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Cisco MDS 9000 Fabric Manager Switch Configuration Guide
OL-7753-01
Chapter 27 Configuring Traffic Management
Data Traffic
Step 4
Apply the configuration.
Enabling QoS for Data Traffic
By default, the QoS data traffic feature is disabled for data traffic. To configure QoS for data traffic, you
must first enable the data traffic feature in the switch.
QoS is supported in interoperability mode. The effectiveness of the setting depends on the location of
MDS switches in the fabric relative to the location of the source or destination of the prioritized devices.
Creating Class Maps
Use the
class-map
option to create and define a traffic class with match criteria to identify traffic
belonging to that class. Define each match criterion with one match statement from the class map
configuration (switch(config-cmap)) mode. The class map name is restricted to 63 alphanumeric
characters and defaults to the
match-all
option. Flow-based traffic uses one of the following values:
•
WWN—Use the
source-wwn
option to specify the source WWN or the
destination-wwn
option to
specify the destination WWN.
•
Fibre Channel ID (FC ID)—Use the
source-address
option to specify the source ID (SID) or the
destination-address
option to specify the destination ID (DID). The possible values for mask are:
–
FFFFFF—The entire FCID is used. This is the default.
–
FFFF00—Only domain and area FCID is used.
–
FF0000—Only domain FCID is used.
A source-address
or destination-address
of 0x000000 is not allowed.
•
Source interface—Use the
input-interface
option to specify the ingress interface.
The order of entries to be matched within a class map is not significant.
Defining Service Policies
Service policies are specified using policy maps. Policy maps provide an ordered mapping of class maps
to service levels. You can specify multiple class maps within a policy map, and map a class map to a
high, medium, or low service level. The default priority is low.
As an alternative, you can map a class map to a Differentiated Services Code Point (DSCP).The DSCP
is an indicator of the service level for a specified frame. The DSCP value ranges from 0 to 63, and the
default is 0. A DSCP value of 46 is disallowed.
The order of the class maps within a policy map is important to determine the order in which the frame
is compared to class maps. The first matching class map has the corresponding priority marked in the
frame. See
http://www.cisco.com/warp/public/105/dscpvalues.html#dscpandassuredforwardingclasses
for further information on implementing QoS DSCP values.
Use the
policy-map
option to specify the class of service. The policy map name is restricted to 63
alphanumeric characters.
Class-maps are processed in the order in which they are configured in each policy-map.
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