Cisco WAP571, Руководство администратора

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Client Quality of Service
Class Map
Cisco WAP571/E Administration Guide 122
8
Class Map
The QoS feature contains Differentiated Services (DiffServ) support that allows
traffic to be classified into streams and given a certain QoS treatment in
accordance with defined per-hop behaviors.
Standard IP-based networks are designed to provide best-effort data delivery
service. Best-effort service implies that the network delivers the data in a timely
fashion, although there is no guarantee that it will. During times of congestion,
packets may be delayed, sent sporadically, or dropped. For typical Internet
applications, such as e-mail and file transfer, a slight degradation in service is
acceptable and in many cases unnoticeable. However, on applications with strict
timing requirements, such as voice or multimedia, any degradation of service has
undesirable effects.
A DiffServ configuration begins with defining class maps, which classify traffic
according to their IP protocol and other criteria. Each class map can then be
associated with a policy map, which defines how to handle the traffic class.
Classes that include time-sensitive traffic can be assigned to policy maps that
give precedence over other traffic.
You can use the Class Map page to define classes of traffic. Use the Policy Map
page to define policies and associate class maps to them.
To add and configure an IPv4 class map:
STEP 1
Select Client QoS > Class Map .
STEP 2
In the Class Map Name field, enter the name for the new class map. The name can
contain from 1 to 31 alphanumeric and special characters. Spaces are not
allowed.
STEP 3
Choose IPv4 as the type of class map from the Class Map Type list. The IPv4 class
map applies only to IPv4 traffic on the WAP device.
STEP 4
In the Match Criteria Configuration area, configure these parameters to match the
packets to a class:
• Class Map Name —Choose the IPv4 class map from the list.
• Match Every Packet —The match condition is true to all parameters in a
Layer 3 packet. When enabled, all Layer 3 packets will match the condition.
• Protocol —Uses a Layer 3 or Layer 4 protocol match condition based on the
value of the IP Protocol field in IPv4 packets or the Next Header field in IPv6
packets. Choose the protocol to match by keyword or enter a protocol ID: