Zyxel IES-5112 [214/1156] 3 vlan tag format

Zyxel IES-5112 [214/1156] 3 vlan tag format
Chapter 10 Subscriber Port Setup Screens
Management Switch Card User’s Guide
214
Figure 131 VLAN Stacking Example
10.2.13.1 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. 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.
10.2.13.2 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.
Configure the fields as circled in the switch VLAN Stacking screen.
Table 95 VLAN Tag Format
Type Priority VID
Table 96 Single and Double Tagged 802.1Q 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

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