Datasheet

____________________________________________________ DS34S101, DS34S102, DS34S104, DS34S108
Rev: 032609 41 of 198
Table 10-9. IPv6 Header Fields (UDP)
Field
Description
IPVER
IP version number, for IPv6 IPVER = 6
Traffic Class
An 8-bit field similar to the type of service (ToS) field in IPv4.
Flow Label
The 20-bit Flow Label field can be used to tag packets of a specific flow to differentiate the
packets at the network layer.
Payload Length
Similar to the Total Length field in IPv4. This field indicates the total length of the IP header and
data in octets.
Next Header
Similar to the Protocol field in IPv4. It determines the type of information following the basic IPv6
header. Must be set to 0x11 to signify UDP.
Hop Limit
Similar to the Time to Live field in IPv4.
Source IP Address
Similar to the Source Address field in IPv4, except that the field contains a 128-bit source address
for IPv6 instead of a 32-bit source address for IPv4.
Destination Address
Similar to the Destination Address field in IPv4, except that the field contains a 128-bit destination
address for IPv6 instead of a 32-bit destination address for IPv4.
10.6.1.4 MPLS Header
Figure 10-15. MPLS Header Format
0
0 1 2 3 4 5 6 7 8 9 0
1
9 0
1
2
01
3
1
OUTER LABELS (NONE, ONE OR TWO)
EXP
INNER LABEL = BUNDLE INDENTIFIER
S
TTL
EXP
S
TTL
2 3 4 5 6 7 8 92 3 4 5 6 7 8
Table 10-10. MPLS Header Fields
Field
Description
Outer Labels
MPLS labels, which identify the MPLS LSP, used to tunnel the TDMoMPLS packets through the
MPLS network. Also known as tunnel label(s) or transport label(s). The label number can be
assigned either manually or using the MPLS control protocol. There can be zero, one or two outer
labels.
EXP
Experimental field
S
Stacking bit: S=1 indicates stack bottom (i.e. the inner label). S=0 for all outer labels.
TTL
MPLS time to live
Inner Label
MPLS inner label (also known as the PW label or the interworking label) contains the bundle
identifier used to multiplex multiple bundles within the same tunnel. It is always be at the bottom of
the MPLS label stack, and hence its stacking bit is set (S=1).
10.6.1.5 MEF Header
Figure 10-16. MEF Header Format
0
0 1 2 3 4 5 6 7 8 9 0
1
9 0
1
2
01
3
1
ECID = BUNDLE IDENTIFIER
EXP
0x102
2 3 4 5 6 7 8 92 3 4 5 6 7 8
Table 10-11. MEF Header Fields
Field
Description
ECID
The Emulated Circuit Identifier (ECID) field. Contains the bundle identifier.