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QoS Supported By Switch 4500 Series
The Switch 4500 series support the QoS features listed in Table 1-1:
Table 1-1 QoS features supported by Switch 4500 series
QoS Feature Description Refer to …
Traffic
classification
Classify incoming traffic based
on ACLs. The Switch 4500
series support the following
types of ACLs:
z Basic ACLs
z Advanced ACLs
z Layer-2 ACLs
z User-defined 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 4500 series support
performing the following QoS
actions for packets matching the
specified ACL:
z Priority marking
z Traffic policing
z VLAN Mapping
z Traffic mirroring
z For information about priority marking,
refer to
Priority Marking.
z For information about traffic policing, refer
to
Traffic Policing.
z For information about VLAN Mapping,
refer to
VLAN Mapping.
z For information about traffic mirroring,
refer to
Traffic mirroring.
QoS action
You can configure the following
QoS actions as required on the
Switch 4500 series:
z Priority trust mode
z Protocol packet priority
z Line rate
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 line rate, refer
to
Line Rate.
Congestion
avoidance
WRED
For information about congestion avoidance
and WRED, refer to
Congestion Avoidance.
Congestion
management
The Switch 4500 series support
SP, WFQ, and WRR queue
scheduling algorithms and
support the following five queue
scheduling modes:
z SP
z WFQ
z WRR
z SP+WFQ
z SP+WRR
For information about SP, WFQ, and WRR,
refer to
Queue Scheduling.
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