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Configuring Your Gateway
45
SMCD3GN-RRR Wireless Cable Modem Gateway User Manual
To define CoS settings:
1. Check Enable QoS Class based on CoS.
2. For each class of service, assign a queue number from 0 to 3. Higher priority values are
evaluated as being of higher importance than lower priority values.
3. Under
Port Default CoS
, map the Gateway’s four ports to the classes of service you
defined in the previous step.
!
CoS setting from 0 to 3 = normal priority. Packets in this queue leave the port after the
high-priority queue is emptied.
!
CoS setting from 4 to 7 = high priority. Packets in this queue leave the port first.
4. Click
Apply
.
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The DSCP Based QoS menu lets you classify and prioritize traffic using DSCP tags. DSCP
allows the Gateway to determine how traffic classes should be prioritized. Using the DSCP
Based QoS menu, you can use DSCP to provide different levels of service to conforming
and non-conforming traffic by appropriately selecting the DSCP values in this menu. The
Gateway uses the Hierarchical Token Bucket queuing algorithm, which divides the 64
possible DSCP code values into 8 queues.
Table 7 shows the actual queuing.
Table 7. Queuing for DSCP-Based QoS
Name
Precedence
DSCP Range
Priority
Routing (default)
000 (0)
000000(0) – 000111 (7)
8
Priority
001 (1)
001000 (8) – 001111 (15)
7
Immediate
010 (2)
010000 (16) – 010111 (23)
6
Flash
011 (3)
011000 (24) – 011111 (31)
5
Flash Override
100 (4)
100000 (32) – 100111 (39)
4
Critical
101 (5)
101000 (40) – 101111 (47)
3
Internetwork Control
110 (6)
111000 (48) – 110111 (55)
2
Network Control
111 (7)
111000 (56) – 111111 (63
1
To access the DSCP Based QoS menu, click
QOS
in the menu bar and then click the
DSCP
submenu in the menu bar. Figure 25 shows an example of the menu.
Note:
The
DSCP
submenu is not available in the menu bar if
Enable QOS Module
is not
checked in the QoS Settings menu (see page 41).