Schmid Watson Specifications download pdf (Page 29)

Watson-SHDSL-Router-Manual.doc

Version 1.1-07

Watson SHDSL Router

Operating Manual

Revision: 2012-02-15

3-9

3.4.1 Traffic Priority

Traffic Priority allows managing and avoiding traffic congestion by defining in-

bound and outbound priority rules. These rules determine the priority that pack-

ets, traveling through the router, will receive. QoS parameters (DSCP marking

and packet priority) are set per packet, on an application basis.

QoS parameters can be set using flexible rules, according to the following pa-

rameters:

 Source/destination IP address,

 MAC address or host name

 Source/destination ports

 VLAN ID (S-VLAN and/or C-VLAN)

 VLAN priority (802.1p)

 DSCP value

Two priority marking methods for packet prioritization are available:

 DSCP

 802.1p Priority

The matching of packets by rules is connection-based, known as Stateful Packet

Inspection (SPI), using the same connection-tracking mechanism used by the

firewall. Once a packet matches a rule, all subsequent packets with the same at-

tributes receive the same QoS parameters, both inbound and outbound.

3.4.2 Traffic Shaping

Traffic Shaping is the solution for managing and avoiding congestion where a

high speed LAN meets limited broadband bandwidth. A traffic shaper is essen-

tially a regulated queue that accepts uneven and/or bursty flows of packets and

transmits them in a steady, predictable stream so that the network is not over-

whelmed with traffic.

While Traffic Priority allows basic prioritization of packets, Traffic Shaping pro-

vides more sophisticated definitions. Such are:

 Bandwidth limit for each interface

 Bandwidth limit for classes of rules

 Prioritization policy

 TCP serialization

3.4.3 Differentiated Services Code Point (DSCP)

Differentiated Services (DiffServ) is a Class of Service (CoS) model that enhanc-

es best-effort Internet services by differentiating traffic by users, service require-

ments and other criteria. Packets are specifically marked, allowing network

nodes to provide different levels of service, as appropriate for voice calls, video

playback or other delay-sensitive applications, via priority queuing or bandwidth

allocation, or by choosing dedicated routes for specific traffic flows.

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