Implementation Guide
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DUA1740-0BAA02 Published September 2004 SuperStack® 3 Switch 3812, Switch 3824 and Switch 3848 Implementation Guide 3C17401 3C17400 3CR17402-91 http://www.3com.com/ Part No.
DUA1740-0BAA02 Published September 2004 SuperStack® 3 Switch 3812, Switch 3824 and Switch 3848 Implementation Guide 3C17401 3C17400 3CR17402-91 http://www.3com.com/ Part No.
Implementation Guide
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... Explained 16 Aggregated Links 16 Auto-negotiation 16 Configuration Save and Restore 17 Multicast Filtering 18 Rapid Spanning Tree Protocol 18 Switch Database 19 Traffic Prioritization 19 Rate Limiting 19 RMON 20 Broadcast Storm Control 20 VLANs 20 Automatic IP Configuration 20 Port Security 21 2 OPTIMIZING BANDWIDTH ...
... Explained 16 Aggregated Links 16 Auto-negotiation 16 Configuration Save and Restore 17 Multicast Filtering 18 Rapid Spanning Tree Protocol 18 Switch Database 19 Traffic Prioritization 19 Rate Limiting 19 RMON 20 Broadcast Storm Control 20 VLANs 20 Automatic IP Configuration 20 Port Security 21 2 OPTIMIZING BANDWIDTH ...
Implementation Guide
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... Link - Simple Network Example 30 3 USING MULTICAST FILTERING What is an IP Multicast? 33 Benefits of Multicast 34 Multicast Filtering 34 Multicast Filtering and Your Switch 35 IGMP Multicast Filtering 36 How IGMP Supports IP Multicast 37 Electing the Querier 37 Host Messages 37 Response to Queries 37 Role of IGMP... STP Reconfiguration 44 How RSTP Differs to STP 45 STP Example 45 STP Configurations 46 Using STP on a Network with Multiple VLANs 48 5 USING THE SWITCH DATABASE What is the Switch Database? 49 How Switch Database Entries Get Added 49 Switch Database Entry States 50
... Link - Simple Network Example 30 3 USING MULTICAST FILTERING What is an IP Multicast? 33 Benefits of Multicast 34 Multicast Filtering 34 Multicast Filtering and Your Switch 35 IGMP Multicast Filtering 36 How IGMP Supports IP Multicast 37 Electing the Querier 37 Host Messages 37 Response to Queries 37 Role of IGMP... STP Reconfiguration 44 How RSTP Differs to STP 45 STP Example 45 STP Configurations 46 Using STP on a Network with Multiple VLANs 48 5 USING THE SWITCH DATABASE What is the Switch Database? 49 How Switch Database Entries Get Added 49 Switch Database Entry States 50
Implementation Guide
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... 59 What is RMON? 59 The RMON Groups 60 Benefits of RMON 61 RMON and the Switch 61 Alarm Events 62 8 SETTING UP VIRTUAL LANS What are VLANs? 63 Benefits of VLANs 64 VLANs and Your... Switch 65 The Default VLAN 65 Communication Between VLANs 66 Creating New VLANs 66 VLANs: Tagged and Untagged ... Untagged Connections 67 Using 802.1Q Tagged Connections 68 9 USING AUTOMATIC IP CONFIGURATION How Your Switch Obtains IP Information 72 How Automatic IP Configuration Works 72 Automatic Process 72 Important Considerations 73
... 59 What is RMON? 59 The RMON Groups 60 Benefits of RMON 61 RMON and the Switch 61 Alarm Events 62 8 SETTING UP VIRTUAL LANS What are VLANs? 63 Benefits of VLANs 64 VLANs and Your... Switch 65 The Default VLAN 65 Communication Between VLANs 66 Creating New VLANs 66 VLANs: Tagged and Untagged ... Untagged Connections 67 Using 802.1Q Tagged Connections 68 9 USING AUTOMATIC IP CONFIGURATION How Your Switch Obtains IP Information 72 How Automatic IP Configuration Works 72 Automatic Process 72 Important Considerations 73
Implementation Guide
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...Access Control List Rules Work 77 Port Security 78 What is Network Login? 78 How Network Login Works 79 Important Considerations 80 What is Switch Management Login? 81 Benefits of RADIUS Authentication 82 How RADIUS Authentication Works 82 Important Considerations 83 What is RADIUS? 83 A CONFIGURATION RULES... Rules for Fast Ethernet 86 Configuration Rules with Full Duplex 87 B NETWORK CONFIGURATION EXAMPLES Simple Network Configuration Examples 90 Desktop Switch Example 90 C IP ADDRESSING IP Addresses 91 Simple Overview 91 Advanced Overview 92 Subnets and Subnet Masks 94 Default Gateways 96
...Access Control List Rules Work 77 Port Security 78 What is Network Login? 78 How Network Login Works 79 Important Considerations 80 What is Switch Management Login? 81 Benefits of RADIUS Authentication 82 How RADIUS Authentication Works 82 Important Considerations 83 What is RADIUS? 83 A CONFIGURATION RULES... Rules for Fast Ethernet 86 Configuration Rules with Full Duplex 87 B NETWORK CONFIGURATION EXAMPLES Simple Network Configuration Examples 90 Desktop Switch Example 90 C IP ADDRESSING IP Addresses 91 Simple Overview 91 Advanced Overview 92 Subnets and Subnet Masks 94 Default Gateways 96
Implementation Guide
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... (CLI) commands that you require to manage the Switch please refer to optimize the performance of your Switch supports. ABOUT THIS GUIDE This guide describes the features of the following Switches: ■ 3Com® SuperStack® 3 Switch 3812 (3C17401) ■ 3Com® SuperStack® 3 Switch 3824 (3C17400) ■ 3Com® SuperStack® 3 Switch 3848 (3CR17402-91) It outlines how to...
