Configuration Guide
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Catalyst 3750 Switch Software Configuration Guide Cisco IOS Release 12.2(35)SE December 2006 Corporate Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 526-4100 Text Part Number: OL-8550-02
Catalyst 3750 Switch Software Configuration Guide Cisco IOS Release 12.2(35)SE December 2006 Corporate Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 526-4100 Text Part Number: OL-8550-02
Configuration Guide
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...Obtaining Documentation xlvi Cisco.com xlvi Product Documentation DVD xlvi Ordering Documentation xlvi Documentation Feedback xlvii Cisco Product Security Overview xlvii Reporting Security Problems in Cisco Products xlvii Product Alerts and Field Notices xlviii Obtaining Technical Assistance xlviii Cisco Support Website ... 1-6 VLAN Features 1-7 Security Features 1-8 QoS and CoS Features 1-9 Layer 3 Features 1-11 Power over Ethernet Features 1-12 Monitoring Features 1-12 Default Settings After Initial Switch Configuration 1-12 CONTENTS Catalyst 3750 Switch Software Configuration Guide iii
...Obtaining Documentation xlvi Cisco.com xlvi Product Documentation DVD xlvi Ordering Documentation xlvi Documentation Feedback xlvii Cisco Product Security Overview xlvii Reporting Security Problems in Cisco Products xlvii Product Alerts and Field Notices xlviii Obtaining Technical Assistance xlviii Cisco Support Website ... 1-6 VLAN Features 1-7 Security Features 1-8 QoS and CoS Features 1-9 Layer 3 Features 1-11 Power over Ethernet Features 1-12 Monitoring Features 1-12 Default Settings After Initial Switch Configuration 1-12 CONTENTS Catalyst 3750 Switch Software Configuration Guide iii
Configuration Guide
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... the Filename to Read and Write the System Configuration 3-12 Booting Manually 3-13 Booting a Specific Software Image 3-14 Controlling Environment Variables 3-15 Scheduling a Reload of the Software Image 3-16 Configuring a Scheduled Reload 3-17 Displaying Scheduled Reload Information 3-18 Configuring Cisco IOS CNS Agents 4-1 Understanding Cisco Configuration Engine Software 4-1 Configuration Service 4-2 Event Service 4-3 NameSpace Mapper...
... the Filename to Read and Write the System Configuration 3-12 Booting Manually 3-13 Booting a Specific Software Image 3-14 Controlling Environment Variables 3-15 Scheduling a Reload of the Software Image 3-16 Configuring a Scheduled Reload 3-17 Displaying Scheduled Reload Information 3-18 Configuring Cisco IOS CNS Agents 4-1 Understanding Cisco Configuration Engine Software 4-1 Configuration Service 4-2 Event Service 4-3 NameSpace Mapper...
Configuration Guide
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... Agents 4-6 Enabling Automated CNS Configuration 4-6 Enabling the CNS Event Agent 4-8 Enabling the Cisco IOS CNS Agent 4-9 Enabling an Initial Configuration 4-9 Enabling a Partial Configuration 4-11 Displaying CNS Configuration 4-12 Managing Switch Stacks 5-1 Understanding Switch Stacks 5-1 Switch Stack Membership 5-3 Stack Master Election and Re-Election 5-4 Switch Stack Bridge ID and... Connectivity to the Switch Stack Through Console Ports 5-16 Connectivity to Specific Stack Members 5-17 Switch Stack Configuration Scenarios 5-17 Catalyst 3750 Switch Software Configuration Guide vi OL-8550-02
... Agents 4-6 Enabling Automated CNS Configuration 4-6 Enabling the CNS Event Agent 4-8 Enabling the Cisco IOS CNS Agent 4-9 Enabling an Initial Configuration 4-9 Enabling a Partial Configuration 4-11 Displaying CNS Configuration 4-12 Managing Switch Stacks 5-1 Understanding Switch Stacks 5-1 Switch Stack Membership 5-3 Stack Master Election and Re-Election 5-4 Switch Stack Bridge ID and... Connectivity to the Switch Stack Through Console Ports 5-16 Connectivity to Specific Stack Members 5-17 Switch Stack Configuration Scenarios 5-17 Catalyst 3750 Switch Software Configuration Guide vi OL-8550-02
