JUNOSe 9.1.x Quality of Service Configuration Guide > Configuring Compound Shared Shaping of Traffic > Example: Compound Shared Shaping for ATM VCs

Example: Compound Shared Shaping for ATM VCs

Figure 27 illustrates a typical DSL triple-play configuration, involving voice, video, and data traffic. In this example, a total of 1 Mbps of bandwidth is allocated to voice, video, and best-effort data traffic associated with the VC 1 logical interface.

The voice queue in the EF traffic-class group for VC 1 is a strict constituent that has first claim on up to 200 Kbps of the shared bandwidth. The video queue in the AF traffic-class group is a strict constituent that can claim up to 300 Kbps of the remaining 800–1000 Kbps of shared bandwidth. The best-effort queue for logical interface VC 1 is a strict constituent that has the last claim to the remaining 500–1000 Kbps of shared bandwidth.

Figure 27: VC Compound Shared Shaping Example

To configure VC compound shared shaping:

1. Configure the traffic classes, traffic-class groups, and additional scheduler profiles.
2. Configure the scheduler profile that defines the shared shaper and the profiles that apply the legacy shaper.

host1(config)#scheduler-profile shared-1Mbps

host1(config-scheduler-profile)#shared-shaping-rate 1000000 burst 32768 auto

host1(config)#scheduler-profile 300Kbps

host1(config-scheduler-profile)#shaping-rate 300000

host1(config)#scheduler-profile 200Kbps

host1(config-scheduler-profile)#shaping-rate 200000

3. Configure the QoS profile.

host1(config)#qos-profile vcSharedShaping

4. Create group nodes.

host1(config-qos-profile)#atm group AF scheduler-profile default

host1(config-qos-profile)#atm group EF scheduler-profile default

5. Create VC nodes for each group and for traffic in the default group.

host1(config-qos-profile)#atm-vc node

host1(config-qos-profile)#atm-vc node group AF

host1(config-qos-profile)#atm-vc node group EF

6. Create queues for the best-effort, video, and voice traffic. Apply the scheduler profile that defines the shared-shaping rate to the best-effort queue. Apply the legacy shaper profiles to the voice and video traffic queues.

host1(config-qos-profile)#atm-vc queue traffic-class best-effort scheduler-profile 
shared-1mbps

host1(config-qos-profile)#atm-vc queue traffic-class video scheduler-profile 
300Kbps

host1(config-qos-profile)#atm-vc queue traffic-class voice scheduler-profile 
200Kbps

host1(config-qos-profile)#exit

7. Attach the QoS profile to an ATM subinterface.

host1(config)#interface atm 11/0.1

host1(config-interface)#qos-profile vcSharedShaping

host1(config-interface)#exit

In this example, the constituents of the VC shared shaper are the VC 1 best effort node, the VC 1 Group EF node, and the VC 1 Group AF node. The available bandwidth is strictly allocated in the following order:

1. VC 1 EF group node
2. VC 1 AF group node
3. VC 1 best effort node

To display the sample shared shaper configuration:

host1#show shared-shaper atm 11/0.1

                 shared  current

                 shaping shaping                           shaping

   interface      rate    rate           resource           rate

---------------- ------- ------- ------------------------- -------

atm-vc ATM11/0.1 1000000 compound best-effort atm-vc queue       

                                  atm-vc best-effort node        

                                  EF voice atm-vc queue     200000

                                  AF video atm-vc queue     300000

atm-vc ATM11/0.2 1000000 compound best-effort atm-vc queue       

                                  atm-vc best-effort node        

                                  EF voice atm-vc queue     200000

                                  AF video atm-vc queue     300000

 Total shared shapers: 2

 Total constituents:   8

 Total failovers:      0

Related Topics

• Configuring Compound Shared Shaping
• Compound Shared Shaping Overview