Datasheet

____________________________________________________ DS34S101, DS34S102, DS34S104, DS34S108
Rev: 032609 43 of 198
10.6.1.7 L2TPv3/IPv6 Header
Figure 10-18. L2TPv3/IPv6 Header Format
0
0 1 2 3 4 5 6 7 8 9 0
1
0
2
0
3
1
IPVER
TRAFFIC CLASS
FLOW LABEL
PAYLOAD LENGTH
NEXT HEADER
HOP LIMIT
IP
HEADER
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
SOURCE IP ADDRESS
DESTINATION IP ADDRESS
SESSION ID = BUNDLE IDENTIFIER
COOKIE 1 (OPTIONAL)
COOKIE 2 (OPTIONAL)
L2TPv3
HEADER
Table 10-14. IPv6 Header Fields (L2TPv3)
Field
Description
IPVER
See Table 10-9.
Traffic Class
Flow Label
Payload Length
Next Header
Must be set to 0x73 to signify LTPv3
Hop Limit
See Table 10-9.
Source Address
Destination Address
10.6.1.8 Control Word
Figure 10-19. Control Word Format
0
0 1 2 3 4 5 6 7 8 9 0
1
01
2
01
3
1
RES SEQUENCE NUMBERL R LENGTH
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
M FRG
Table 10-15. Control Word Fields
Field
Description
RES
Reserved bits.
Must be set to zero.
L
Local loss of sync failure.
This bit is set by CPU software (Port[n]_cfg_reg.Loss) for packets transmitted out the Ethernet port. A
set L bit indicates that the source has detected or has been informed of a TDM physical layer fault
impacting the data to be transmitted. This bit can be used to indicate physical layer LOS that should
trigger AIS generation at the far end. Once set, if the TDM fault is rectified, the L bit must be cleared.
R
Remote receive failure.
This bit is set by CPU software (Tx_R_bit field in bundle configuration) for packets transmitted out the
Ethernet port.. A set R bit indicates that the source is not receiving packets at the Ethernet port, i.e.,