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...6-9 HSRP and Standby Cluster Command Switches 6-10 Virtual IP Addresses 6-11 Other Considerations for Cluster Standby Groups 6-11 Automatic Recovery of Cluster Configuration 6-12 IP Addresses 6-13 Hostnames 6-13 Passwords 6-14 SNMP Community Strings 6-14 Switch Clusters and Switch Stacks 6-15 TACACS+ and RADIUS 6-16 LRE... Profiles 6-16 Using the CLI to Manage Switch Clusters 6-16 Catalyst 1900 and Catalyst 2820 CLI Considerations 6-17 Using SNMP to Manage Switch Clusters 6-17 OL-8550-02 Catalyst 3750 Switch Software Configuration Guide vii
...6-9 HSRP and Standby Cluster Command Switches 6-10 Virtual IP Addresses 6-11 Other Considerations for Cluster Standby Groups 6-11 Automatic Recovery of Cluster Configuration 6-12 IP Addresses 6-13 Hostnames 6-13 Passwords 6-14 SNMP Community Strings 6-14 Switch Clusters and Switch Stacks 6-15 TACACS+ and RADIUS 6-16 LRE... Profiles 6-16 Using the CLI to Manage Switch Clusters 6-16 Catalyst 1900 and Catalyst 2820 CLI Considerations 6-17 Using SNMP to Manage Switch Clusters 6-17 OL-8550-02 Catalyst 3750 Switch Software Configuration Guide vii
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... 7-10 Displaying the NTP Configuration 7-11 Configuring Time and Date Manually 7-11 Setting the System Clock 7-11 Displaying the Time and Date Configuration 7-12 Configuring the Time Zone 7-12 Configuring Summer Time (Daylight Saving Time) 7-13 Configuring a System Name and Prompt 7-14 Default System Name and Prompt Configuration 7-15 Configuring a ... Configuring MAC Address Notification Traps 7-22 Adding and Removing Static Address Entries 7-24 Configuring Unicast MAC Address Filtering 7-25 Displaying Address Table Entries 7-27 Catalyst 3750 Switch Software Configuration Guide viii OL-8550-02
... 7-10 Displaying the NTP Configuration 7-11 Configuring Time and Date Manually 7-11 Setting the System Clock 7-11 Displaying the Time and Date Configuration 7-12 Configuring the Time Zone 7-12 Configuring Summer Time (Daylight Saving Time) 7-13 Configuring a System Name and Prompt 7-14 Default System Name and Prompt Configuration 7-15 Configuring a ... Configuring MAC Address Notification Traps 7-22 Adding and Removing Static Address Entries 7-24 Configuring Unicast MAC Address Filtering 7-25 Displaying Address Table Entries 7-27 Catalyst 3750 Switch Software Configuration Guide viii OL-8550-02
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...9-9 Logging into and Exiting a Privilege Level 9-9 Controlling Switch Access with TACACS+ 9-10 Understanding TACACS+ 9-10 TACACS+ Operation 9-12 Configuring TACACS+ 9-12 Default TACACS+ Configuration 9-13 Identifying the TACACS+ ...Server Host and Setting the Authentication Key 9-13 Configuring TACACS+ Login Authentication 9-14 Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services 9-16 Starting TACACS+ Accounting 9-17 Displaying the TACACS+ Configuration 9-17 OL-8550-02 Catalyst...
...9-9 Logging into and Exiting a Privilege Level 9-9 Controlling Switch Access with TACACS+ 9-10 Understanding TACACS+ 9-10 TACACS+ Operation 9-12 Configuring TACACS+ 9-12 Default TACACS+ Configuration 9-13 Identifying the TACACS+ ...Server Host and Setting the Authentication Key 9-13 Configuring TACACS+ Login Authentication 9-14 Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services 9-16 Starting TACACS+ Accounting 9-17 Displaying the TACACS+ Configuration 9-17 OL-8550-02 Catalyst...
Configuration Guide
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... the Interface Speed and Duplex Parameters 11-18 Configuring IEEE 802.3x Flow Control 11-19 Configuring Auto-MDIX on an Interface 11-20 Configuring a Power ...12-1 Understanding Smartports Macros 12-1 Configuring Smartports Macros 12-2 Default Smartports Macro Configuration 12-2 Smartports Macro Configuration Guidelines 12-3 Creating Smartports Macros 12-4 Applying Smartports Macros 12-5 Applying Cisco-Default Smartports Macros 12-6 Displaying Smartports Macros 12-8 Configuring VLANs 13-1 Understanding VLANs 13-1 Supported VLANs 13-2 VLAN Port Membership Modes 13-3 Contents OL-8550-02 Catalyst...
