Diffserv Qos Mode - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Ethernet IP Module Interface
Minimum Bandwidth – Minimum specification that allows a committed information rate (CIR)
to be applied to user-defined classes of traffic; otherwise, the default of no minimum bandwidth
can be selected.
Filtering – Any specific flow can be designated as filtered (see Maximum Bandwidth/Priority
QoS).
QoS Rule Hierarchy – The QoS Rule Hierarchy is the same as Maximum Bandwidth/Priority
QoS.
QoS Statistics – QoS Statistics are displayed as Maximum Bandwidth/Priority QoS.

13.4.5.3 DiffServ QoS Mode

The IP Module QoS can also be set to DiffServ Mode to make it fully compliant to the
Differential Services QoS RFC standards.
Class Selector DiffServ Code Points (DSCP) – Some implementations of DiffServ will
prioritize traffic by Class Selector assignment. This is defined in the DiffServ Code Points
(DSCP) within the IP header. The first three bits of the DSCP define the Class Selector
Precedence (or Priority):
The IP Module will prioritize the traffic based upon the DSCP Class Selector Precedence.
All traffic that does not have the DSCP Class Selector Precedence defined (000
000) will be placed in the Default Queue and have a Precedence of 9.
Expedited Forwarding and Assured Forwarding DSCP – Another implementation of DiffServ
uses all six bits of the DSCP to define Expedited and Assured Forwarding:
Expedited Forwarding
Assured Forwarding – Class 1
Assured Forwarding – Class 2
Assured Forwarding – Class 3
Assured Forwarding – Class 4
Class Selector DSCP IP Module Priority
Precedence 1 001 000
Precedence 2 010 000
Precedence 3 011 000
Precedence 4 100 000
Precedence 5 101 000
Precedence 6 110 000
Precedence 7 111 000
Default 000 000
DiffServ Type
7
6
5
4
3
2
1
9
Class Selector DSCP
Precedence 1 101 110
Precedence 8 001 xx0
Precedence 8 010 xx0
Precedence 8 011 xx0
Precedence 8 100 xx0
13–15
Revision 12
MN/CDM570L.IOM
IP Module Priority
3
7
7
7
7