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AT-S39 User’s Guide
116
Drawbacks to
Port-based
VLANs
There are several drawbacks to port-based VLANs:
❑ It is not easy to share network resources, such as servers and
printers, across multiple VLANs. A router or Layer 3 switch must be
added to the network to provide a means for interconnecting the
port-based VLANs.
❑ The introduction of a router into your network could create
security issues from unauthorized access to your network.
❑ A VLAN that spans several switches will require a port on each
switch for the interconnection of the various parts of the VLAN.
For example, a VLAN that spans three switches would require one
port on each switch to interconnect the various sections of the
VLAN. In network configurations where there are many individual
VLANs that span switches, many ports can end up being used
ineffectively just to interconnect the various VLANs.
- User’s Guide 1
- 2002 Allied Telesyn, Inc 2
- Table of Contents 3
- Section III 6
- List of Figures 10
- How This Guide is Organized 11
- Document Conventions 13
- Contacting Allied Telesyn 15
- Management Software Updates 16
- Overview 17
- Section I: Overview 19
- Local Management Session 20
- Telnet Management Session 21
- SNMP Management Session 23
- Management Access Levels 24
- Local and Telnet Management 25
- Starting a Local or Telnet 26
- Starting a Local 28
- Enhanced 31
- Stacking 31
- Local Session 31
- How Do You 36
- Assign an IP 36
- Address? 36
- Configuring the 46
- Passwords 46
- Configuring 47
- Enhanced Stacking Overview 53
- IP Address 55
- Enter new setup (M/S/U) -> 57
- Displaying Port Status 61
- 2 - Speed .............. 0100 65
- Displaying Uplink Information 68
- Port Security Overview 71
- Configuring Port Security 73
- Enter ports list: 76
- Port Trunking 77
- Port Trunking Overview 78
- Distribution 79
- Creating a Port Trunk 84
- Enter Trunk Port(s) -> 85
- Deleting a Port Trunk 86
- Port Mirroring Overview 88
- Creating a Port Mirror 89
- Deleting a Port Mirror 90
- STP and RSTP Overview 92
- Bridge Priority 93
- Edge Port 98
- Mixed STP and 99
- RSTP Networks 99
- Spanning Tree 99
- AT-S39 User’s Guide 100
- Configuring STP 101
- Configuring a 103
- Port’s STP 103
- Settings 103
- Configuring RSTP 105
- Port’s RSTP 107
- Virtual LANs 110
- VLAN Overview 111
- Port-based VLAN Overview 113
- General Rules 115
- Port-based 115
- Drawbacks to 116
- Example 1 117
- Example 2 118
- (PVID 3) 119
- Ports 21 - 24 (PVID 4) 119
- Tagged VLAN Overview 120
- Tagged VLAN 122
- Basic VLAN Mode Overview 125
- Modifying a VLAN 132
- Displaying VLAN Information 135
- Deleting a VLAN 136
- Deleting All VLANs 138
- Changing a PVID Value 139
- Setting a Switch’s VLAN Mode 142
- Specifying a Management VLAN 147
- MAC Address Table 149
- MAC Address Overview 150
- Displaying MAC Addresses 152
- Login Session: Manager 153
- Viewing MAC Addresses by Port 155
- XXXXXX XXXXXX 156
- Deleting MAC Addresses 160
- Changing the Aging Time 161
- Class of Service 162
- Class of Service Overview 163
- Configuring CoS 164
- IGMP Snooping 165
- IGMP Snooping Overview 166
- Activating IGMP Snooping 168
- Broadcast Frame Control 173
- Configuration Changes 177
- [0 to 1023] - > 178
- TACACS+ and RADIUS Protocols 179
- TACACS+ and RADIUS Overview 180
- Ethernet Statistics 188
- Displaying Port Statistics 189
- Displaying Switch Statistics 191
- File Downloads and Uploads 193
- Obtaining Software Updates 195
- Return to Previous Menu 197
- Uploading Files 203
- Management Workstation 205
- Uploading a 206
- Configuration 206
- Web Browser Management 207
- Starting a Web Browser 208
- Management Session 208
- Switch’s IP Address 209
- Quitting from a 211
- Web Browser 211
- Management 211
- Basic Switch Parameters 212
- Viewing System Information 218
- Resetting a Switch 222
- Pinging a Remote System 223
- Enhanced Stacking 225
- Returning to 229
- Port Parameters 230
- Configuring Port Parameters 231
- Port Security 239
- Port Trunks 241
- Port Mirroring 244
- STP and RSTP 247
- Creating a VLAN 260
- Deleting VLANs 264
- Displaying VLANs 265
- Enabling or Disabling VLANs 267
- Changing a PVID 268
- Viewing the MAC Address Table 271
- Configuring IGMP Snooping 280
- AT-S39 Default Settings 293
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