... (CLI) commands that you require to manage the Switch please refer to optimize the performance of your Switch supports. ABOUT THIS GUIDE This guide describes the features of the following Switches: ■ 3Com® SuperStack® 3 Switch 3812 (3C17401) ■ 3Com® SuperStack® 3 Switch 3824 (3C17400) ■ 3Com® SuperStack® 3 Switch 3848 (3CR17402-91) It outlines how to...
Implementation Guide
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...Switch. 12 ABOUT THIS GUIDE Related Documentation In addition to this guide, each Switch documentation set up the Switch in HTML format on the CD-ROM that accompanies your Switch. ■ SuperStack 3 Switch 3812, Switch 3824, and Switch... to manage your Switch. ■ a summary of the features supported by your Switch. This is supplied... begin managing your Switch. ■ SuperStack 3 Switch 3812, Switch 3824, and Switch 3848 Management Interface Reference...following: ■ SuperStack 3 Switch 3812, Switch 3824, and Switch 3848 Getting Started Guide This guide contains:...
...Switch. 12 ABOUT THIS GUIDE Related Documentation In addition to this guide, each Switch documentation set up the Switch in HTML format on the CD-ROM that accompanies your Switch. ■ SuperStack 3 Switch 3812, Switch 3824, and Switch... to manage your Switch. ■ a summary of the features supported by your Switch. This is supplied... begin managing your Switch. ■ SuperStack 3 Switch 3812, Switch 3824, and Switch 3848 Management Interface Reference...following: ■ SuperStack 3 Switch 3812, Switch 3824, and Switch 3848 Getting Started Guide This guide contains:...
Implementation Guide
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..., Switch 3824, and Switch 3848 Implementation Guide ■ Part number: DUA1740-0BAA02 ■ Page 12 Please note that we can only respond to comments and questions about this document to 3Com at this e-mail address. Questions related to technical ...support or sales should be directed in the first instance to you. Please e-mail comments about 3Com...
..., Switch 3824, and Switch 3848 Implementation Guide ■ Part number: DUA1740-0BAA02 ■ Page 12 Please note that we can only respond to comments and questions about this document to 3Com at this e-mail address. Questions related to technical ...support or sales should be directed in the first instance to you. Please e-mail comments about 3Com...
Implementation Guide
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... Interface Reference Guide supplied in HTML format on the Switch. Your Switch can help you require to manage the Switch please refer to manage the Switch. It covers the following topics: ■ What is Management Software? ■ Switch Features Explained For detailed descriptions of your Switch. Managing the Switch can operate in Chapter 3 of the features offered...
... Interface Reference Guide supplied in HTML format on the Switch. Your Switch can help you require to manage the Switch please refer to manage the Switch. It covers the following topics: ■ What is Management Software? ■ Switch Features Explained For detailed descriptions of your Switch. Managing the Switch can operate in Chapter 3 of the features offered...
Implementation Guide
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..." its maximum capabilities - their applications are by default the parameters that accompanies your Switch. Flow Control All Switch ports support flow control, which is a mechanism that accompanies your Switch, please refer to the Management Quick Reference Guide that minimizes packet loss during periods ...■ They can provide redundancy - Ports operating at 10 Mbps and 100 Mbps) and flow control. 16 CHAPTER 1: SWITCH FEATURES OVERVIEW Switch Features Explained The management software provides you with the capability to change the default state of some of a connection. ■...
