Management Software ® AT-S25 ◆ User’s Guide FOR USE WITH AT-8316F/MT, AT-8316F/VF, AT-8316F/SC, AND AT-8324 FAST ETHERNET SWITCHES VERSION 1.
Copyright 2001 Allied Telesyn International, Corp. 960 Stewart Drive Suite B, Sunnyvale, CA 94085 USA All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesyn International, Corp. Netscape Navigator is a registered trademark of Netscape Communications Corporation. All other product names, company names, logos or other designations mentioned herein are trademarks or registered trademarks of their respective owners.
Table of Contents Preface ...................................................................................................................................................................................................................... 7 Supported Platforms ............................................................................................................................................................................................. 7 Purpose of This Guide ..................................
Table of Contents Chapter 2 Managing a Stack .............................................................................................................................................................................................. 37 Configuring IP Parameters ............................................................................................................................................................................... 38 Configuring Spanning Tree Protocol Parameters .....................
AT-S25 Version 1.4 User’s Guide Chapter 6 Displaying Ethernet Statistics .................................................................................................................................................................. 113 Displaying Statistics for Received Frames ................................................................................................................................................ 114 Displaying Statistics for Transmitted Frames ...................................
Preface This guide contains instructions on how to use the AT-S25 Fast Ethernet Switch software and the Omega management interface to configure and manage your Allied Telesyn AT-8300 Series Fast Ethernet Switches. Supported Platforms Version 1.
❑ AT-A24/SX 1000Base-SX (MT-RJ) Expansion Module ❑ AT-A24/LX 1000Base-LX (MT-RJ) Expansion Module Refer to Appendix C, Supported Platforms, for additional information on the switches and optional expansion modules supported by this version of the AT-S25 management software. Purpose of This Guide This guide is intended for network administrators who are responsible for managing the switches.
AT-S25 Version 1.4 User’s Guide How This Guide is Organized This guide contains the following chapters and appendices: Chapter 1, Getting Started, explains how to start an Omega management session and how to navigate around the Omega menus. Chapter 2, Managing a Stack, describes how to configure the IP parameters for a stack, how to set the STP parameters, and more. Chapter 3, Configuring the Ports, explains how to set port parameters, create port trunks, and configure a port mirror.
Document Conventions This guide uses several conventions that you should become familiar with before you begin to perform the procedures. Note Notes provide additional information. Caution Cautions inform you that performing or omitting a specific action may result in equipment damage or loss of data. Warning Warnings inform you that performing or omitting a specific action may result in bodily injury.
AT-S25 Version 1.4 User’s Guide Where to Find Related Guides The Allied Telesyn web site at www.alliedtelesyn.com contains the most recent documentation and technical information for all of our products. All web-based documentation for this product and other Allied Telesyn products can be downloaded from the web site in PDF format.
Contacting Allied Telesyn You can contact Allied Telesyn technical support by telephone, fax and e-mail. You can also contact technical support online through our web site. Online Support Technical Support and Services Technical Support E-mail Addresses 12 You can request technical support online by filling out the Online Technical Support Form at www.alliedtelesyn.com/forms/support.htm.
AT-S25 Version 1.4 User’s Guide Returning Products Products for return or repair must first be assigned a Return Materials Authorization (RMA) number. A product sent to Allied Telesyn without a RMA number will be returned to the sender at the sender’s expense.
FTP Server If you need a new version of management software for an Allied Telesyn device and you know the file name of the program, you can download the software by connecting directly to our FTP server at ftp://gateway.centre.com. At login, enter ‘anonymous’. Enter your e-mail address for the password as requested by the server at login.
AT-S25 Version 1.4 User’s Guide For Sales or Corporate Information Allied Telesyn International, Corp. 19800 North Creek Parkway, Suite 200 Bothell, WA 98011 Tel: 1 (425) 487-8880 Fax: 1 (425) 489-9191 Allied Telesyn International, Corp.
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Chapter 1 Getting Started This chapter provides an overview of the Omega management interface and contains the procedures for starting a management session on an AT-8300 Series stack.
Overview The Omega management interface is a standard part of the AT-S25 management software. This menu-oriented interface simplifies the task of managing an AT-8300 stack. With it, you can configure and manage all of a stack’s parameters. For instance, you can create VLANs, view performance statistics, and configure port parameters. There are three different ways that you can access the Omega management interface to configure and manage an AT-8300 Series stack.
AT-S25 Version 1.4 User’s Guide Starting a Local Omega Session This section contains the procedure for starting a local Omega session. This type of management session involves connecting a terminal to the RS232 port on the master switch of the stack. To start a local Omega session, perform the following procedure: 1. Connect a terminal or PC with a terminal emulator program to the RS232 port on the master switch. The master switch is the switch assigned the Stack ID value of 1.
