Comtech EF Data MDX420 SkyWire Manual - Manual (Page 116)

MDX420 SkyWire™ Satellite Network Gateway SkyWire QoS
MN-MDX420 Revision 6 C–6
C.3 Programmable Ingress Policies
SkyWire provides the network administrator with the following QOS settings that control how the
incoming data is routed to the four prioritized queues.
C.3.1 Normal QOS
When Normal QOS is selected, the determination of traffic priority and queuing is based on
information contained in the Ethernet packet as follows:
When a packet contains an IEEE802.3ac Tag (this tag is optional), SkyWire uses the IEEE802.1p
priority information embedded in the Tag.
When a packet does not contain the optional Tag, priority is determined using the
IPv4 Type of Service / Differentiated Service field
or
IPv6 Traffic Class field
C.3.2 Port Based QOS
When Port Based QOS is selected, SkyWire ignores and QOS information embedded in the
headers and instead priority and queuing is based on the port on which the traffic arrives.
Ethernet packets arriving on Data Port J3 have the highest priority and those arriving on Data
Port J4 have the lowest. This type of QOS is typically used when the operator wants to control
bandwidth allocation based upon the data ports.
Port Based QOS can also be used to create a FIFO like operation where the data is transmitted
in the exact order it is received. This can be extremely useful when traffic shaping equipment or
crypto devices are used with SkyWire. In these cases, only one of the data ports (J3 or J4) would
be utilized.