WAGO 852-1305 Manual page 73

WAGO-ETHERNET-Zubehör 852
852-1305 8/4-Port 100BASE-T/1000BASE-SX/LX
Double Tagging Format
A VLAN tag (service provider "VLAN Stacking" or customer IEEE 802.1Q)
consists of the following three fields:
TPID
TPID
TPID ("Tag Protocol Identifier") is a standard ETHERNET code identifying the
frame and indicating whether the frame contains IEEE 802.1Q tag information.
The value of this field is 0x8100 as described in IEEE 802.1Q. Other providers
may use a different value, such as 0x9100.
"Tunnel TPID" is the "VLAN Stacking" tag type the switch adds to the outgoing
frames sent through a "Tunnel Port" of the service provider's PE devices
Priority
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. "0"
is the lowest priority level and "7" is the highest.
VID
VID ("VLAN ID"). SP VID is the VID for the second or outer VLAN tag (of the
service provider). CVID is the VID for the first or inner VLAN tag (of the
customer).
The frame formats for an untagged "ETHERNET Frame" a single-tagged 802.1Q
frame (customer) and a double-tagged 802.1Q frame (service provider) are shown
as follows.
Untagged frame DA
Single-tagged
frame
Double-tagged
frame
DA
SA
Tunnel TPID
VID
Len or Etype
Data
FCS
Manual
1.1.0
Priority
Len or Data
Etype
DA SA TPID P
DA SA Tunnel P
TPID
Destination Address
Source Address
"Tag Protocol Identifier" added to a "Tunnel Port"
VLAN ID
Length or ETHERNET frame type
Frame data
Frame Check Sequence
Enhanced Features
VID
FCS
VID Len Data FCS
or
Etype
VID TPID P VID
73
Len or Data FCS
Etype