Technical information

Watson-SHDSL-Router-GUI-Manual.doc
Version 2.3-03
Watson SHDSL Router
Web-based Management Manual
Revision: 2012-02-29
8-51
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.
Diffserv defines a field in IP packet headers referred to as DSCP. Hosts or routers
passing traffic to a Diffserv-enabled network will typically mark each transmitted
packet with an appropriate DSCP. The DSCP markings are used by Diffserv net-
work routers to appropriately classify packets and to apply particular queue han-
dling or scheduling behavior. Watson provides a table of predefined DSCP values,
which are mapped to 802.1p priority marking method (refer to Section 8.3.6).
You can edit or delete any of the existing DSCP setting, as well as add new entries.
1. Under the QoS menu item, click 'DSCP Settings'. The following screen appears.
Figure 8-55: DSCP–Traffic Priority Matching
Each DSCP value is assigned a default queue number as a part of its 802.1p priori-
ty settings. Watson's QoS supports up to eight Priorities which are mapped to
low/medium/high priority queues, where Queue 0 has the lowest priority.
2. To edit an existing entry, click its action icon . To add a new entry, click the
'New Entry' link. In both cases, the 'Edit DSCP Settings' screen appears.