Datasheet

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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
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
01234567890
1
90
1
2
01
3
1
ECID = BUNDLE IDENTIFIER
EXP
0x102
2345678 92345678
Table 10-11. MEF Header Fields
Field Description
ECID The Emulated Circuit Identifier (ECID) field. Contains the bundle identifier.