3Com 5500-EI PWR Install Manual page 661

1 QoS Configuration ········································································································ 1-1
Overview ···················································································································· 1-1
Introduction to QoS ······························································································ 1-1
Traditional Packet Forwarding Service ·································································· 1-1
New Applications and New Requirements ······························································ 1-1
Major Traffic Control Techniques ·········································································· 1-2
QoS Supported By Switch 5500-EI Series ···································································· 1-3
Introduction to QoS Functions ····················································································· 1-4
Traffic Classification ····························································································· 1-4
Priority Trust Mode ······························································································· 1-5
Protocol Priority ··································································································· 1-9
Priority Marking ···································································································· 1-9
Traffic Policing ····································································································· 1-9
Line Rate ··········································································································· 1-11
Traffic Redirecting ······························································································ 1-11
VLAN Mapping ··································································································· 1-11
Queue Scheduling ······························································································ 1-11
Congestion Avoidance ························································································ 1-14
Flow-based Traffic Accounting ············································································ 1-15
Burst ·················································································································· 1-15
Traffic mirroring ································································································· 1-16
QoS Configuration ···································································································· 1-16
Configuring Priority Trust Mode ·········································································· 1-16
Configuring the Mapping between 802.1p Priority and Local Precedence·············· 1-17
Setting the Priority of Protocol Packets ······························································· 1-18
Marking Packet Priority······················································································· 1-19
Configuring Traffic Policing ················································································· 1-20
Configuring Line Rate ························································································· 1-22
Configuring Traffic Redirecting ··········································································· 1-22
Configuring VLAN Mapping ················································································· 1-24
Configuring Queue Scheduling ············································································ 1-24
Configuring WRED ····························································································· 1-26
Configuring Traffic Accounting ············································································ 1-27
Enabling the Burst Function ················································································ 1-28
Configuring Traffic Mirroring ··············································································· 1-28
Displaying and Maintaining QoS ················································································ 1-30
QoS Configuration Examples ···················································································· 1-30
Configuration Example of Traffic policing and Line Rate ······································ 1-30
Configuration Example of Priority Marking and Queue Scheduling ························ 1-31
VLAN Mapping Configuration Example ································································ 1-33
Configuring Traffic Mirroring and Redirecting Traffic to a Port ······························ 1-36
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