser
802.1Q Tag Overhead Calculator
QinQ / 802.1ad Double-Tag Planning
| Frame Type | Tag Bytes | EtherType | Fields Added |
|---|---|---|---|
| Untagged 802.3 | 0 | — | — |
| 802.1Q (dot1q) | +4 | 0x8100 | TPID (2) + TCI: PCP(3) + DEI(1) + VID(12) |
| QinQ / 802.1ad | +8 | 0x88A8 outer | Outer tag (4) + inner 802.1Q tag (4) |