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10.17.2 Class Commands
The 'class' command set is used in DiffServ to define:
Traffic Classification specifies Behavior Aggregate (BA) based on DSCP, and Multi- Field (MF)
classes of traffic (name, match criteria)
Service Levels specifies the BA forwarding classes / service levels. Conceptually, DiffServ is a
two-level hierarchy of classes: 1. Service/PHB, 2. Traffic Class
This set of commands consists of class creation/deletion and matching, with the class match commands
specifying layer 3, layer 2, and general match criteria. The class match criteria are also known as class
rules, with a class definition consisting of one or more rules to identify the traffic belonging to the class.
Note that once a class match criterion is created for a class, it cannot be changed or deleted - the entire
class must be deleted and re-created.
The CLI command root is class-map.
10.17.2.1 class-map
This command defines a new DiffServ class of type match-all, match-any or match-access-group.
Syntax
class-map [ match-all ] <class-map-name>
<class-map-name> is a case sensitive alphanumeric string from 1 to 31 characters uniquely identifying
the class.
Note: The class name 'default' is reserved and must not be used here.
When used without any match condition, this command enters the class-map mode. The
<class-map-name> is the name of an existing DiffServ class.
Note: The class name 'default' is reserved and is not allowed here. The class type of match-all indicates
all of the individual match conditions must be true for a packet to be considered a member of the class.
The class type of match-access-group indicates the individual class match criteria are evaluated based
on an access list (ACL).
<aclid> is an integer specifying an existing ACL number (refer to the appropriate ACL documentation for
the valid ACL number range). A matchaccess-group class type copies its set of match criteria from the
current rule definition of the specified ACL number. All elements of a single ACL Rule are treated by
DiffServ as a grouped set, similar to class type all. For any class, at least one class match condition must
be specified for the class to be considered valid.
Note: The class match conditions are obtained from the referenced access list at the time of class
creation. Thus, any subsequent changes to the referenced ACL definition do not affect the DiffServ class.
To pick up the latest ACL definition, the DiffServ class must be deleted and recreated. This command may
be used without specifying a class type to enter the Class-Map Config mode for an existing DiffServ class.
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