Configuring The Qos Shaping Mode For Atm Interfaces - Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010 Configuration Manual

JUNOSe 11.1.x Quality of Service Configuration Guide
TIP: For ATM interfaces on ERX7xx models, ERX14xx models, and the ERX310
router, you must specify port 0.
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.
Related Topics

Configuring the QoS Shaping Mode for ATM Interfaces

In frame mode, SAR shaping is controlled by the ATM application. Shaping is based
on the number of bytes in the frame, without regard to cell encapsulation or padding
overhead; this is the default mode.
In cell mode, SAR shaping is controlled by the QoS application. Shaping is based on
the number of bytes in cells, and accounts for the ATM cell encapsulation and padding
overhead.
To configure the operational shaping mode for ATM interfaces:
1.
2.
174
Configuring the QoS Shaping Mode for ATM Interfaces
The qos-mode-port command:
Excludes non-UBR ATM QoS services on any VC on the ATM module; for
example, PCR, nrtVBR, and CBR
Cannot be used if shaping is currently configured on the SAR scheduler
Cannot be used with ATM VP tunnels with nonzero rates; however, can be
used with tunnels with rates of zero (shapeless tunnels)
Per-Packet Queuing on the SAR Scheduler Overview on page 163
Guidelines for Configuring QoS over ATM on page 166
atm vp-tunnel
interface atm
qos-mode-port
Configure the ATM interface.
host1(config)#interface atm 5/1
For ATM interfaces on ERX7xx models, ERX14xx models, and the ERX310 router,
you must use port 0.
Configure the shaping mode and specify either frame or cell.
host1(config-if)#qos-shaping-mode cell