Brocade FastIron Ethernet Switch Traffic Management Guide - Manual (Page 34)

Using ACLs to honor DSCP-based QoS
This section shows how to configure Brocade devices to honor DSCP-based QoS for routed and
switched traffic.
FCX and ICX devices
Brocade FCX, ICX 6430, ICX 6450, ICX 6610, and ICX 6650 devices support DSCP-based QoS on a
per-port basis. DSCP-based QoS is not automatically honored for switched traffic. The default is
802.1p to CoS mapping. To honor DSCP-based QoS, enter the following command at the interface
level of the CLI.
[no] trust dscp
To disable the configuration, use the no form of the command.
When trust dscp is enabled, the interface honors the Layer 3 DSCP value. By default, the interface
honors the Layer 2 CoS value.
NOTE
The trust dscp command is not supported with 802.1p priority override.
FSX Series devices
FSX devices require the use of an ACL to honor DSCP-based QoS for routed traffic in the Layer 3
image, or for switched traffic in the Layer 2 image. To enable DSCP-based QoS on these devices,
apply an ACL entry such as the following.
device(config)#access-list 101 permit ip any any dscp-cos-mapping
NOTE
Use the bridged-routed keyword in the ACL to honor DSCP for switched traffic in the Layer 3 image.
Refer to "Enabling ACL support for switched traffic in the router image" section in the FastIron Ethernet
Switch Security Configuration Guide .
NOTE
The access-list 101 permit ip any any dscp-cos-mapping command is supported on the SX-
FI48GPP interface module. For more information on QoS queues for the SX-FI48GPP interface
module, refer to
Queues for the SX-FI48GPP interface module on page 20.
Trust DSCP for the SX-FI48GPP, SX-FI-24GPP, SX-FI-24HF, SX-FI-2XG,
and SX-FI8XG modules
On the following modules, trust DSCP can be enabled on a per-port basis:
• SX-FI48GPP
• SX-FI-24GPP
• SX-FI-24HF
• SX-FI-2XG
• SX-FI-8XG
Using ACLs to honor DSCP-based QoS
32 FastIron Ethernet Switch Traffic Management Guide
53-1003093-03