Advanced Traffic Management Guide K/KA/KB.15.15

Reconfiguring the 802.1p priority value currently assigned to a DSCP
codepoint
To reconfigure the 802.1p priority value currently assigned to a DSCP codepoint, enter one of the
following commands:
• Global configuration context:
qos dscp-map codepoint priority 0 - 7
• Policy configuration context:
class [ ipv4 | ipv6 ] classname action dscp codepoint priority 0 - 7
If you do not enter a priority value with the class action dscp command in a QoS policy,
one of the following occurs:
• The switch refers to the DSCP Policy table to assign the 802.1p value that is currently configured
for the specified DSCP codepoint to remark matching packets.
• If the specified DSCP codepoint is not associated with an 802.1p priority in the DSCP Policy
table, an error message is displayed and the class action dscp codepoint command
is not executed. You are prompted to reenter the command with an 802.1p priority: class
action dscp codepoint priority 0 - 7.
To ensure that the desired 802.1p priority is assigned to matching packets, you may need to first
remap the priority to the new codepoint before you configure the policy, by using the qos
dscp-map codepoint priority 0 - 7 command.
NOTE: After you reconfigure the 802.1p priority for a DSCP codepoint, the switch immediately
applies the new 802.1p priority value to packets transmitted with the associated codepoint as a
result of:
• Globally-configured QoS commands
• class action dscp commands in other QoS policies
Example 158 Applying classifier-based QoS policy to inbound traffic on VLAN
In the following example, a classifier-based QoS policy (dscp-remap) that assigns a new DSCP
codepoint (af43) and associated 802.1p priority (5) to matching packets with a specified DSCP
codepoint (af11) is applied to the inbound traffic on a VLAN.
HP Switch(config)#: qos dscp-map af43 priority 5
HP Switch(config)#: class ipv4 dscp5
HP Switch(config-class)#: match ip any any dscp af11
HP Switch(config-class)#: exit
HP Switch(config)#: policy qos dscp-remap
HP Switch(config-policy)#: class ipv4 dscp5 action dscp af43
HP Switch(config-policy)#: exit
HP Switch(config)#: vlan 3 service-policy dscp-remap in
NOTE: 802.1p priority is mapped to the specified DSCP codepoint by using the qos dscp-map
codepoint priority 0 - 7 command before the QoS policy is configured.
Viewing a classifier-based QoSconfiguration
Use the following show commands to display information about a classifier-based QoS configuration
and statistics or resource usage on QoS policies.
Syntax:
show class ipv4 classname
show class ipv6 classname
Reconfiguring the 802.1p priority value currently assigned to a DSCP codepoint 229