Brocade FastIron Ethernet Switch Traffic Management Guide - Manual (Page 31)

Note that the original 802.1p priority in the packet will be retained. This feature does not re-mark the
802.1p value.
Configuration notes and feature limitations
• 802.1p priority override is supported on physical ports and trunk ports. When applied to the primary
port of a trunk group, the configuration applies to all members of the trunk group.
• This feature is not supported together with trust dscp .
Enabling 802.1p priority override
To enable 802.1p priority override, enter the following command at the interface level of the CLI.
device(config-if-e1000-2)#priority ignore-8021p
Syntax: [no] priority ignore-8021p
Use the following command to show whether 802.1p priority override is enabled on a port.
device# show run interface ethernet 1
interface ethernet 1
priority ignore-8021p
Syntax: show run interface ethernet port
Marking
Marking is the process of changing the packet QoS information (the 802.1p and DSCP information in a
packet) for the next hop. For example, for traffic coming from a device that does not support
Differentiated Services (DiffServ), you can change the packet IP precedence value into a DSCP value
before forwarding the packet.
You can mark a packet’s Layer 2 CoS value, its Layer 3 DSCP value, or both values. The Layer 2 CoS
or DSCP value the device marks in the packet is the same value that results from mapping the packet
QoS value into a Layer 2 CoS or DSCP value.
Marking is optional and is disabled by default. In releases prior to IronWare 8.0, marking is performed
only using ACLs. For configuration syntax, rules, and examples of QoS marking, refer to "QoS options
for IP ACLs" section in the FastIron Ethernet Switch Security Configuration Guide .
DSCP and CoS global remarking
NOTE
DSCP and CoS global marking is not supported on ICX 6650.
When marking is not used, the device performs the mappings listed for scheduling the packet, but
leaves the packet QoS values unchanged when the device forwards the packet. For more information,
refer to the
QoS overview on page 12. When marking is not enabled using ACLs, a rogue host that
wants preferential treatment for all its traffic can mark the DSCP field as per its requirements and send
the traffic to the device.
Configuration notes and feature limitations
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