Specifications

116 ExtremeWare XOS 11.0 Concepts Guide
Quality of Service
Changing the default DiffServ code point mapping . You can change the QoS profile assignment for
each of the 64 code points using the following command:
configure diffserv examination code-point <code-point> [qosprofile <qosprofile>]
Once assigned, the rest of the switches in the network prioritize the packet using the characteristics
specified by the QoS profile.
Replacing DiffServ code points. The switch can be configured to change the DiffServ code point in
the packet prior to the packet being transmitted by the switch. This is done with no impact on switch
performance.
The DiffServ code point value used in overwriting the original value in a packet is determined by the
QoS profile. You enter the QoS profile you want to use to determine the replacement DiffServ code
point value.
To replace DiffServ code points, you must enable DiffServ replacement using the following commands
enable diffserv replacement ports [<port_list> | all]
NOTE
The port in this command is the ingress port. This command affects only that traffic based on explicit
packet class of service information and physical/logical configuration.
The default QoS profile to DiffServ code point mapping is shown in Table 21, and the default 802.1p
priority value to code point mapping is described in Table 22.
You change the DiffServ code point mapping, using either the QoS profile or the 802.1p value, to any
code point value using the following command:
configure diffserv replacement [qosprofile <qosprofile> | priority <value>]
code-point <code_point>
NOTE
Extreme Networks recommends that you use the qosprofile <qosprofile> value to configure this
parameter.
Table 22: Default 802.1p priority value-to-DiffServ code point mapping
QoS Profile
802.1p Priority
value
Code Point
QP1 0 0
QP2 1 8
QP3 2 16
QP4 3 24
QP5 4 32
QP6 5 40
QP7 6 48
QP8 7 56