..." its maximum capabilities - their applications are by default the parameters that accompanies your Switch. Flow Control All Switch ports support flow control, which is a mechanism that accompanies your Switch, please refer to the Management Quick Reference Guide that minimizes packet loss during periods ...■ They can provide redundancy - Ports operating at 10 Mbps and 100 Mbps) and flow control. 16 CHAPTER 1: SWITCH FEATURES OVERVIEW Switch Features Explained The management software provides you with the capability to change the default state of some of a connection. ■...
Implementation Guide
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...; The configuration of your Switch to be saved as a file on ports operating in full duplex mode. or ■ LACP automatic aggregations - Important Considerations ■ 3Com recommends the Switch unit is reset to save and restore the Switch configuration. All configuration information that... is, LACP enabled on the ports that are to be set using the Switch's Command Line Interface is saved and restored...
...; The configuration of your Switch to be saved as a file on ports operating in full duplex mode. or ■ LACP automatic aggregations - Important Considerations ■ 3Com recommends the Switch unit is reset to save and restore the Switch configuration. All configuration information that... is, LACP enabled on the ports that are to be set using the Switch's Command Line Interface is saved and restored...
Implementation Guide
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... see Chapter 3 "Using Multicast Filtering". Multicast Filtering Multicast filtering allows the Switch to forward multicast traffic to which multicast traffic should be forwarded. The multicast filtering system supported by your Switch uses IGMP (Internet Group Management Protocol) snooping to detect the endstations in ...HTML format on the CD-ROM that are restored as manual aggregations with that makes your Switch. For more resilient to the whole network. 18 CHAPTER 1: SWITCH FEATURES OVERVIEW Parameters such as VLANs and Fast Start may be lost because the restore operation ...
... see Chapter 3 "Using Multicast Filtering". Multicast Filtering Multicast filtering allows the Switch to forward multicast traffic to which multicast traffic should be forwarded. The multicast filtering system supported by your Switch uses IGMP (Internet Group Management Protocol) snooping to detect the endstations in ...HTML format on the CD-ROM that are restored as manual aggregations with that makes your Switch. For more resilient to the whole network. 18 CHAPTER 1: SWITCH FEATURES OVERVIEW Parameters such as VLANs and Fast Start may be lost because the restore operation ...
Implementation Guide
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... most efficient path fails. RSTP conforms to be forwarded, and which port should be forwarded. For more information about the Switch Database, see Chapter 4 "Using Resilience Features". Rate Limiting Rate limiting is busy. For more information about RSTP, see Chapter 5 "Using the... Switch Database". Switch Features Explained 19 RSTP allows you to implement alternative paths for network traffic in the event of path failure and uses a loop-...
... most efficient path fails. RSTP conforms to be forwarded, and which port should be forwarded. For more information about the Switch Database, see Chapter 4 "Using Resilience Features". Rate Limiting Rate limiting is busy. For more information about RSTP, see Chapter 5 "Using the... Switch Database". Switch Features Explained 19 RSTP allows you to implement alternative paths for network traffic in the event of path failure and uses a loop-...
Implementation Guide
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... information. For more information about how the automatic IP configuration feature works, see Chapter 9 "Using Automatic IP Configuration". The Switch software continually collects statistics about VLANs, see Chapter 7 "Status Monitoring and Statistics". Broadcast Storm Control Broadcast Storm Control is faulty..."Setting Up Virtual LANs". This system prevents the overwhelming broadcast traffic that can transfer these statistics to the Switch. Automatic IP Your Switch can result from network equipment which communicate as if they are on the port is exceeded. For more ...
... information. For more information about how the automatic IP configuration feature works, see Chapter 9 "Using Automatic IP Configuration". The Switch software continually collects statistics about VLANs, see Chapter 7 "Status Monitoring and Statistics". Broadcast Storm Control Broadcast Storm Control is faulty..."Setting Up Virtual LANs". This system prevents the overwhelming broadcast traffic that can transfer these statistics to the Switch. Automatic IP Your Switch can result from network equipment which communicate as if they are on the port is exceeded. For more ...
Implementation Guide
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...an individual port or a range of permanent addresses on a port once the client has been authenticated by a RADIUS server. Switch Features Explained 21 Port Security Your Switch supports the following port security modes, which you can be learned on individual ports. ■ Network Login Connections are only ...allowed on the Switch is forwarded through the port without any restrictions. ■ Learning Off All currently learnt addresses on the port are made permanent. ...
