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Chapter 5: Setting Up and Configuring the Router
QoS Tab - QoS Setup
4-Port SSL/IPSec VPN Router
QoS Tab - QoS Setup
The
QoS Setup
screen lets you enable QoS and configure Trust Mode and Class of Service (CoS) settings.
QoS Setup
QoS Mode
QoS Mode. Select the appropriate mode,
Disable
or
Basic
. The default is
Disable
, which indicates no priority. If
the Basic mode is selected, the Router will apply the settings configured on the
QoS Setup
,
Queue Settings
, and
DSCP Settings
screens.
Trust Mode Default CoS
Configure the Trust Mode and Default CoS priority values for each LAN port.
Port ID. The ID numbers of the Router’s four LAN ports are displayed in this column.
Trust Mode. Select the appropriate mode:
None
,
CoS
, or
DSCP
. The default is
None
.
None. If the None option is selected, then the Router prioritizes each packet based on the required level of
service for its four LAN ports, using four priority queues with strict or Weighted Round Robin (WWR) queuing.
You can use these functions to assign independent priorities for delay-sensitive data and best-effort data.
When a port is set to None mode, then the Router will not check CoS VLAN tag priority or DSCP/ToS priority
bits in the IP header.
CoS. If the CoS option is selected, then the Router will use CoS-based QoS in Layer 2. This type of QoS lets you
specify which data packets have higher priority when traffic is buffered due to congestion. Data packets in
high priority queues will be transmitted before those in the lower priority queues. You can map eight priority
levels to the Router’s input queues. If the port is configured as CoS mode, then the order of importance for the
application of priority rules are as follows: 1) CoS, 2) DSCP, and 3) None (port-based priority).
DSCP. If the Differentiated Services Code Point (DSCP) option is selected, then the Router will use DSCP-based
QoS in Layer 3. Traffic priorities can be specified in the IP header of a frame. With DSCP-based QoS, the
Router can use the priority bits in the Type of Service (ToS) octet to prioritize traffic. If priority bits are used,
the ToS octet may contain three bits for IP Precedence or six bits for DSCP service. If the port is configured as
DSCP mode, then the order of importance for the application of priority rules are as follows: 1) DSCP, 2) CoS,
and 3) None (port-based priority).
Default CoS. Select the default CoS priority value, 0 to 7, with 0 being the lowest priority.
Figure 5-45: QoS Tab - QoS Setup
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