classes and priorities. Routers understand the priority settings and handle them appropriately during
conditions of congestion.
Flow Label (20 bits)
The Flow Label field identifies packets requiring special treatment in order to manage real-time data traffic.
The sending router can label sequences of IPv6 packets so that forwarding routers can process packets within
the same flow without needing to reprocess each packet’s header separately.
NOTE: All packets in the flow must have the same source and destination addresses.
Payload Length (16 bits)
The Payload Length field specifies the packet payload. This is the length of the data following the IPv6 header.
IPv6 Payload Length only includes the data following the header, not the header itself.
The Payload Length limit of 2 bytes requires that the maximum packet payload be 64 KB. However, the
Jumbogram option type Extension header supports larger packet sizes when required.
Next Header (8 bits)
The Next Header field identifies the next header’s type. If an Extension header is used, this field contains the
type of Extension header (as shown in the following table). If the next header is a transmission control
protocol (TCP) or user datagram protocol (UDP) header, the value in this field is the same as for IPv4. The
Extension header is located between the IP header and the TCP or UDP header.
The following lists the Next Header field values.
Value Description
0 Hop-by-Hop option header
4 IPv4
6 TCP
8 Exterior Gateway Protocol (EGP)
41 IPv6
43 Routing header
44 Fragmentation header
50 Encrypted Security
51 Authentication header
59 No Next Header
60 Destinations option header
NOTE: This table is not a comprehensive list of Next Header field values. For a complete and current
listing, refer to the Internet Assigned Numbers Authority (IANA) web page at .
IPv6 Routing 521
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