... the Interface Speed and Duplex Parameters 11-18 Configuring IEEE 802.3x Flow Control 11-19 Configuring Auto-MDIX on an Interface 11-20 Configuring a Power ...12-1 Understanding Smartports Macros 12-1 Configuring Smartports Macros 12-2 Default Smartports Macro Configuration 12-2 Smartports Macro Configuration Guidelines 12-3 Creating Smartports Macros 12-4 Applying Smartports Macros 12-5 Applying Cisco-Default Smartports Macros 12-6 Displaying Smartports Macros 12-8 Configuring VLANs 13-1 Understanding VLANs 13-1 Supported VLANs 13-2 VLAN Port Membership Modes 13-3 Contents OL-8550-02 Catalyst...
Configuration Guide
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... or Modifying an Ethernet VLAN 13-9 Deleting a VLAN 13-10 Assigning Static-Access Ports to a VLAN 13-11 Configuring Extended-Range VLANs 13-12 Default VLAN Configuration 13-12 Extended-Range VLAN Configuration Guidelines 13-13 Creating an Extended-Range VLAN 13-14 Creating an Extended-Range VLAN with an Internal VLAN... VMPS 13-28 Understanding VMPS 13-28 Dynamic-Access Port VLAN Membership 13-29 Default VMPS Client Configuration 13-29 VMPS Configuration Guidelines 13-29 Catalyst 3750 Switch Software Configuration Guide xiv OL-8550-02
... or Modifying an Ethernet VLAN 13-9 Deleting a VLAN 13-10 Assigning Static-Access Ports to a VLAN 13-11 Configuring Extended-Range VLANs 13-12 Default VLAN Configuration 13-12 Extended-Range VLAN Configuration Guidelines 13-13 Creating an Extended-Range VLAN 13-14 Creating an Extended-Range VLAN with an Internal VLAN... VMPS 13-28 Understanding VMPS 13-28 Dynamic-Access Port VLAN Membership 13-29 Default VMPS Client Configuration 13-29 VMPS Configuration Guidelines 13-29 Catalyst 3750 Switch Software Configuration Guide xiv OL-8550-02
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... Names 14-8 Passwords 14-8 VTP Version 14-9 Configuration Requirements 14-9 Configuring a VTP Server 14-9 Configuring a VTP Client 14-11 Disabling VTP (VTP Transparent Mode) 14-12 Enabling VTP Version 2 14-13 Enabling VTP Pruning 14-14 Adding a VTP Client Switch to a VTP Domain 14-14 Monitoring VTP 14-16 Contents OL...
... Names 14-8 Passwords 14-8 VTP Version 14-9 Configuration Requirements 14-9 Configuring a VTP Server 14-9 Configuring a VTP Client 14-11 Disabling VTP (VTP Transparent Mode) 14-12 Enabling VTP Version 2 14-13 Enabling VTP Pruning 14-14 Adding a VTP Client Switch to a VTP Domain 14-14 Monitoring VTP 14-16 Contents OL...
Configuration Guide
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...Configuring Voice VLAN 15-3 Default Voice VLAN Configuration 15-3 Voice VLAN Configuration Guidelines 15-3 Configuring a Port Connected to a Cisco 7960 IP Phone 15-4 Configuring Cisco IP Phone Voice Traffic 15-5 Configuring the Priority of Incoming Data Frames 15-6 Displaying Voice VLAN 15-6 Configuring Private ...Other Features 16-9 Configuring and Associating VLANs in a Private VLAN 16-10 Configuring a Layer 2 Interface as a Private-VLAN Host Port 16-12 Configuring a Layer 2 Interface as a Private-VLAN Promiscuous Port 16-13 Mapping Secondary VLANs to a Primary VLAN Layer 3 VLAN Interface 16-14...
