Qos Supported By Switch 4500 Series; Introduction To Qos Functions; Traffic Classification - 3Com E4500-24 Cli Configuration Manual

QoS Supported By Switch 4500 Series

The Switch 4500 series support the QoS features listed in
Table 1-1 QoS features supported by Switch 4500 series
QoS Feature
Traffic
classification
QoS action
Congestion
avoidance
Congestion
management

Introduction to QoS Functions

Traffic Classification

Traffic here refers to service traffic; that is, all the packets passing the switch.
Traffic classification means identifying packets that conform to certain characteristics according to
certain rules. It is the foundation for providing differentiated services.
In traffic classification, the priority bit in the type of service (ToS) field in IP packet header can be used to
identify packets of different priorities. The network administrator can also define traffic classification
policies to identify packets by the combination of source address, destination address, MAC address, IP
Description
Classify incoming traffic based
on ACLs. The Switch 4500
series support the following
types of ACLs:
Basic ACLs
Advanced ACLs
Layer-2 ACLs
User-defined ACLs
The Switch 4500 series support
performing the following QoS
actions for packets matching the
specified ACL:
Priority marking
Traffic policing
VLAN Mapping
Traffic mirroring
You can configure the following
QoS actions as required on the
Switch 4500 series:
Priority trust mode
Protocol packet priority
Line rate
WRED
The Switch 4500 series support
SP, WFQ, and WRR queue
scheduling algorithms and
support the following five queue
scheduling modes:
SP
WFQ
WRR
SP+WFQ
SP+WRR
Table 1-1:
For information about ACLs, refer to the
ACL Operation and ACL Command
manuals.
For information about traffic classification,
refer to Traffic
For information about priority marking,
refer to Priority
For information about traffic policing, refer
to Traffic Policing.
For information about VLAN Mapping,
refer to VLAN
For information about traffic mirroring,
refer to Traffic
For information about priority trust mode,
refer to Priority Trust
For information about specifying priority
for protocol packets, refer to
Priority.
For information about line rate, refer
toLine Rate.
For information about congestion avoidance
and WRED, refer to
For information about SP, WFQ, and WRR,
refer to Queue
1-3
Refer to ...
Classification.
Marking.
Mapping.
mirroring.
Mode.
Protocol
Congestion Avoidance.
Scheduling.