Omega Main Menu Figure 1 illustrates an example of the Omega Main Menu. Allied Telesyn AT-8324 Ethernet Switch: 1.4 Main Menu Port status and configuration Ethernet statistics Administration System configuration Traffic/Port Mirroring Virtual LANs/QoS Bridging MAC Address Table Quit Or select a module: > 1 - Switch / Master 2 - Switch / Slave 3 - Switch / Slave 4 - Switch / Slave Figure 1 Omega Main Menu from a Local Session The Main Menu is divided into two parts.
AT-S25 Version 1.4 User’s Guide Note The master switch of the stack has the number 1. All other switches are slave switches. When instructed by this manual to select the master switch, be sure to select switch number 1.
Table 2 explains how to move through and select menu selections if you are using a generic (dumb) terminal. Table 2 Generic (Dumb) Terminal When directed You must To select an option Type the first character of the option you want and then press . If two or more options have matching initial characters, type enough characters for Omega to distinguish your choice from the other options; then press . To guide you, the characters you must type are in uppercase.
AT-S25 Version 1.4 User’s Guide Quitting from a Local Session To quit a local Omega session, select Quit from the Omega Main Menu. You should always be sure to exit from a management session when you are finished managing a stack. This will prevent unauthorized individuals from making changes to a stack’s configuration should you leave your management station unattended.
Starting an Omega Session from a Web Browser This section explains how to start an Omega session from a web browser. Note An AT-8300 stack must have an IP address and subnet mask for you to manage it using a web browser. Initially assigning an IP address to a stack can only be performed from a local Omega management session.
AT-S25 Version 1.4 User’s Guide 3. If prompted for a user name and password, enter “admin” for the user name and enter the Omega password in the Password field. The user name and password prompt appears only if a password has been assigned to the Omega interface. To configure a password, refer to Creating an Omega Password on page 126 in Chapter 7. You cannot change the Omega user name.
Managed Switch At the top of the window is an image of the switch that you are currently managing. This will be an AT-8316F or AT-8324 switch. (The display will not include any expansion modules that might be installed in the switch.) You can click on certain areas of the image to activate windows. Clicking on a port displays the configuration window for the port, which you use to set the port parameters. Clicking on the RS232 port displays the configuration window for the management port.
AT-S25 Version 1.4 User’s Guide Most of the procedures in this guide start by having you select the switch in the stack on which you want to perform the procedure. For example, to display the status of the ports on switch 3, you would first select switch 3 from the bottom of the Main Menu and then choose Port status and configuration. The number of each switch in the menu corresponds to the Stack ID setting on the switch.
Web Links The left portion of the window contains links that take you automatically to relevant web pages at the Allied Telesyn web site. The Online Manual link takes you to Allied Telesyn’s technical communications web page, where you can download product documentation in PDF format. The Technical Support link takes you to Allied Telesyn’s Technical Support web page, where you can learn about the company’s support services.
AT-S25 Version 1.4 User’s Guide Starting a Telnet Management Session To start a Telnet management session, specify the IP address of the AT8300 Series stack with a Telnet utility. You then enter the Omega password, if one has been assigned, after which the Omega Main Menu is displayed, as shown in Figure 1 on page 20. For instructions on using the Telnet utility, refer to the documentation included with the utility.
Starting an SNMP Management Session The final method for managing an AT-8300 Stack from a network management station is by using an SNMP management program, such as HP Openview. This method requires that the switch have an IP address and subnet mask. An SNMP management program will allow you to examine the Management Information Base (MIB) objects on the switch. This method does not employ the AT-S25 management interface.
AT-S25 Version 1.4 User’s Guide Connecting to a Remote Stack If you are managing a stack locally (that is, through the RS232 port on the master switch), you can connect to another stack through the Omega interface and so be able to manage the remote stack, without having to end your local session. To connect to a remote stack from a local session, perform the following procedure: 1. From the Omega Main Menu, select Administration. The Administrator menu is displayed. 2. Select Connect to remote system. 3.
Menu Tree Table 3 lists the menu options in the Omega interface. The table includes a brief function of each selection and the page number of the procedure where the selection is explained. Table 3 Omega Menu Tree Main Menu Selection Menu Selection Page Function 64, 66 Displays and configures the parameter settings for the ports on a switch. Transmit statistics 118 Displays statistics on the number of frames transmitted by a port or a switch.
AT-S25 Version 1.4 User’s Guide Table 3 Omega Menu Tree (continued) Main Menu Selection Menu Selection Page Function Connect to a remote system 31 Enables you to connect to and manage another stack while running a local management session on a stack. Only available via a local session. Ping a remote system 61 Tests the connectivity to another network node. Activity monitor 60 Displays the activity monitor for a switch in a stack.
Table 3 Omega Menu Tree (continued) Main Menu Selection Menu Selection Page Function Enable 76 Enables the port mirroring feature on a switch. Disable 78 Disables the port mirroring feature on a switch. Virtual LAN definitions 98, 105, 106 Displays a list of the VLANs existing on a stack. Also creates and deletes virtual LANs. Assign port priority 108 Assigns frames to one of two priority queues. Assign management port to VLAN 110 Assigns the CPU management port to a VLAN.
