Netgear 7300S User Manual download pdf (Page 272)

User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software

11-8 Quality of Service (QoS) Commands

202-10088-01, March 2005

Note that the type of class - all, any, or acl - has a bearing on the validity of match criteria specified

when defining the class. A class type of 'any' processes its match rules in an ordered sequence;

additional rules specified for such a class simply extend this list. A class type of ‘acl’ obtains its

rule list by interpreting each ACL rule definition at the time the Diffserv class is created.

Differences arise when specifying match criteria for a class type 'all', since only one value for each

non-excluded match field is allowed within a class definition. If a field is already specified for a

class, all subsequent attempts to specify the same field fail, including the cases where a field can

be specified multiple ways through alternative formats. The exception to this is when the 'exclude'

option is specified, in which case this restriction does not apply to the excluded fields.

The following class restrictions are imposed by the DiffServ design:

• nested class support limited to:

 'any' within 'any'

 'all' within 'all'

 no nested 'not' conditions

 no nested 'acl' class types

 each class contains at most one referenced class

• hierarchical service policies not supported in a class definition

• access list matched by reference only, and must be sole criterion in a class

 i.e., ACL rules copied as class match criteria at time of class creation, with class

type 'any'

 implicit ACL 'deny all' rule also copied

 no nesting of class type 'acl'

Regarding nested classes, referred to here as class references, a given class definition can contain

at most one reference to another class, which can be combined with other match criteria. The

referenced class is truly a reference and not a copy, since additions to a referenced class affect all

classes that reference it. Changes to any class definition currently referenced by any other class

must result in valid class definitions for all derived classes otherwise the change is rejected. A

class reference may be removed from a class definition.

The user can display summary and detailed information for classes, policies and services. All

configuration information is accessible via the CLI, Web, and SNMP user interfaces.

diffserv

This command sets the DiffServ operational mode to active. While disabled, the DiffServ

configuration is retained and can be changed, but it is not activated. When enabled, Diffserv

services are activated.

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Netgear 7300S User Manual Page 272