3Com Switch 4800G PWR 24-Port, Руководство по настройке

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Table 1-1 QoS features supported by the Switch 4200G series
QoS Feature Description Reference
Traffic classification
Classify incoming traffic based on ACLs.
The Switch 4200G series support the
following types of ACLs:
z
Basic ACLs
z
Advanced ACLs
z
Layer 2 ACLs
z
For information about
ACLs, refer to the
ACL
Operation and ACL
Command manuals.
z
For information about
traffic classification, refer
to
Traffic Classification .
The Switch 4200G series support
performing the following QoS actions on
traffic matching the specified ACL:
z
Traffic policing
z
Traffic shaping
z
Traffic accounting
z
For information about
traffic policing, refer to
Traffic Policing and Traffic
Shaping
.
z
For information about
traffic shaping, refer to
Traffic Policing and Traffic
Shaping
.
z
For information about
traffic accounting, refer to
Flow-Based Traffic
Accounting
.
QoS actions
You can configure the following QoS
actions for traffic separately as required on
the Switch 4200G series:
z
Priority trust mode
z
Protocol packet priority
z
Burst
z
For information about
priority trust mode, refer to
Priority Trust Mode .
z
For information about
specifying priority for
protocol packets, refer to
Protocol Priority .
z
For information about the
burst function, refer to
Burst .
Congestion
management
The Switch 4200G series support SP,
WRR, and SDWRR for queuing and
support the following three queue
scheduling modes:
z
SP
z
SDWRR
z
SP+SDWRR
For information about SP,
WRR, and SDWRR, refer to
Queue Scheduling .
Introduction to QoS Features
Traffic Classification
Traffic here refers to service traffic, that is, all the packets passing by the switch.
Traffic classification identifies packets conforming to certain characteristics according to certain criteria.
It is the foundation for providing differentiated services.
In traffic classification, the priority bits in the type of service (ToS) field in the IP header can be used to
identify packets of different priorities. You can also define traffic match criteria to classify packets by the
combination of source address, destination address, MAC address, IP protocol or the port number of an
application. Contents other than the header information in packets are rarely used for traffic
classification. You can define a class for packets with the same quintuple (source address, source port
number, protocol number, destination address and destination port number for example), or for all
packets to a certain network segment.