User guide

164 CHAPTER 8: PRIORITIZING NETWORK TRAFFIC
3Com Network Administrator configures devices that are capable of
classifying traffic based upon IP addresses to identify traffic going to or
from a server selected for prioritization. This is achieved by creating
classifier rules that match packets with either the destination or source
IP address respectively set to the IP address of the server. Traffic that
matches these classifier rules is mapped to the Business Critical service
level. See “
3Com Network Administrator Service Levels” on page 182
for definitions of the service levels used by 3Com Network
Administrator.
When you are configuring devices that are not capable of classifying
traffic based upon IP addresses, 3Com Network Administrator
configures these devices to identify traffic with the Business Critical
DiffServ codepoint. Traffic that matches this classifier rule is also
mapped to the Business Critical service level.
■ Blocked Servers — selecting a server for blocking simply causes
traffic to or from that server to be dropped by configured devices that
are capable of both classifying traffic based upon IP addresses and of
dropping traffic as a result of classification. 3Com Network
Administrator configures these devices to identify traffic going to or
from a server that has been selected for blocking. This is achieved by
creating classifier rules that match packets with either the destination
or source IP address respectively set to the IP address of the server.
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 service levels used by 3Com Network Administrator.
There are several servers that 3Com Network Administrator will not
allow you to select for blocking. In addition, there are various
problems that may arise due to selecting servers for blocking. For
more information see “
Potential Hazards When Blocking Traffic To and
From Servers” on page 186.
Applications Step
You can select applications for prioritization or blocking (See Figure 75
).
The Prioritize Network Traffic Wizard defines an application as a collection
of classifier rules, each of which specifies one method of identifying
traffic belonging to that application. These classifier rules specify the
values that certain fields with a packet must have in order for that packet
to be considered as belonging to the application.
3Com Network Administrator for HP OpenView.book Page 164 Wednesday, November 12, 2003 2:33 PM