Figure 4-9 Tci Structure Of The C-Tag; Figure 4-10 Tci Structure Of The S-Tag - Huawei OptiX OSN 550 Configuration Manual

4 Configuring Ethernet Services
Tag Type
S-VLAN Tag
NOTE
l
The TCI structure of the S-TAG is basically the same as the TCI structure of the C-TAG. VLAN
ID (VID) field consists of 12 bits and ranges from 0 to 4095. The difference is that the TCI of
the S-TAG contains the drop eligible (DE) indication and works with the priority code point
(PCP) to indicate the priority of the S-TAG frame.
The TCI structures of the C-TAG and S-TAG are shown in

Figure 4-9 TCI structure of the C-TAG

Octets:
Bits:
The TCI field of the C-TAG consists of the following bytes:
l
l

Figure 4-10 TCI structure of the S-TAG

Octets:
Bits:
The TCI field of the S-TAG consists of the following bytes:
l
l
l
4-10
The IEEE 802.1ad specifies the TPID of the S-VLAN to 0x88a8. In actual application, the setting of TPID
for the S-VLAN tag varies according to the equipment manufacturer. To ensure compatibility between
interconnected equipment, it is recommended that you set the TPIDs of the S-VLAN tags of the
interconnected equipment to the same value within 0X600-FFFF.
TCI structure
1
PCP CFI
8 6 5
PCP: three bits
CFI: one bit
1
PCP DE
8 6 5
PCP: three bits
DE: one bit
VID: 12 bits
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
OptiX OSN 550 Multi-Service CPE Optical Transmission
Name
802.1q Service Tag Type
2
VID
4 1 8
2
VID
4 1 8
Configuration Guide
Value
Customizable
Figure 4-9 and Figure 4-10.
VID
1
VID
1
Issue 02 (2011-06-30)
System