Nortel business policy switch 2000, Руководство пользователя

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Chapter 4 Policy-enabled networks 291
Using the Business Policy Switch 2000 Version 2.0
Packet classifiers or filters
Packet classifiers, or filters, select packets according to a particular content in the
packet header such as the source address, destination address, source port number,
destination port number, and others. Packet classifiers identify flows for more
processing.
You can create the following two types of filter groups:
• Layer 2 filters
• IP filters
A filter group is an ordered list of filters. Filters can be added to or deleted from an
existing group.
Real time, delay tolerant,
high variable bandwidth Gold Single human
communication with no
interaction (such as Web
site streaming video). High-priority scheduling
providing guaranteed minimum
provisioned bandwidth.
Competes for additional
bandwidth.
Non-real time, mission
critical, interactive Silver Transaction processing
(such as Telnet, Web
browsing). Medium priority scheduling
providing guaranteed minimum
provisioned bandwidth.
Competes for additional
bandwidth.
Non-real time, mission
critical, non-interactive Bronze For example, E-mail, FTP,
SNMP. Lower-priority scheduling
providing guaranteed minimum
provisioned bandwidth.
Competes for additional
bandwidth.
Non-real time,
non-mission critical Standard Bulk transfer (such as large
FTP transfers, after-hours
tape backup). Best effort delivery. Uses
remaining available bandwidth.
Table 56 Service classes (continued)
Traffic category Service class Application type Required treatment