1-3
QoS Supported by the 4210 Series Ethernet Switches
The 4210 series Ethernet switches support the QoS features listed in Table 1-1.
Table 1-1 QoS features supported by the 4210 series Ethernet switches
Category Features Refer to…
Traffic
classification
Incoming traffic classification
based on ACLs of the
following types:
z Basic ACLs
z Advanced ACLs
z Layer-2 ACLs
z For detailed information about ACLs, refer to
the ACL module in this manual.
z For information about traffic classification,
refer to
Traffic Classification.
QoS actions for packets
matching the specified ACL:
z Priority marking
z Traffic policing
z Traffic redirecting
z Traffic accounting
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 traffic redirecting, refer
to
Traffic Redirecting.
z For information about traffic accounting, refer
to
Flow-Based Traffic Accounting.
z For information about traffic mirroring, refer
to
Traffic Mirroring.
QoS action
QoS actions directly
configured as required:
z Priority trust mode
z Line rate
z Burst
z For information about priority trust mode,
refer to
Priority trust mode.
z For information about line rate, refer to Port
Rate Limiting
.
z For information about the burst function, refer
to
Burst.
Congestion
management
WRR, and HQ-WRR queue
scheduling algorithms
For introduction to WRR, and HQ-WRR queue
scheduling algorithms, refer to
Queue
Scheduling
.
Introduction to QoS Features
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
protocol or the port number of an application. Normally, traffic classification is done by checking the
information carried in packet header. Packet payload is rarely adopted for traffic classification. The
identifying rule is unlimited in range. It can be a quintuplet consisting of source address, source port
number, protocol number, destination address, and destination port number. It can also be simply a
network segment.
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