Overview of Class of Service Functions in Transparent Mode

Devices operating in Layer 2 transparent mode support the following Class-of-Service (CoS) functions:

• IEEE 802.1p behavior aggregate (BA) classifiers to determine the forwarding treatment for packets entering the device

  Note that only IEEE 802.1p BA classifier types are supported on devices operating in transparent mode.

• Rewrite rules to redefine IEEE 802.1 CoS values in outgoing packets

  Note that rewrite rules that redefine IP precedence CoS values and Differentiated Services Code Point (DSCP) CoS values are not supported on devices operating in transparent mode.

• Shapers to apply rate limiting to an interface
• Schedulers that define the properties of an output queue

For more information about CoS components and configuring CoS on SRX Series devices, see Junos OS Class of Service Configuration Guide for Security Devices.

You configure BA classifiers and rewrite rules on transparent mode devices in the same way as on devices operating in Layer 3 mode. For transparent mode devices, however, you apply BA classifiers and rewrite rules only to logical interfaces configured with the family bridge configuration statement. For more information about configuring Layer 2 logical interfaces, see Configuring Layer 2 Logical Interfaces.

Related Topics

• Understanding BA Traffic Classification on Transparent Mode Devices
• Understanding Rewrite of Packet Headers on Transparent Mode Devices