Configuration Guide User guide

1980 FastIron Configuration Guide
53-1002494-02
Marking
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.
Brocade(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.
Syntax: show run interface ethernet <port>
Specify the port variable in one of the following formats:
• FWS, FCX, and ICX stackable switches – stack-unit/slotnum/portnum
• FSX 800 and FSX 1600 chassis devices – slotnum/portnum
• ICX devices – slotnum/portnum
• FESX compact switches – portnum
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. Marking is performed using ACLs. When marking is
not used, the device still performs the mappings listed in “QoS overview” on page 1963 for
scheduling the packet, but leaves the packet QoS values unchanged when the device forwards the
packet.
For configuration syntax, rules, and examples of QoS marking, refer to “QoS options for IP ACLs” on
page 1740.
Brocade#show run interface ethernet 1
interface ethernet 1
priority ignore-8021p