IP Router Configuration
7705 SAR OS Router Configuration Guide 29
IPv6 Headers
The IPv6 header format is shown in Figure 1. Table 2 describes the fields.
Figure 1: IPv6 Header Format
Table 2: IPv6 Header Field Descriptions
Field Description
Version 4-bit IP version number (v6)
Traffic Class 8-bit value that enables a source to identify the
delivery classification of its packets
Flow Label 20-bit flow label that can be used by a source to
label packets for which the source requests special
handling by IPv6 routers; for example, non-default
QoS or real-time service
A flow contains a series of packets that travel
between a particular source and particular
destination
Payload Length The length of the payload (16-bit unsigned
integer), which is the rest of the packet following
the IPv6 header, in octets
Any extension headers that are present in the
packet are considered to be part of the payload;
therefore, the payload always begins immediately
after the Destination Address
21169
Version Traffic Class Flow Label
Source Address
Destination Address
Payload Length Next Header Hop Limit
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