Allied-telesis AT-S39 Manual de usuario Pagina 141
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AT-S39 User’s Guide
141
Class of Service Overview
The AT-8024, AT-8024GB, and AT-8026FC switches support CoS as
specified in the IEEE 802.1p and 802.1Q standards. CoS can be important
in network environments where there are time-critical applications, such
as voice transmission or video conferencing, that can be adversely
affected by packet transfer delays.
Prior to CoS, network traffic was handled in a best-effort manner. File
transfer delays did occur, but were mostly transparent to network users.
But with the introduction of time-critical applications, packet transfer
delays can prove problematic. For example, transfer delays of voice
transmission can result in poor audio quality.
CoS was designed to address this problem. The 802.1p standard outlines
eight levels of priority, 0 to 7, with 0 the lowest priority and 7 the highest.
The AT-8024, AT-8024GB, and AT-8026FC switches have two priority
queues, low and high. When a tagged packet enters a switch port, the
switch responds by placing the packet into one of the two queues
according to following assignments:
IEEE 802.1p AT-8024 and AT-8024GB
Priority Levels Queue
7high
6high
5high
4high
3low
2low
1low
0low
For example, a tagged packet with a priority tag of 6 is placed in the high
priority queue, while a packet with a priority tag of 1 is placed in the low
priority queue.
These priority-to-queue assignments can be overridden using the
AT-S39 management software on a per port basis.
You can also use CoS to control which priority queue handles untagged
frames that ingress a port. By default, untagged frames (i.e., frames
without VLAN or priority level information) are automatically assigned to
the low priority buffer. But you can configure CoS on a port so that all
untagged frames received on the port are directed to the high priority
queue.
- User’s Guide 1
- Table of Contents 3
- Section III 6
- List of Figures 8
- How This Guide is Organized 10
- Document Conventions 11
- Contacting Allied Telesyn 13
- Management Software Updates 14
- Overview 15
- Local Management Session 18
- Telnet Management Session 19
- Section I: Overview 20
- SNMP Management Session 21
- Local and Telnet Management 22
- Starting a Local or Telnet 23
- Starting a Local 25
- Enhanced 27
- Stacking 27
- Local Session 28
- How Do You 33
- Assign an IP 33
- Address? 33
- Enhanced Stacking 46
- Enhanced Stacking Overview 47
- IP Address 49
- Enter new setup (M/S/U) -> 51
- Returning to 53
- Displaying Port Status 55
- 2 - Speed .............. 0100 59
- Displaying Uplink Information 62
- Port Security Overview 65
- Configuring Port Security 67
- Port Trunking 72
- Port Trunking Overview 73
- Creating a Port Trunk 75
- Enter Trunk Port(s) -> 76
- Deleting a Port Trunk 77
- Port Mirroring Overview 79
- Creating a Port Mirror 80
- Deleting a Port Mirror 81
- STP Overview 83
- Redundant 84
- Finding and 84
- Resolving 84
- Configuring STP Port Settings 88
- VLAN Overview 91
- Port-based VLAN Overview 93
- Port-based 95
- Drawbacks to 96
- Example 1 97
- Example 2 98
- (PVID 3) 99
- Ports 21 - 24 (PVID 4) 99
- Tagged VLAN Overview 100
- AT-S39 User’s Guide 101
- General Rules 102
- Tagged VLAN 102
- Basic VLAN Mode Overview 105
- Modifying a VLAN 112
- The VLAN has been modified 115
- Displaying VLAN Information 116
- Deleting a VLAN 117
- Deleting All VLANs 119
- Changing a PVID Value 120
- Setting a Switch’s VLAN Mode 122
- MAC Address Table 127
- MAC Address Overview 128
- Displaying MAC Addresses 130
- Viewing MAC Addresses by Port 133
- XXXXXX XXXXXX 134
- Adding Static MAC Addresses 137
- Deleting MAC Addresses 138
- Changing the Aging Time 139
- Class of Service 140
- Class of Service Overview 141
- Configuring CoS 142
- IGMP Snooping 143
- IGMP Snooping Overview 144
- Activating IGMP Snooping 146
- Broadcast Frame Control 151
- Ethernet Statistics 157
- Displaying Port Statistics 158
- Displaying Switch Statistics 161
- Obtaining Software Updates 164
- Management Session 165
- Return to Previous Menu 166
- Web Browser Management 171
- Starting a Web Browser 172
- Switch’s IP Address 173
- Quitting from a 175
- Web Browser 175
- Management 175
- Basic Switch Parameters 176
- Viewing System Information 182
- Resetting a Switch 186
- Port Parameters 187
- Configuring Port Parameters 188
- Port Security 196
- Port Trunks 198
- Port Mirroring 201
- Spanning Tree Protocol 204
- Virtual LANs 210
- Creating a VLAN 211
- Displaying VLANs 217
- Enabling or Disabling VLANs 219
- Changing a PVID 220
- Viewing the MAC Address Table 223
- Configuring IGMP Snooping 232
- AT-S39 Default Settings 238
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