Marking packets with ToS/DSCP values
Users may want to mark certain packets with a ToS/DSCPDifferentiated Services Code Point value so that external routers can treat the traffic appropriately. The same policy configuration screen above (see Figure 1) allows users to configure such an action.
When the policy action is set to ‘Optimize’, several options are available on the right-hand side, one of which is the ‘ToS/DSCP Mark’ checkbox. Users will need to enable this feature by checking the box and selecting the appropriate ToS/DSCP mark from the drop down.
Any traffic that matches the corresponding filter rules is then marked with the specified value and should be treated appropriately by routing equipment down the line.
EXAMPLE
Service Providers may provide users with a table similar to the one below (example only). Each class has different guaranteed service and pricing levels. This information should be used in conjunction with optimizer policies to implement and ensure quality of service. See Table 1 to convert the DSCP Settings to a decimal value that can be used in the Optimizer Policies.
| Traffic Priority Class | IETF DiffServ Traffic Priority Class | DSCP Setting |
|---|---|---|
|
Real Time (Gold) |
Expedited Forwarding |
EF |
|
Mission Critical (Silver High) |
Assured Forwarding |
AF31 |
|
Business Critical (Silver Low) |
Assured Forwarding |
AF32/33 |
|
General Business (Bronze) |
Best Effort |
BE |