Components 635Servers StepYou can select servers for prioritization or blocking. In terms of thePrioritize Network Traffic Wizard, a server can be any device with an IPaddress regardless of whether or not the device is present in the 3ComNetwork Director map. This enables you to perform actions such asblocking traffic to and from streaming media servers that are external toyour company or to prioritize traffic to and from your partners websites.■ Prioritized Servers — when a server is prioritized, two things occur:■ Traffic to or from the prioritized server will be treated as moreimportant than non-prioritized traffic by the configured devices.Traffic will, therefore, flow through the network faster and withless chance of being dropped.■ Prioritizing the server overrides application blocking, so a serverselected for prioritization will still be able to use applications thatare selected for blocking without the devices in the networkdropping the application’s traffic. 3Com Network Directorconfigures devices that are capable of classifying traffic based uponIP addresses to identify traffic going to or from a server selected forprioritization. This is achieved by creating classifier rules that matchpackets with either the destination or source IP address respectivelyset to the IP address of the server. Traffic that matches theseclassifier rules is mapped to the Business Critical service level. See“3Com Network Director Service Levels” on page 655 fordefinitions of the service levels used by 3Com Network Director.When you are configuring devices that are not capable of classifyingtraffic based upon IP addresses, 3Com Network Director configuresthese devices to identify traffic with the Business Critical DiffServcodepoint. Traffic that matches this classifier rule is also mapped tothe Business Critical service level.■ Blocked Servers — selecting a server for blocking simply causestraffic to or from that server to be dropped by configured devices thatare capable of both classifying traffic based upon IP addresses and ofdropping traffic as a result of classification. 3Com Network Directorconfigures these devices to identify traffic going to or from a serverthat has been selected for blocking. This is achieved by creatingclassifier rules that match packets with either the destination or sourceIP address respectively set to the IP address of the server. Traffic thatmatches these classifier rules is mapped to the Drop service level. See“3Com Network Director Service Levels” on page 655 for definitionsof service levels used by 3Com Network Director.
