Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010, Configuration Manual

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Chapter 29
Configuring Byte Adjustment for Shaping
Rates with QoS Parameters
This chapter provides information for configuring byte adjustment with quality of
service (QoS) parameters on E Series routers.
QoS parameters are discussed in the following sections:
■
Byte Adjustment for ADSL and VDSL Traffic Overview on page 293
■
Guidelines for Configuring Byte Adjustment of Cell and Frame Shaping Rates
Using QoS Parameters on page 296
■
Configuring a Parameter Definition to Adjust Cell Shaping Rates for ADSL
Traffic on page 297
■
Configuring a Parameter Definition to Adjust Frame Shaping Rates for VDSL
Traffic on page 299
Byte Adjustment for ADSL and VDSL Traffic Overview
You can associate a parameter definition with a byte adjustment application to adjust
the shaping rates for ADSL and VDSL traffic on E Series Broadband Services Routers.
The byte adjustment differs for interfaces with cell shaping mode and frame shaping
mode. For ADSL traffic, JUNOSe software supports a byte adjustment application
(
qos-byte-adjustment ) to adjust rates for cell shaping mode. For VDSL traffic, JUNOSe
software supports a frame byte-adjustment application ( qos-frame-byte-adjustment )
to adjust rates for frame shaping mode.
Frame is the default shaping mode for Ethernet interfaces on E Series routers. To
configure the cell shaping mode, issue the
qos-shaping-mode command or by
specifying the qos-cell-mode application with a parameter definition.
Byte Adjustment for Cell Shaping of ADSL Traffic Overview
Managing the bandwidth of downstream ATM traffic to Ethernet interfaces is difficult
because of the different layer 2 encapsulations. To reduce the number of packet
drops in the Ethernet network, you can use the byte adjustment applications to
account for the different encapsulations.
Byte Adjustment for ADSL and VDSL Traffic Overview
■ 293