...Configuring Voice VLAN 15-3 Default Voice VLAN Configuration 15-3 Voice VLAN Configuration Guidelines 15-3 Configuring a Port Connected to a Cisco 7960 IP Phone 15-4 Configuring Cisco IP Phone Voice Traffic 15-5 Configuring the Priority of Incoming Data Frames 15-6 Displaying Voice VLAN 15-6 Configuring Private ...Other Features 16-9 Configuring and Associating VLANs in a Private VLAN 16-10 Configuring a Layer 2 Interface as a Private-VLAN Host Port 16-12 Configuring a Layer 2 Interface as a Private-VLAN Promiscuous Port 16-13 Mapping Secondary VLANs to a Primary VLAN Layer 3 VLAN Interface 16-14...
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... 17-6 Understanding Layer 2 Protocol Tunneling 17-7 Configuring Layer 2 Protocol Tunneling 17-10 Default Layer 2 Protocol Tunneling Configuration 17-11 Layer 2 Protocol Tunneling Configuration Guidelines 17-12 Configuring Layer 2 Protocol Tunneling 17-13 Configuring Layer 2 Tunneling for EtherChannels 17-14 Configuring the SP Edge Switch 17-14 Configuring the Customer Switch 17... Instances 18-10 Spanning-Tree Interoperability and Backward Compatibility 18-11 STP and IEEE 802.1Q Trunks 18-11 VLAN-Bridge Spanning Tree 18-11 Catalyst 3750 Switch Software Configuration Guide xvii
... 17-6 Understanding Layer 2 Protocol Tunneling 17-7 Configuring Layer 2 Protocol Tunneling 17-10 Default Layer 2 Protocol Tunneling Configuration 17-11 Layer 2 Protocol Tunneling Configuration Guidelines 17-12 Configuring Layer 2 Protocol Tunneling 17-13 Configuring Layer 2 Tunneling for EtherChannels 17-14 Configuring the SP Edge Switch 17-14 Configuring the Customer Switch 17... Instances 18-10 Spanning-Tree Interoperability and Backward Compatibility 18-11 STP and IEEE 802.1Q Trunks 18-11 VLAN-Bridge Spanning Tree 18-11 Catalyst 3750 Switch Software Configuration Guide xvii
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Contents 19 C H A P T E R Spanning Tree and Switch Stacks 18-12 Configuring Spanning-Tree Features 18-12 Default Spanning-Tree Configuration 18-13 Spanning-Tree Configuration Guidelines 18-13 Changing the Spanning-Tree Mode. 18-15 Disabling Spanning Tree 18-16 Configuring ... 802.1D STP 19-9 Understanding RSTP 19-9 Port Roles and the Active Topology 19-9 Rapid Convergence 19-10 Synchronization of Port Roles 19-11 xviii Catalyst 3750 Switch Software Configuration Guide OL-8550-02
Contents 19 C H A P T E R Spanning Tree and Switch Stacks 18-12 Configuring Spanning-Tree Features 18-12 Default Spanning-Tree Configuration 18-13 Spanning-Tree Configuration Guidelines 18-13 Changing the Spanning-Tree Mode. 18-15 Disabling Spanning Tree 18-16 Configuring ... 802.1D STP 19-9 Understanding RSTP 19-9 Port Roles and the Active Topology 19-9 Rapid Convergence 19-10 Synchronization of Port Roles 19-11 xviii Catalyst 3750 Switch Software Configuration Guide OL-8550-02
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Contents 20 C H A P T E R OL-8550-02 Bridge Protocol Data Unit Format and Processing 19-12 Processing Superior BPDU Information 19-13 Processing Inferior BPDU Information 19-13 Topology Changes 19-13 Configuring MSTP Features 19-14 Default MSTP Configuration 19-... 20-10 Understanding Root Guard 20-10 Understanding Loop Guard 20-11 Configuring Optional Spanning-Tree Features 20-11 Default Optional Spanning-Tree Configuration 20-12 Optional Spanning-Tree Configuration Guidelines 20-12 Enabling Port Fast 20-12 Catalyst 3750 Switch Software Configuration Guide xix
Contents 20 C H A P T E R OL-8550-02 Bridge Protocol Data Unit Format and Processing 19-12 Processing Superior BPDU Information 19-13 Processing Inferior BPDU Information 19-13 Topology Changes 19-13 Configuring MSTP Features 19-14 Default MSTP Configuration 19-... 20-10 Understanding Root Guard 20-10 Understanding Loop Guard 20-11 Configuring Optional Spanning-Tree Features 20-11 Default Optional Spanning-Tree Configuration 20-12 Optional Spanning-Tree Configuration Guidelines 20-12 Enabling Port Fast 20-12 Catalyst 3750 Switch Software Configuration Guide xix
