Alcatel-Lucent 1643 AMS Applications And Planning Manual page 216

Ethernet Overview
IEEE 802.1Q VLAN tagging mode
Destination address
Source address
VLAN tag (C-tag)
Legend:
TPID
UP (3 bits)
CFI (1 bit)
....................................................................................................................................................................................................................................
11-40
Length/Type
Payload
FCS
2
UP
2
C-tag
C-CFI
Tag protocol identifier ("Ethertype") - indicates the presence of
a VLAN tag (or CID tag, respectively). Furthermore, it
indicates that the length/type field can be found at a different
position in the frame (moved by 4 bytes).
User priority - "0" (low priority) { "7" (high priority).
Canonical Format Identifier - indicates the presence or absence
of routing information.
Alcatel-Lucent - Proprietary
IEEE 802.1ad VLAN tagging mode
6
6
4
2
46 - 1500
4
TPID
CFI VID
(V ... V )
8
VID
(V ... V )
1 7
See notice on first page
VPN tagging mode /
Destination address
Source address
CID-tag (S-tag)
VLAN tag (C-tag)
Length/Type
Payload
FCS
11
S-tag
S-CFI
Tagging modes
6
6
4
4
2
46 - 1500
4
365-312-801R7.2
Issue 3, May 2007