3Com 4007, Руководство по внедрению, Страница: 574 / 684

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The following items describe how QoS control aggregate rate limit for
flow classifiers works on ports that are in certain groups.
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QoS control aggregate behavior for flow classifiers works only on
ports that are in certain groups. The aggregate ports are treated as
one port for the rate limit specified.
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That is, if a 50-percent rate limit is specified for applicable 100 MB
ports, then the aggregate ports total rate in each group adds up to
50 percent of 100 MB or 50 MB.
The following list describes Multilayer Switching Modules and what ports
support QoS aggregate rate limit for flow classifiers:
■
The 12-port 10/100BASE-TX Fast Ethernet Multilayer Switching
Module (Model Number 3CB9RF12R) allows aggregation on ports 1-3,
4-6, 7-9, and 10-12.
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No ports can be aggregated on the 4-Port Gigabit Ethernet Multilayer
Switching Module (GBIC) (Model Number 3CB9RG4). Aggregate
works the same as ReceivePort if specified.
QoS Classifiers
You define classifiers to distinguish certain types of traffic from other
types of traffic. A classifier directs the Multilayer Switching Module how
to identify a certain type of traffic. After you define a classifier, you must
apply a control to the classifier.
Important
Considerations
Review the following considerations before you configure classifiers:
■
You can classify bridged or routed traffic (such as AppleTalk or IPX)
based on protocol type, cast type, and IEEE 802.1p priority. For routed
IP traffic, you can also classify traffic by IP source addresses,
destination addresses, or TCP or UDP sockets.
■
Before you define a classifier, determine whether you can use one of
the Multilayer Switching Module’s predefined classifiers (classifiers that
come with your Multilayer Switching Module). If you decide to define
your own classifier, you need to decide which type of classifier to
define:
flow (IP routed traffic only) or nonflow (bridged or routed
traffic).