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Watson SHDSL Router

Operating Manual

Watson-SHDSL-Router-Manual.doc

Version 1.1-07

3-10 Revision: 2012-02-15

DiffServ defines a field in IP packet headers referred to as DSCP. Hosts or rout-

ers passing traffic to a DiffServ-enabled network will typically mark each transmit-

ted packet with an appropriate DSCP. The DSCP markings are used by DiffServ

network routers to appropriately classify packets and to apply particular queue

handling or scheduling behavior.

Watson SHDSL router provides a configurable table of predefined DSCP values,

which are mapped to 802.1p priority marking method.

3.4.4 IEEE 802.1p priority

The IEEE 802.1p priority marking method is a standard for prioritizing network

traffic at the data link/Mac sub-layer. 802.1p traffic is simply classified and sent to

the destination, with no bandwidth reservations established.

The 802.1p header includes a 3-bit prioritization field, which allows packets to be

grouped into eight levels of priority. Watson SHDSL router maps these eight lev-

els to three main priorities: high, medium and low. By default, values six and

seven are mapped to high priority, which may be assigned to network-critical traf-

fic. Values four and five are mapped to medium priority, which may be applied to

delay-sensitive applications, such as interactive video and voice. Values three to

zero are mapped to low priority, which may range from controlled-load applica-

tions down to "loss eligible" traffic. The zero value is normally used for best-effort

traffic. It is the default value for traffic with unassigned priority.

3.4.5 DSCP Remark According to 802.1p CoS

When creating a VLAN interface over a LAN connection, it is possible to deter-

mine the IP header's Differentiated Services Code Point (DSCP) priority value

according to the VLAN header's 802.1p Class of Service (CoS) tag. The DSCP

value can then be used for Quality of Service (QoS) traffic prioritization.

3.4.6 Class Statistics

Watson SHDSL router provides accurate, real-time information on the traffic

moving through the defined device classes. For example, the amount of packets

sent, dropped or delayed, are just a few of the parameters that can be monitored

per each shaping class.

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Schmid Watson Specifications Page 30