Comtech EF Data MDX420 SkyWire Manual - Manual (Page 115)

MDX420 SkyWire™ Satellite Network Gateway SkyWire QoS
MN-MDX420 Revision 6 C–5
C.2.4 IPv6 Traffic Class (RFC 2460)
When a packet doesn't contain an IEEE tag, and it's an IPv6 frame, SkyWire uses the information
contained in the Traffic Class field to determine the appropriate queue. The Traffic Class field is
contained in the 1st and 2nd bytes of the IPv6 header and supports 64 priority levels with 63
being the highest and 0 being the lowest. The following diagrams illustrate the format of the IPv6
Traffic Class field and the mapping of the various priorities the available queues.
IPv6 Traffic Class Field
Traffic Class
2 bits
IP Version
4 bits
Traffic Class
4 bits
Reserved
2 bits
Flow Label
4 bits
Network Queue
Priorities 48 - 63
Critical Queue
Priorities 32 - 47
Immediate Queue
Priorities 16 - 31
Routine Queue
Priorities 0 - 15
Queue
Manager
Packets In Packets Out
IPv6 Traffic Class Flow