Vlan Tag Format; Frame Format; Figure 82 Vlan Stacking Example; Table 48 Vlan Tag Format - ZyXEL Communications MSC1000G User Manual

Figure 82 VLAN Stacking Example

10.8.4.1 VLAN Tag Format

A VLAN tag (service provider VLAN stacking or customer IEEE 802.1Q) consists of the
following three fields.

Table 48 VLAN Tag Format

Type
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. The system use 0x8100.
TPID (Tag Protocol Identifier) is the customer IEEE 802.1Q tag.
Priority refers to the IEEE 802.1p standard that allows the service provider to prioritize traffic
based on the class of service (CoS) the customer has paid for.
• On the switch, configure the priority level of the inner IEEE 802.1Q tag in the Port Setup
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.

10.8.4.2 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.
Chapter 10 DSL Port Setup Screens
Priority VID
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