3Com 4007, Руководство по внедрению, Страница: 583 / 684

QoS Controls 583
Assigning Control
Numbers
Each control must have a unique control number. When you define a
control, the Multilayer Switching Module provides the next-available
control number, but you can specify any unreserved control number.
The Multilayer Switching Module supports control numbers in the range
of from 0 through 50 and predefines controls 1 through 4 for some of
the predefined nonflow classifiers. Control 1 is associated with the
default classifier and can be modified but not removed. You can modify
the other predefined controls as well (2 through 4). For example, to
redefine the way Business Critical traffic is handled, you may want to
modify predefined control 3.
Table 94 lists the predefined controls.
Use your configuration tool (such as the Administration Console) to
display summary and detail information for your controls.
When you define a control, you supply the following information:
■
Control number in the range of from 5 through 50 (unless you remove
the predefined controls from predefined classifiers)
■
Control name (a unique name of up to 32 characters long)
■
Rate-limit type for the control (none, receivePort, or aggregate)
■
Service level (transmit priority) for conforming packets.
■
Whether the conforming packets are loss eligible. The default is no.
Table 94 Predefined Controls
Control
Number/Name
Service Level
Classifiers
Controlled
Other Characteristics
1
Default/Best Effort
best 499 (default) No rate limit, not loss
eligible, no priority
2
Background
low 401, 402 No rate limit, not loss
eligible, no priority
3
Business Critical
best 403 No rate limit, not loss
eligible, no priority
4
Controlled Load
high 404, 405, 406,
407 No rate limit, not loss
eligible, no priority