1-3
z Congestion management handles resource competition during network congestion.
Generally, it adds packets to queues first, and then forwards the packets by using a
scheduling algorithm. Congestion management is usually applied in the outbound
direction of a port.
z Congestion avoidance monitors the use of network resources and drops packets
actively when congestion reaches certain degree. It relieves network load by adjusting
traffics. Congestion avoidance is usually applied in the outbound direction of a port.
Traffic classification is the basis of all the above-mentioned traffic management
technologies. It identifies packets using certain rules and makes differentiated services
possible. Traffic policing, traffic shaping, congestion management, and congestion
avoidance are methods for implementing network traffic control and network resource
management. They are occurrences of differentiated services.
QoS Supported By Switch 5500-EI Series
The Switch 5500-EI series support the QoS features listed in Table 1-1:
Table 1-1 QoS features supported by Switch 5500-EI series
QoS Feature Description Refer to …
Traffic
classification
Classify incoming traffic
based on ACLs. The Switch
5500-EI 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 5500-EI series
support performing the
following QoS actions for
packets matching the
specified ACL:
z Priority marking
z Traffic policing
z Traffic redirecting
z VLAN Mapping
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 VLAN
Mapping, refer to
VLAN Mapping.
z For information about traffic
accounting, refer to
Flow-based
Traffic Accounting
.
z For information about traffic
mirroring, refer to
Traffic mirroring.
QoS action
You can configure the
following QoS actions as
required on the Switch
5500-EI series:
z Priority trust mode
z Protocol packet priority
z Line rate
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 line rate, refer
to
Line Rate.
z For information about the burst
function, refer to
Burst.
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