Appendix
E Encapsulation over PSN
Installation and Operation Manual
E-8
2BEncapsulation over Different PSN Types
ACE-3105, ACE-3205 Ver. 5.2
Parameter Name
Purpose
Type 8100
If VLAN support is enabled, the Ethernet
packet type is set to 0x8100 . 2 bytes long.
VLAN tag
If VLAN support is enabled, this tag includes
the VLAN ID and its priority; configured per
PW. 2 bytes long.
Type 800
IP packet type – 0x800. 2 bytes long.
IP header
The protocol field of the IPv4 header is set
to 17 (UDP). 20 bytes long.
UDP header
8 bytes long; contains the details of:
•
UDP source port – identifies the PW label
of the destination unit
•
UDP destination Port – uses TDMoIP
protocol number: 0x85E (2142)
Control Word
Contains the sequence number and control
bits. 4 bytes long.
Payload
The service data carried on the frame,
depending on the PW type.
PPPoE Packet Format
A PPPoE encapsulation can be either of the following two formats:
DA
SA
Type
8864
PPPoE
header
PPP
header
IP
header
UDP
header
Control
Word
Payload
Figure
E-10. PPPoE Encapsulation Format – with UDP Header
DA
SA
Type
8864
PPPoE
header
PPP
header
IP
header
PW label
Control
Word
Payload
Figure
E-11. PPPoE Encapsulation Format –with MPLS in IP
Table
E-9. PPPoE Encapsulation Parameters
Parameter Name
Purpose
DA
Destination MAC address of the access
concentrator which was learned in the
PPPoE session. 6 bytes long.
SA
MAC address of the device. 6 bytes long.
Type 8864
Ethernet packet type is set to 0x8864,
which indicates that it is a PPPoE data
frame. 2 bytes long.
PPPoE header
Contains the PPPoE session ID. 6 bytes long.
Optional