Configuration Guide
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... Features and IP Source Guard 22-1 Understanding DHCP Features 22-1 DHCP Server 22-2 DHCP Relay Agent 22-2 DHCP Snooping 22-2 Option-82 Data Insertion 22-3 Cisco IOS DHCP Server Database 22-6 DHCP Snooping Binding Database 22-7 DHCP Snooping and Switch Stacks 22-8 Configuring DHCP Features 22-8 Default DHCP Configuration 22-8 DHCP... Switch Stacks 22-10 Configuring the DHCP Relay Agent 22-11 Specifying the Packet Forwarding Address 22-11 Enabling DHCP Snooping and Option 82 22-12 Catalyst 3750 Switch Software Configuration Guide xx OL-8550-02
... Features and IP Source Guard 22-1 Understanding DHCP Features 22-1 DHCP Server 22-2 DHCP Relay Agent 22-2 DHCP Snooping 22-2 Option-82 Data Insertion 22-3 Cisco IOS DHCP Server Database 22-6 DHCP Snooping Binding Database 22-7 DHCP Snooping and Switch Stacks 22-8 Configuring DHCP Features 22-8 Default DHCP Configuration 22-8 DHCP... Switch Stacks 22-10 Configuring the DHCP Relay Agent 22-11 Specifying the Packet Forwarding Address 22-11 Enabling DHCP Snooping and Option 82 22-12 Catalyst 3750 Switch Software Configuration Guide xx OL-8550-02
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...C H A P T E R OL-8550-02 Enabling DHCP Snooping on Private VLANs 22-14 Enabling the Cisco IOS DHCP Server Database 22-14 Enabling the DHCP Snooping Binding Database Agent 22-15 Displaying DHCP Snooping Information 22... Limiting the Rate of Incoming ARP Packets 23-10 Performing Validation Checks 23-11 Configuring the Log Buffer 23-12 Displaying Dynamic ARP Inspection Information 23-14 Configuring IGMP Snooping and MVR 24-1 Understanding IGMP Snooping 24-2 IGMP ...-Leave Timer 24-6 IGMP Report Suppression 24-6 IGMP Snooping and Switch Stacks 24-7 Catalyst 3750 Switch Software Configuration Guide xxi
...C H A P T E R OL-8550-02 Enabling DHCP Snooping on Private VLANs 22-14 Enabling the Cisco IOS DHCP Server Database 22-14 Enabling the DHCP Snooping Binding Database Agent 22-15 Displaying DHCP Snooping Information 22... Limiting the Rate of Incoming ARP Packets 23-10 Performing Validation Checks 23-11 Configuring the Log Buffer 23-12 Displaying Dynamic ARP Inspection Information 23-14 Configuring IGMP Snooping and MVR 24-1 Understanding IGMP Snooping 24-2 IGMP ...-Leave Timer 24-6 IGMP Report Suppression 24-6 IGMP Snooping and Switch Stacks 24-7 Catalyst 3750 Switch Software Configuration Guide xxi
Configuration Guide
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...Statically to Join a Group 24-11 Enabling IGMP Immediate Leave 24-11 Configuring the IGMP Leave Timer 24-12 Configuring TCN-Related Commands 24-13 Controlling the Multicast Flooding Time After a TCN Event 24-13 Recovering from Flood Mode 24-13 Disabling Multicast ...24-28 Displaying IGMP Filtering and Throttling Configuration 24-29 Configuring Port-Based Traffic Control 25-1 Configuring Storm Control 25-1 Understanding Storm Control 25-1 Default Storm Control Configuration 25-3 Configuring Storm Control and Threshold Levels 25-3 Catalyst 3750 Switch Software Configuration Guide xxii OL-8550-02
...Statically to Join a Group 24-11 Enabling IGMP Immediate Leave 24-11 Configuring the IGMP Leave Timer 24-12 Configuring TCN-Related Commands 24-13 Controlling the Multicast Flooding Time After a TCN Event 24-13 Recovering from Flood Mode 24-13 Disabling Multicast ...24-28 Displaying IGMP Filtering and Throttling Configuration 24-29 Configuring Port-Based Traffic Control 25-1 Configuring Storm Control 25-1 Understanding Storm Control 25-1 Default Storm Control Configuration 25-3 Configuring Storm Control and Threshold Levels 25-3 Catalyst 3750 Switch Software Configuration Guide xxii OL-8550-02
