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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
78-6511-06
Chapter8 Configuring VLANs
Using VTP
VTP Pruning
Pruning increases available bandwidth by restricting flooded traffic to those trunk links that the traffic
must use to reach the destination devices. Without VTP pruning, a switch floods broadcast, multicast,
and unknown unicast traffic across all trunk links within a VTP domain even though receiving switches
might discard them.
VTP pruning blocks unneeded flooded traffic to VLANs on trunk ports that are included in the
pruning-eligible list. Only VLANs included in the pruning-eligible list can be pruned. By default,
VLANs 2 through 1001 are pruning eligible on Catalyst 2900 XL and Catalyst 3500 XL trunk ports. If
the VLANs are configured as pruning-ineligible, the flooding continues. VTP pruning is also supported
with VTP version 1 and version 2.
Figure 8-3 shows a switched network with VTP pruning enabled. The broadcast traffic from Switch 1 is
not forwarded to Switches 3, 5, and 6 because traffic for the Red VLAN has been pruned on the links
indicated (port 5 on Switch 2 and port 4 on Switch 4).
Figure 8-3 Optimized Flooded Traffic with VTP Pruning
Switch 4
Switch 5
Switch 3Switch 6 Switch 1
Catalyst 2900 XL or
Catalyst 3500 XL
Switch 2
Port 1
Port 2
Red
VLAN
30768
Port
4
Port
5
Flooded traffic
is pruned.
Flooded traffic
is pruned.
- Catalyst 2900 Series XL and 1
- Catalyst 3500 Series XL 1
- Software Configuration Guide 1
- CONTENTS 3
- 5 Clustering Switches 5-1 5
- 6 Configuring the System 6-1 6
- 8 Configuring VLANs 8-1 9
- Contents 10
- 78-6511-06 10
- 9 Troubleshooting 9-1 11
- A System Messages A-1 12
- Audience 13
- Organization 14
- Conventions 15
- Related Publications 16
- Obtaining Documentation 17
- Documentation Feedback 18
- Cisco.com 18
- Technical Assistance Center 19
- Chapter 1 Overview 22
- Features 22
- Management Options 25
- Large Campus Configuration 34
- Multidwelling Configuration 36
- Getting Started with CMS 39
- Front Panel view of 41
- Topology view of 41
- Front Panel View 42
- Cluster Tree 43
- Front-Panel Images 44
- Redundant Power System LED 45
- Port Modes and LEDs 46
- 10/100 Ports 49
- 1000BASE-X Ports 49
- VLAN Membership Modes 50
- Topology View 51
- Topology Icons 53
- Device and Link Labels 54
- Colors in the Topology View 55
- Topology Display Options 55
- Menus and Toolbar 56
- Table 2-15 Toolbar Buttons 61
- Front Panel View Popup Menus 62
- Topology View Popup Menus 63
- Device Popup Menus 64
- Interaction Modes 66
- Tool Tips 67
- Online Help 67
- CMS Window Components 68
- Tabs, Lists, and Tables 69
- Icons Used in Windows 69
- Accessing CMS 70
- Verifying Your Changes 72
- Saving Your Changes 72
- Where to Go Next 73
- Getting Started with the CLI 75
- Command Usage Basics 76
- • Change terminal settings 77
- • Perform basic tests 77
- • Display system information 77
- Abbreviating Commands 78
- Redisplaying a Command 79
- Getting Help 79
- Command-Line Error Messages 80
- Accessing the CLI 81
- Saving Configuration Changes 82
- General Switch Administration 83
- Switch Software Releases 84
- Console Port Access 85
- Telnet Access to the CLI 86
- HTTP Access to CMS 87
- Figure 4-1 SNMP Network 89
- Table 4-1 SNMP Operations 89
- Default Settings 90
- Device Management 91
- Performance 92
- Flooding Control 93
- Network Redundancy 93
- Diagnostics 93
- Security 94
- Clustering Switches 95
- Understanding Switch Clusters 96
- Discovery through CDP Hops 99
- Planning a Switch Cluster 100
- Virtual IP Addresses 105
- IP Addresses 107
- Passwords 108
- SNMP Community Strings 108
