Brocade FastIron Ethernet Switch Security Configuration Guide - Manual (Page 137)

The dscp-cos-mapping option maps the DSCP value in incoming packets to a hardware table that
provides mapping of each of the 0 - 63 DSCP values, and distributes them among eight traffic classes
(internal priorities) and eight 802.1p priorities.
NOTE
The dscp-cos-mapping option overrides port-based priority settings.
By default, the Brocade device does the 802.1p to CoS mapping. If you want to change the priority
mapping to DSCP to CoS mapping, you must enter the following ACL statement.
permit ip any any dscp-cos-mapping
The complete CLI syntax for this feature is shown in Extended numbered ACL configuration on page
112 and Extended named ACL configuration on page 118. The following shows the syntax specific to
the DSCP Cos mapping feature.
[ dscp-marking dscp-value dscp-cos-mapping ]
or
[ dscp-cos-mapping ]
NOTE
The dscp-cos-mapping option should not be used when assigning an 802.1p priority. To assign an
802.1p priority to a specific DSCP (using dscp-match ), re-assign the DSCP value as well. For
exampledevice(config)#access-list 100 permit ip any any dscp-match dscp-marking
802.1p internal
Using an IP ACL to mark DSCP values (DSCP marking)
The dscp-marking option for extended ACLs allows you to configure an ACL that marks matching
packets with a specified DSCP value. You also can use DSCP marking to assign traffic to a specific
hardware forwarding queue (refer to
Using an ACL to change the forwarding queue on page 139).
For example, the following commands configure an ACL that marks all IP packets with DSCP value 5.
The ACL is then applied to incoming packets on interface 7. Consequently, all inbound packets on
interface 7 are marked with the specified DSCP value.
device(config)#access-list 120 permit ip any any dscp-marking 5 dscp-cos-mapping
device(config)#interface 1/7
device(config-if-e1000-1/7)#ip access-group 120 in
Syntax: dscp-marking dscp-value
The dscp-marking dscp-value parameter marks all traffic to a new DSCP value which can be from 0
through 63.
NOTE
The dscp-cos-mapping option is supported on FSX devices only.
Combined ACL for 802.1p marking
Brocade devices support a simple method for assigning an 802.1p priority value to packets without
affecting the actual packet or the DSCP. In early IronWare software releases, users were required to
Using an IP ACL to mark DSCP values (DSCP marking)
FastIron Ethernet Switch Security Configuration Guide 137
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