Qos Supported By Switch 4500 Series - 3Com 4500 PWR 26-Port Configuration Manual

QoS Supported By Switch 4500 Series
Th e Switch 4500
Table 45-1 QoS fea
QoS Feature
Traffic
classification
QoS action
Congestion
avoidance
Congestion
management
Intro duction to QoS Functions
Traffi c 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
series suppo rt the QoS fea
tures supported by Switch 45
Description
Classify incoming traffic based
on ACLs. The Switch
series support the f ollowing
types of ACLs:
Basic ACLs
Advanced ACLs
Layer-2 ACLs
User-defined ACLs
The Switch 4500 series support
performing the follow
actions for packets m
specified ACL:
Priority marking
Traffic policing
VLAN Mapping
Traffic mirroring
You can configure the following
QoS actions a s required on the
Switch 4500 s eries:
Prior ity trust mode
Protocol packet priority
Line rate
WRED
The Switch 4500 se ries support
SP, WFQ , and WRR queue
scheduling algorithms and
support the following five queue
scheduling mod es:
SP
WFQ
WRR
SP+WFQ
SP+WRR
tures listed in Table 45-1
00 series
4500
For information about ACLs, r
ACL Operation and ACL Command
manuals.
For information about traffic classification,
refer to
For information about priority marking,
ing QoS
refer to
atching the
For information about traffic policing, refer
to Traffic
For information about VLAN Mapping,
refer to
For information about traffic mirroring,
refer to
For inform
refer to
For information ab out 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 Scheduling
45-3
:
Refer to ...
efer to the
Traffic Classification.
Priority Marking .
Policing.
VLAN Mapping.
Traffic mirroring .
ation about priority trust mode,
Priority Trust Mode .
.
Congestion Avoidance
.
Protocol
.