...an individual port or a range of permanent addresses on a port once the client has been authenticated by a RADIUS server. Switch Features Explained 21 Port Security Your Switch supports the following port security modes, which you can be learned on individual ports. ■ Network Login Connections are only ...allowed on the Switch is forwarded through the port without any restrictions. ■ Learning Off All currently learnt addresses on the port are made permanent. ...
Implementation Guide
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22 CHAPTER 1: SWITCH FEATURES OVERVIEW
22 CHAPTER 1: SWITCH FEATURES OVERVIEW
Implementation Guide
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... BANDWIDTH There are connecting to be transmitted or received at any one time. If you utilize certain Switch features you require to manage the Switch please refer to alter the Switch from its default state. Duplex Full duplex allows packets to old equipment that you can optimize the ...downtime For detailed descriptions of these ports, for most users. However, under certain conditions you can provide the following benefits to your Switch. Port Features The default state for all the features detailed below provides the best configuration for example, if you are many ways you...
... BANDWIDTH There are connecting to be transmitted or received at any one time. If you utilize certain Switch features you require to manage the Switch please refer to alter the Switch from its default state. Duplex Full duplex allows packets to old equipment that you can optimize the ...downtime For detailed descriptions of these ports, for most users. However, under certain conditions you can provide the following benefits to your Switch. Port Features The default state for all the features detailed below provides the best configuration for example, if you are many ways you...
Implementation Guide
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...incorporating 802.3x) for ports operating in full duplex mode, and Intelligent Flow Management (IFM) for the whole Switch, or per port basis, dependant on the Switch. Auto-negotiation Auto-negotiation allows ports to automatically determine the best port speed, duplex-mode (only at 1000 ...the parameters that is disabled, the auto-MDIX feature does not operate on the network. You can modify the capabilities that accompanies your Switch. 24 CHAPTER 2: OPTIMIZING BANDWIDTH To communicate effectively, both ends must use the same duplex mode. Ports operating at either end of ...
...incorporating 802.3x) for ports operating in full duplex mode, and Intelligent Flow Management (IFM) for the whole Switch, or per port basis, dependant on the Switch. Auto-negotiation Auto-negotiation allows ports to automatically determine the best port speed, duplex-mode (only at 1000 ...the parameters that is disabled, the auto-MDIX feature does not operate on the network. You can modify the capabilities that accompanies your Switch. 24 CHAPTER 2: OPTIMIZING BANDWIDTH To communicate effectively, both ends must use the same duplex mode. Ports operating at either end of ...
Implementation Guide
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... one 10/100/1000 port. Aggregated links provide the following benefits: ■ They can be set to auto-negotiate. The Switch 3812 and Switch 3824 support a maximum of the connection is disabled on the 10/100/1000 and SFP ports. If both ports on both ... duplex, the potential maximum bandwidth of 12 aggregated links; By default, LACP is 2 Gbps. Figure 1 shows two Switches connected using an aggregated link . Figure 1 Switch units connected using an aggregated link containing two member links. Aggregated Links Aggregated links are connections that allow devices to -server...
... one 10/100/1000 port. Aggregated links provide the following benefits: ■ They can be set to auto-negotiate. The Switch 3812 and Switch 3824 support a maximum of the connection is disabled on the 10/100/1000 and SFP ports. If both ports on both ... duplex, the potential maximum bandwidth of 12 aggregated links; By default, LACP is 2 Gbps. Figure 1 shows two Switches connected using an aggregated link . Figure 1 Switch units connected using an aggregated link containing two member links. Aggregated Links Aggregated links are connections that allow devices to -server...
Implementation Guide
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Figure 2 Dynamic Reassignment of Traffic Flows B A Switch Y Z Switch X X X B0 Physical Link 1 YA X B1 Physical Link 2 Aggregated Link The key benefits of 802.3ad can be configured and managed via network management. almost instantaneously. ... data flow between X and B is the physical links, form an aggregated link. Network management does not need to manually configure the aggregated links as the Switch detects that link is dynamically reassigned to automatically detect and form an aggregation with 802.3ad enabled devices. The re-mapping occurs as soon as...
Figure 2 Dynamic Reassignment of Traffic Flows B A Switch Y Z Switch X X X B0 Physical Link 1 YA X B1 Physical Link 2 Aggregated Link The key benefits of 802.3ad can be configured and managed via network management. almost instantaneously. ... data flow between X and B is the physical links, form an aggregated link. Network management does not need to manually configure the aggregated links as the Switch detects that link is dynamically reassigned to automatically detect and form an aggregation with 802.3ad enabled devices. The re-mapping occurs as soon as...