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JunosE 11.3.x Quality of Service Configuration Guide
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Configuring the QoS Shaping Mode for ATM Interfaces
166
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.
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 155
Guidelines for Configuring QoS over ATM on page 158
atm vp-tunnel
interface atm
qos-mode-port
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:
Configure the ATM interface.
1.
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.
2.
host1(config-if)#qos-shaping-mode cell
BEST PRACTICE: We recommend that you clear the statistics counters
whenever you change the QoS shaping mode. Otherwise, the statistics
contain a mixture of frame-based and cell-based values.
Copyright © 2010, Juniper Networks, Inc.
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