Configure QoS Elements on Concerto

Configure QoS Classification Elements

You use QoS classification elements to categorize all ingress traffic packets based on their importance and to place related packets into their own forwarding class. You can also configure the loss priority and rate limits for each classification, and you can rewrite the Differentiated Services Code Point (DSCP) and 802.1p bits in the packet headers.

To configure a QoS classification element:

1. Go to Configure > Profile Elements > Elements > QoS > Classification.
   
   
   
   The QoS Classification screen displays.
   
   
    
2. Click + Classification to create a new Classification element. In the Create Classification screen, enter information for the following fields.
   
   
    

   Field	Description
   Name	Enter a name for the classification.
   Forwarding Class (Group of Fields)
   Category	Select the category: Assured Best Effort Expedited Network Control
   Class	Select the forwarding class to apply to the classification: Forwarding Class 0 through Forwarding Class 3 (for the Network Control category) Forwarding Class 4 through Forwarding Class 7 (for the Expedited category) Forwarding Class 8 through Forwarding Class 11 (for the Assured category) Forwarding Class 12 through Forwarding Class 15 (for the Best Effort category)
   DSCP Rewrite	Click to enable the rewriting of the DSCP bits in the headers of outbound traffic.
   802.1P Rewrite	Click to enable rewriting of the 802.1P bits in the headers of outbound traffic.
   Advanced (Group of Fields)
   Loss Priority	Select the loss priority: High Low
   Rate Limit	Select the type of rate limited: Peak Burst Size—Enter the peak burst size, in bytes. Peak Rate—Enter the peak rate, in kbps

3. Select the Permissions tab, or click Next.
4. Update the permissions, if desired, and then click Save.

Configure QoS Traffic-Class Schedulers

You can configure traffic-class schedulers to assign different types of traffic to different outbound queues, which associate drop profiles with a high and a low drop-low priority. Schedulers are grouped into a scheduler map, which assigns the schedulers to a traffic class.

To configure a QoS traffic class scheduler:

1. Go to Configure > Profile Elements > Elements > QoS > Traffic Class Scheduler.
   
   
   
   The QoS Traffic Class Scheduler screen displays.
   
   
    
2. Click + Traffic Class Scheduler to create a new traffic class scheduler. The Create Traffic Class Scheduler screen displays.
   
   
    
3. Select the General tab.
4. Enter a name for the traffic class scheduler.
5. Click Add Rate Type, and then select a rate type, which can be Guaranteed Rate or Transmit Rate.
   
   
    
6. Enter a value in the field to the right of Type, and then select the units, either percentage (%) or Kbps.
7. Click Advanced.
   
   
    
8. For each queue, select a weight value. The value can be 1 through 16.
9. Select the Permissions tab, or click Next.
10. Update the permissions, if desired, and then click Save.

Configure QoS Rewrite Rules

You configure rewrite rules to remark, or change, bits in the header of outgoing packets. A rewrite rule examines a packet's forwarding class and loss priority and sets the CoS bits to the value defined in the rule. Rewrite rules apply the packet loss priority and forwarding class information to determine the DSCP on outbound packets or streams.

In Concerto Releases 10.2.1 and later, you can configure QoS rewrite rules and make them eusable profile elements. Once you create rewrite rules, you can use them in any Interface policy under Configure Profiles > Profile Elements > >Policy Elements > Device > Interface.To configure QoS rewrite rules:

1. Go to Configure > Profile Elements > Elements > QoS > Rewrite Rule.
   
   
   
   The QoS Rewrite Rule screen displays.
   
   
    
2. Click + Rewrite Rule to create a new rewrite rule. In the Create Rewrite Rule screen, enter information for the following fields.
   
   
    

   Field	Description
   Name	Enter a name for the rewrite rule.
   Type	Select the rewrite table type: DSCP DSCPv6 IEEE 802.1p
   Category	Select the category: Assured Best Effort Expedited Network Control
   Forwarding Class	Select the forwarding class to which to apply the rewrite rule. Certain forwarding classes are available for each category: Forwarding Class 0 through Forwarding Class 3 (for the Network Control category) Forwarding Class 4 through Forwarding Class 7 (for the Expedited category) Forwarding Class 8 through Forwarding Class 11 (for the Assured category) Forwarding Class 12 through Forwarding Class 15 (for the Best Effort category)
   Loss Priority	Select the drop loss priority at which the DSCP, DSCPv6, or IEEE 802.1p value should be rewritten: Low High
   Code Point	Select the standard code point to associate with the forwarding class and the drop loss priority.
   Add Forwarding Class	Click to add another forwarding class, if desired.
   Add Type	Click to add another type, if desired.

3. Select the Permissions tab, and edit the permissions if desired.
4. Click Save to create the reusable rewrite rule.

Configure QoS Interface Schedulers

You can use QoS interface schedulers to assign traffic class schedulers to QoS forwarding class categories.

To configure a QoS interface scheduler:

1. Go to Configure > Profile Elements > Elements > QoS > Interface Schedulers.
   
   
   
   The QoS Interface Scheduler screen displays.
   
   
    
2. Click + Profile to add a new interface scheduler. The Create Interface Scheduler screen displays.
   
   
    
3. Enter a name for the new interface scheduler.
4. For each category, select an option from the drop-down list on the right. The options are TC1, TC-2, and TC-BE.
5. Select the Permissions tab or click Next.
6. Update the permissions, if desired, and then click Save.

Supported Software Information

Releases 10.2.1 and later support all content described in this article, except:

• Release 12.1.1 allows you to apply a QoS rewrite rule to all SD-LAN overlay tunnels.

Additional Information

Configure Profiles