Appendix
E Encapsulation over PSN
Installation and Operation Manual
E-6
2BEncapsulation over Different PSN Types
ACE-3105, ACE-3205 Ver. 5.2
Parameter Name
Purpose
Tunnel label
Label of the PW tunnel between
ACE-3105, ACE-3205 and the PE. This
parameter is manually configured per
PW/peer and per direction, or dynamically
learned using LDP. 4 bytes long.
A different value is possible for the RX and
TX directions (tunnel in/out).
PW label
Label of the Pseudowire; manually defined
per PW and per direction, or dynamically
learned using LDP. 4 bytes long.
Control Word
Contains the sequence number and control
bits. Optional for some PW types. 4 bytes
long.
Payload
The service data carried on the frame,
depending on the PW type.
PHP Enabled – Control Packet
DA
SA
Type
8100
VLAN
tag
Type
800
IP header
UDP
LDP
Figure
E-7. MPLS Control Packet when PHP is Enabled
Table
E-6. Encapsulation Parameters
Parameter Name
Purpose
DA
Destination MAC address of the remote
peer or next hop unit. 6 bytes long.
SA
MAC address of the device. 6 bytes long.
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
MPLS packet type – 0x800. 2 bytes long.
IP header
The protocol field of the IPv4 header is set
to 17 (UDP). 20 bytes long.
UDP
UDP bytes
LDP LDP
bytes
Optional