JUNOSe 9.1.x Quality of Service Configuration Guide > Configuring an Integrated Scheduler to Provide QoS for ATM > Configuring Default Integrated Mode for ATM Interfaces

Configuring Default Integrated Mode for ATM Interfaces

In the default integrated mode, the SAR scheduler is the dominant scheduler, and it backpressures the first-stage (HRR) scheduler per VC. Each VC buffers only a few hundred bytes.

Figure 44 shows the default integrated mode.

Figure 44: Default Integrated Mode

To configure default integrated mode:

1. From the desired port, set the QoS port mode to default integrated mode.

host1(config)#interface atm 2/0 

host1(config-if)#no qos-mode-port 

 

 TIP: For ATM interfaces on ERX-7xx models, ERX-14xx models, and the ERX-310 router, you must specify port 0.



 

2. Specify the VP shaping rate.

host1(config-if)#atm vp-tunnel 0 2000 

TIP: Configuring an ATM VP tunnel sets a shaping rate in the SAR scheduler. Before configuring an ATM VP tunnel, there must be no PVCs with the same VPI that you are about to configure. Before using the atm vp-tunnel command, remove any PVCs from the configuration. You can reconfigure the PVCs after configuring the shapeless VP tunnel.

3. Specify the shaping rate for the ATM subinterface.

host1(config-if)#interface atm 2/0.5 

host1(config-subif)#atm-pvc 5 0 5 aal5snap 768 

Related Topics

• Per-Packet Queuing on the SAR Scheduler Overview
• Guidelines for Configuring QoS over ATM
• atm vp-tunnel command
• interface atm command
• qos-mode-port command