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JunosE 11.3.x Quality of Service Configuration Guide
QoS Shaping Mode for Ethernet Interfaces Overview
170
The SAR scheduler is not available for Ethernet interfaces. However, you can still configure
the operational shaping mode to shape ATM traffic based on either frames or cells by
issuing the qos-shaping-mode command.
Frame shaping mode is the default for Ethernet interfaces on all E Series Broadband
Services Routers. You can configure cell shaping mode for the following interfaces:
Gigabit Ethernet interfaces on the GE-2 line module and the GE-HDE line module on
ERX routers
Gigabit Ethernet and 10-Gigabit Ethernet interfaces on the ES2 4G LM on E120 and
E320 Broadband Services routers
10-Gigabit Ethernet interfaces on the ES2 10G LM on E120 and E320 routers
When you use cell shaping mode to configure the shaping or policing rate, the resulting
traffic stream conforms exactly to the policing rates configured in downstream ATM
switches. Using cell shaping also reduces the number of packet drops in the Ethernet
network.
The setting for port 0 provides the default shaping mode for all ports on the same I/O
module or IOA. Individual ports can have a specific shaping mode setting that overrides
the setting for port 0.
If you do not configure the QoS shaping mode for a port, the shaping mode is calculated
using the value for port 0 on the same I/O module or IOA. If the port's shaping mode is
configured, the system uses the port's shaping mode.
Table 19 on page 170 lists the possible combinations of the qos-shaping-mode command
and the resultant operational shaping mode.
Table 19: Operational Shaping Modes
qos-shaping-mode
qos-shaping-mode
for Port 0
for Other Ports
Cell
Cell
Frame
Frame
Cell
Frame
Frame
Cell
Frame
No shaping mode
Cell
No shaping mode
No shaping mode
No shaping mode
Operational
Shaping Mode
Cell
Frame
Frame
Cell
Frame
Cell
Frame
Copyright © 2010, Juniper Networks, Inc.
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