D-Link DGS-1510-28XMP/ME [72/342] 1 2 3 4

D-Link DGS-1510-28XMP/ME [72/342] 1 2 3 4
DGS-1510/ME Series Metro Ethernet Switch Web UI Reference Guide
63
0 1
2 3 4
Destination Address (6 octets)
Source Address (6 octets)
EtherType=0x8100
MAC Length/Type Beginning of Data
Cyclic Redundancy Check (4 octets)
User Prlorlty CFI VLAN ID (VID) (12 bits)
Tag Control Information
Figure 4-2 IEEE 802.1Q Tag
The EtherType and VLAN ID are inserted after the MAC source address, but before the original EtherType/Length or
Logical Link Control. Because the packet is now a bit longer than it was originally, the Cyclic Redundancy Check
(CRC) must be recalculated.
Dst. MAC Src. MAC
Dst. MAC Src. MAC
Tag Control Information (TCI)
4
Up to 15006
16 3 1 12
6 2 4
Up to 15006 6 2 4
Original Ethernet Packet
New Tagged Packet
bytes
bytes
bites
Figure 4-3 Adding an IEEE 802.1Q Tag
Port VLAN ID

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