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Configuring the QoS Shaping Mode for Ethernet Interfaces
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Copyright © 2010, Juniper Networks, Inc.
Chapter 20: Configuring QoS for Gigabit Ethernet Interfaces and VLAN Subinterfaces
To account for different layer 2 encapsulations, you can configure the byte adjustment
application using QoS parameters. The byte adjustment is calculated differently for
frame shaping mode than cell shaping mode.
NOTE: You can also use the QoS cell mode application with QoS parameters
to configure the shaping mode for a port.
Configuring the QoS Shaping Mode for Ethernet Interfaces on page 171
Byte Adjustment for ADSL and VDSL Traffic Overview on page 275
Cell Shaping Mode Using QoS Parameters Overview on page 265
You can configure the shaping mode for an Ethernet interface.
In frame mode, traffic shaping is controlled by the system. Shaping is based on the number
of bytes in the frame, without regard to cell encapsulation or padding overhead; this is
the default mode for all E Series routers.
In cell mode, 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.
This option is available only for Gigabit Ethernet interfaces configured on the GE-2 line
module, the GE-HDE line module, and the ES2 4G LM, and 10-Gigabit Ethernet interfaces
configured on the ES2 4G LM.
Configure the Ethernet interface.
1.
host1(config)#interface gigabitEthernet 6/0/0
Configure the shaping mode and specify frame or cell.
2.
host1(config)#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.
QoS Shaping Mode for Ethernet Interfaces Overview on page 170
interface gigabitEthernet
qos-shaping-mode
171
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