小笔记:VLAN 范围 1-4096 ( vlan 0 和 VLAN 4095 用途 )
VLAN 4095
The reserved value 0x000 indicates that the frame does not carry a VLAN ID; in this case, the 802.1Q tag specifies only a priority (in PCP and DEI fields) and is referred to as a priority tag.
vlan 4095. In Nortel switches, VLAN 4095 is used by the CPU internally to desiginate an invalid VLAN.
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