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Configuring Ethernet, FDDI, and Token Ring Services

5-6

305259-A Rev 00

802.1Q Tagging

802.1Q tagging enables multiple VLANs to share a common connection to a

router. The router provides layer 3 routing services for the VLAN clients. The

router may provide standard routing services, that is, directing received frames

toward a remote destination; or it may function as a so-called “one-armed” router,

returning frames to the device from which it received them, but forwarding them

to a different logical entity.

Shared usage of a common physical port (often referred to as a tagged port) is

facilitated by the addition of two 2-byte fields within the standard Ethernet header

(Figure 5-4

Figure 5-4. IEEE 802.1Q Tagging

Destination address

(6 octets)

Source address

(6 octets)

Protocol type

(2 octets)

Data

(46 to 1496 octets)

FCS

(4 octets)

Destination address

(6 octets)

Source address

(6 octets)

Protocol type

(2 octets)

Tag protocol identifier

(2 octets)

Tag control information

(2 octets)

Data

(46 to 1496 octets)

FCS

(4 octets)

SN0016A

Ethernet encapsulation

Maximum size: 1514 octets

Maximum size: 1518 octets

IEEE 802.1Q encapsulation

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 135 136

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