- Host Names 108
- Access Modes in CMS 109
- Management VLAN 110
- Network Port 110
- Creating a Switch Cluster 111
- Enabling a Command Switch 112
- Adding Member Switches 113
- 2900-LRE-24-1 114
- Verifying a Switch Cluster 117
- Command switch 119
- Trap 1, Trap 2, Trap 3 119
- Member 1 Member 2 Member 3 119
- SNMP Manager 119
- Configuring the System 121
- Changing IP Information 122
- DHCP Client Request Process 124
- Configuring the DHCP Server 125
- Configuring the TFTP Server 125
- Configuring the Relay Device 127
- Obtaining Configuration Files 128
- Example Configuration 129
- Configuring CDP 133
- MAC Addresses and VLANs 135
- MAC Address Notification 137
- Adding Secure Addresses 138
- Removing Secure Addresses 138
- Adding Static Addresses 139
- Removing Static Addresses 139
- Configuring CGMP 140
- Removing Multicast Groups 142
- Configuring IGMP Filtering 143
- Applying IGMP Filters 145
- Configuring MVR 147
- Setting MVR Parameters 150
- Managing the ARP Table 152
- Configuring STP 153
- Disabling STP 154
- Enabling STP UplinkFast 157
- Limitations 159
- Connecting the Stack Ports 160
- Changing the Switch Priority 163
- STP Port States 165
- Changing the Path Cost 166
- Changing the Port Priority 166
- Configuring STP Root Guard 167
- Configuring SNMP 168
- Entering Community Strings 169
- Adding Trap Managers 169
- Configuring TACACS+ 171
- Starting TACACS+ Accounting 174
- Configuring the Switch Ports 175
- Configuring Flooding Controls 178
- Disabling Storm Control 179
- Enabling a Network Port 180
- Disabling a Network Port 181
- Configuring Protected Ports 184
- Enabling Port Security 185
- Disabling Port Security 186
- Configuring SPAN 187
- Configuring Voice Ports 188
- Configuring VLANs 193
- Overview 194
- Management VLANs 195
- VLAN Membership Combinations 198
- Using VTP 201
- Table 8-4 VTP Modes 202
- VTP Advertisements 203
- VTP Version 2 203
- VTP Pruning 204
- VTP Configuration Guidelines 205
- VTP Version 206
- Default VTP Configuration 206
- Configuring VTP 207
- Configuring VTP Client Mode 208
- Enabling VTP Version 2 209
- Disabling VTP Version 2 210
- Enabling VTP Pruning 210
- VLANs in the VTP Database 211
- Default VLAN Configuration 212
- VLAN Configuration Guidelines 212
- Adding a VLAN 215
- Modifying a VLAN 215
- How VLAN Trunks Work 217
- Configuring a Trunk Port 219
- Disabling a Trunk Port 220
- How Class of Service Works 222
- Load Sharing Using STP 223
- How the VMPS Works 227
- VMPS Configuration Guidelines 229
- Default VMPS Configuration 230
- Reconfirming VLAN Memberships 231
- Changing the Retry Count 232
- Troubleshooting 235
- Troubleshooting CMS Sessions 238
- Chapter9 Troubleshooting 240
- Figure 9-1 Cluster View 241
- Problems 242
- Recovery Procedures 245
- System Messages 255
- How to Read System Messages 256
- AAAA Messages 259
- CAPITOLA Messages 261
- CDP Messages 261
- CHASSIS Message 262
- CMP Messages 262
- CPU_NET Message 263
- ENVIRONMENT Messages 263
- FRANK Messages 264
- GBIC_1000BASET Messages 269
- GigaStack Messages 270
- HW_MEMORY Messages 271
- INTERFACE Messages 272
- IP Messages 272
- MAT Messages 273
- MIRROR Messages 274
- MODULES Messages 274
- PERF5_HALT_MSG Message 275
- PM Messages 276
- PMSM Messages 278
- PORT_SECURITY Messages 279
- PRUNING Messages 279
- RAC Message 283
- REGISTORS Messages 283
- RTD Messages 284
- SNMP Messages 285
- SPANTREE Messages 285
- SPANTREE_FAST Messages 288
- SW_VLAN Messages 289
- SYS Messages 291
- TAC Messages 294
- TTYDRIVER Messages 295
- VQPCLIENT Messages 296
- VTP Message 299
- Numerics 301
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