User guide

166 CHAPTER 8: PRIORITIZING NETWORK TRAFFIC
■ Blocked Applications — selecting an application for blocking causes
traffic identified as belonging to that application to be dropped. Not
all devices are capable of dropping application traffic. A device must
be capable of both complex application classification and of dropping
traffic as a result of classification in order to drop application traffic.
3Com Network Administrator configures such devices to identify
traffic as belonging to an application by creating classifier rules. These
classifier rules are equivalent to the classifier rules that make up the
definition in the wizard. Traffic that matches these classifier rules is
mapped to the Drop service level. See “
3Com Network Administrator
Service Levels” on page 182 for definitions of the service levels used
by 3Com Network Administrator.
3Com Network Administrator imposes restrictions on the blocking of
SNMP traffic. In addition, there are various problems that may arise due
to selecting applications for blocking. For more information see
“
Potential Hazards of Blocking Application Traffic” on page 188.
If you prioritize traffic to and from a server then that server will also be
able to use any applications that are blocked.
Application Field Values
Application traffic is identified by examining certain fields in the packets
to see if they contain specific values. If you wish to add an application
that is not present in the list you will need to know the appropriate field
values required for that application.
More information on how to determine the appropriate field values is
available in “
Determining Field Values for Applications” on page 182.
Finish Step and Progress
Changes to your network traffic prioritization configuration are not
applied to your network until you select Finish on the Configuration
Summary dialog. After selecting Finish, the Prioritize Network Traffic
Wizard configures each of the supported 3Com devices in the inventory
file to prioritize network traffic according to your selected configuration.
During the configuration of the devices, the Configuring Prioritization
dialog is shown to indicate the progress.
3Com Network Administrator for HP OpenView.book Page 166 Wednesday, November 12, 2003 2:33 PM