Zte zxmsg 5200 Technical Manual page 53

F
I G U R E
VLAN ID and VLAN ID and PVID description:
PVID
VLAN Based ZXMSG 5200 supports the following VLAN features:
Functions
Control Information (TCI). The TPID indicates a tag header.
The TCI includes subscriber priority, Canonical Format
Indicator (CFI) and VLAN ID. The 3-bit subscriber priority is
in a scale of 8, where 0 is the lowest and 7 the highest. The
CFI bit indicates whether the MAC address in the MAC data
field is a standard format, where CFI=0 indicates standard
format, while CFI=1 indicates non-standard formats. The VID
field indicates the VLAN ID to which the frame belongs, and
has a maximum number of 4095.
1 7 – T H
A G E A D E R
TPID(Tag Protocol Identifier)
Priority CFI
VID
VLAN ID:
Indicates the VLAN identifier, such as VLAN 1 and VLAN 2.
PVID:
Indicates the default port's VLAN ID. When the received
frame is tagged, the PVID does not take effect because the
VLAN ID is contained in the tag. When the received frame is
not tagged, the PVID takes effect and is used as VLAN ID.
Therefore, when the received frame is not tagged, PVID is
configured in VLAN port configuration.
VLAN based on IEEE 802.1Q:
The IEEE 802.1Q standards define an operation called
tagging, that binds a 4-byte tag domain to destination and
source addresses of an Ethernet frame. This tag domain
includes a VLAN identity called VLAN ID. 'VLAN based on
IEEE 802.1Q' means distinguishing between VLANs according
to the VLAN ID marked in an Ethernet frame and is generally
used when there are multiple VLANs cross multiple devices.
ZXMSG 5200 system supports identification of tagged
messages and tagging of non-tagged messages. Figure 18
shows the tag 802.1Q identification method.
Confidential and Proprietary Information of ZTE CORPORATION
F
O R M A T
Two-byte TPID
VID
Two-byte TCI
Chapter 3 Service Functions
41