ZyXEL MI-7248 User Guide - Page 141

VLAN Tag Format

Page 141 highlights

Chapter 26 VLAN Stacking 26.3 VLAN Tag Format A VLAN tag (service provider VLAN stacking or customer IEEE 802.1Q) consists of the following three fields. Table 44 VLAN Tag Format Type Priority VID 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. TPID (Tag Protocol Identifier) is the customer IEEE 802.1Q tag. • If the VLAN stacking port role is Access Port, then the switch adds the SP TPID tag to all incoming frames on the service provider's edge devices (1 and 2 in the VLAN stacking example figure). • If the VLAN stacking port role is Tunnel Port, then the switch only adds the SP TPID tag to all incoming frames on the service provider's edge devices (1 and 2 in the VLAN stacking example figure) that have an SP TPID different to the one configured on the switch. (If an incoming frame's SP TPID is the same as the one configured on the switch, then the switch will not add the 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 priority level of 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. 26.3.1 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. Configure the fields as circled in the switch VLAN Stacking screen. Table 45 Single and Double Tagged 802.1Q Frame Format DA SA Len/ Data FCS Untagged Etype Ethernet frame DA SA TPID Priority VID Len/ Data FCS IEEE 802.1Q Etype customer tagged frame DA SA SPTPID Priority VID TPID Priority VID Len/ Data FCS Double-tagged Etype frame Table 46 802.1Q Frame DA Destination Address SA Source Address Priority Len/ Etype 802.1p Priority Length and type of Ethernet frame MS-7206 User's Guide 141

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Chapter 26 VLAN Stacking
MS-7206 User’s Guide
141
26.3
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.
TPID
(Tag Protocol Identifier) is the customer IEEE 802.1Q tag.
If the VLAN stacking port role is
Access Port
, then the switch adds the
SP TPID
tag to all
incoming frames on the service provider's edge devices (1 and 2 in the VLAN stacking
example figure).
If the VLAN stacking port role is
Tunnel Port
, then the switch only adds the
SP TPID
tag
to all incoming frames on the service provider's edge devices (1 and 2 in the VLAN
stacking example figure) that have an
SP TPID
different to the one configured on the
switch. (If an incoming frame’s
SP TPID
is the same as the one configured on the switch,
then the switch will not add the 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 priority level of 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.
26.3.1
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.
Configure the fields as circled in the switch
VLAN Stacking
screen.
Table 44
VLAN Tag Format
Type
Priority
VID
Table 45
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
Table 46
802.1Q Frame
DA
Destination Address
Priority
802.1p Priority
SA
Source Address
Len/
Etype
Length and type of Ethernet frame