ZyXEL Communications OMC-2301, User Manual

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Chapter 8 VLAN Profile
OMC-2301 User’s Guide
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Figure 27 VLAN Stacking Example
8.3 VLAN Tag Format
A VLAN tag (service provider VLAN stacking or customer IEEE 802.1Q) consists of the
following three fields.
Type is a standard Ethernet type code identifying the frame and indicates that whether the
frame carries IEEE 802.1Q tag information. SP TPID (Service Provider Tag Protocol
Identifier) is the service provider VLAN stacking tag type. Many vendors use 0x8100 or
0x9100.
Priority refers to the IEEE 802.1p standard that allows service providers to prioritize traffic
based on the class of service (CoS) the customer has paid for.
• On the OMC, configure priority level on inner IEEE 802.1Q in the VLAN Profile screen.
• "0" is the lowest priority level and "7" is the highest.
VID is the VLAN ID. SP VID is the VID for the second (service provider’s) VLAN tag.
8.3.1 Frame Format
The frame format for an untagged Ethernet frame, a single-tagged 802.1Q frame (customer)
and a “double-tagged” 802.1Q frame (service provider) is shown next.
Table 20 VLAN Tag Format
Type Priority VID
Table 21 Single and Double Tagged 802.11Q Frame Format
DA SA Len/
Etype
Data FCS Untagged
Ethernet frame
DA SA TPID Priority VID Len/
Etype
Data FCS IEEE 802.1Q
customer
tagged frame
DA SA SPTPID Priority VID TPID Priority VID Len/
Etype
Data FCS Double-tagged
frame