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... Security Configuration 25-10 Port Security Configuration Guidelines 25-10 Enabling and Configuring Port Security 25-12 Enabling and Configuring Port Security Aging 25-15 Port Security and Switch Stacks 25-17 Displaying Port-Based Traffic Control Settings 25-17 Configuring CDP 26-1 Understanding CDP 26-1 CDP and Switch Stacks 26-2 Configuring... 27-4 Configuration Guidelines 27-4 Enabling UDLD Globally 27-5 Enabling UDLD on an Interface 27-6 Resetting an Interface Disabled by UDLD 27-6 Displaying UDLD Status 27-7 Catalyst 3750 Switch Software Configuration Guide xxiii
... Security Configuration 25-10 Port Security Configuration Guidelines 25-10 Enabling and Configuring Port Security 25-12 Enabling and Configuring Port Security Aging 25-15 Port Security and Switch Stacks 25-17 Displaying Port-Based Traffic Control Settings 25-17 Configuring CDP 26-1 Understanding CDP 26-1 CDP and Switch Stacks 26-2 Configuring... 27-4 Configuration Guidelines 27-4 Enabling UDLD Globally 27-5 Enabling UDLD on an Interface 27-6 Resetting an Interface Disabled by UDLD 27-6 Displaying UDLD Status 27-7 Catalyst 3750 Switch Software Configuration Guide xxiii
Configuration Guide
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... RSPAN 28-10 Default SPAN and RSPAN Configuration 28-11 Configuring Local SPAN 28-11 SPAN Configuration Guidelines 28-11 Creating a Local SPAN Session 28-12 Creating a Local SPAN Session and Configuring Incoming Traffic 28-15 Specifying VLANs to Filter 28-16 Configuring RSPAN 28-17 RSPAN Configuration Guidelines 28-18... Alarms and Events 29-3 Collecting Group History Statistics on an Interface 29-5 Collecting Group Ethernet Statistics on an Interface 29-5 Displaying RMON Status 29-6 xxiv Catalyst 3750 Switch Software Configuration Guide OL-8550-02
... RSPAN 28-10 Default SPAN and RSPAN Configuration 28-11 Configuring Local SPAN 28-11 SPAN Configuration Guidelines 28-11 Creating a Local SPAN Session 28-12 Creating a Local SPAN Session and Configuring Incoming Traffic 28-15 Specifying VLANs to Filter 28-16 Configuring RSPAN 28-17 RSPAN Configuration Guidelines 28-18... Alarms and Events 29-3 Collecting Group History Statistics on an Interface 29-5 Collecting Group Ethernet Statistics on an Interface 29-5 Displaying RMON Status 29-6 xxiv Catalyst 3750 Switch Software Configuration Guide OL-8550-02
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... History Table and to SNMP 30-10 Enabling the Configuration-Change Logger 30-11 Configuring UNIX Syslog Servers 30-12 Logging Messages to a UNIX Syslog Daemon 30-12 Configuring the UNIX System Logging Facility 30-13 Displaying the Logging Configuration 30-14 Configuring SNMP 31-1 Understanding SNMP...Guidelines 31-7 Disabling the SNMP Agent 31-8 Configuring Community Strings 31-8 Configuring SNMP Groups and Users 31-10 Configuring SNMP Notifications 31-12 Setting the Agent Contact and Location Information 31-15 Limiting TFTP Servers Used Through SNMP 31-16 SNMP Examples 31-16 Displaying SNMP ...
... History Table and to SNMP 30-10 Enabling the Configuration-Change Logger 30-11 Configuring UNIX Syslog Servers 30-12 Logging Messages to a UNIX Syslog Daemon 30-12 Configuring the UNIX System Logging Facility 30-13 Displaying the Logging Configuration 30-14 Configuring SNMP 31-1 Understanding SNMP...Guidelines 31-7 Disabling the SNMP Agent 31-8 Configuring Community Strings 31-8 Configuring SNMP Groups and Users 31-10 Configuring SNMP Notifications 31-12 Setting the Agent Contact and Location Information 31-15 Limiting TFTP Servers Used Through SNMP 31-16 SNMP Examples 31-16 Displaying SNMP ...