AT-S25 Version 1.4 User’s Guide Table 3 Omega Menu Tree (continued) Main Menu Selection Menu Selection Clear static MAC table Page Function 91 Clears all entries from the static MAC address table.
Chapter 2 Managing a Stack The procedures in this chapter show you how to activate and configure many of an AT-8300 stack’s parameters.
Configuring IP Parameters If the AT-8300 stack is in a TCP/IP network and you want to manage the stack remotely with a Telnet utility or a web browser, you must assign the stack a set of IP parameters, including a unique IP address and a subnet mask. You can assign these parameters either one of two ways: ❑ Manually using the Omega interface ❑ Automatically using a BootP or DHCP server.
AT-S25 Version 1.4 User’s Guide To set the IP parameters for a stack, perform the following procedure: 1. From the Main Menu, select any switch in the stack. Note You do not need to select the master switch to set the IP parameters. The parameters, once set, will apply to all switches in the stack. 2. From the Main Menu, select System Configuration. The System Configuration menu shown in Figure 7 is displayed.
3. Select IP Parameters. The IP Parameters window in Figure 8 is displayed.
AT-S25 Version 1.4 User’s Guide 4. Enter or change the parameters as desired. Changes to a parameter take effect immediately on the stack. The parameters in the IP Parameters window are described below: IP address This parameter specifies the IP address of the stack. You must specify an IP address if you intend to remotely manage the stack using a web browser, a Telnet utility, or an SNMP management program.
This password is used as the destination filename when you are using TFTP to update the firmware. This password is different from the Omega password that you can create to prevent unauthorized individuals from using the Omega interface to change a stack’s configuration settings. For instructions on how to download the AT-S25 firmware onto a stack, refer to Chapter 8, Upgrading Switch Software and Configuration Files on page 131.
AT-S25 Version 1.4 User’s Guide Configuring Spanning Tree Protocol Parameters The Spanning Tree Protocol (STP) prevents data loops when multiple or redundant paths exist in extended LANs. Each switch or bridge in a spanning tree domain will: ❑ Determine the best single route to a destination device. ❑ Update other bridges with topology information by periodically sending Bridge Protocol Data Units (BPDUs).
The Bridging menu in Figure 9 is displayed. Figure 9 Bridging Menu 3. Select Port spanning tree configuration. The Port Parameters for the Spanning Tree Protocol window in Figure 10 is displayed. The window lists the ports on the switch and the current STP parameter settings for the ports. Figure 10 is an example of the window.
AT-S25 Version 1.4 User’s Guide 4. To enable or disable STP for all the ports on the switch, select either Enable Spanning Tree for all Ports or Disable Spanning Tree for all Ports. If you enable STP, the Omega interface sets the port priority to the default value of 128 for each port. For port cost, the default values are 100 for a 10 Mbps port, 10 for a 100 Mbps port, and 1 for a 1 Gbps port. 5. To enable or disable STP for a particular port or to change the STP port values, select the port.
7. Change the priority and port cost parameters for the ports, as desired. The parameters are defined below: Priority This parameter is used as a tie breaker when two or more ports are determined to have equal costs to the root bridge. The default value for priority is 128. The range is 0-255. Cost The spanning tree algorithm uses the cost parameter to decide which port provides the lowest cost path to the root bridge for that LAN.
AT-S25 Version 1.4 User’s Guide The Spanning Tree Parameters window in Figure 13 is displayed. Figure 13 Spanning Tree Parameters Window 4. Adjust the settings as desired. The parameters are discussed below. Bridge Priority Bridges use this number to determine the root bridge for a loopfree implementation. If bridges happen to have equal priority values, the bridge with the numerically lowest MAC address becomes the root bridge.
Hello Time Bridges use this parameter to determine the time interval between generating and sending configuration messages. This parameter can be from 1 to 10 seconds. The default is 2 seconds. Forwarding Delay This parameter indicates the waiting period before a bridge changes to a new state, for example, becomes the new root bridge after the topology changes. If the bridge transitions too soon, not all links may have yet adapted to the change; therefore, loops may result. The default is 15 seconds.
AT-S25 Version 1.4 User’s Guide Enabling or Disabling IGMP Snooping An AT-8300 stack supports the Internet Group Management Protocol (IGMP) snooping feature. This feature allows the stack to take advantage of performance improvements provided by IP multicasting. Allied Telesyn’s implementation supports IGMP Version 1.
Naming a Stack This procedure assigns a name to a stack. The name is displayed in all the Omega windows when you manage the stack. To assign a name to a stack, perform the following procedure: 1. From the Main Menu, select any switch in the stack. Note You do not need to select the master switch to assign a name to a stack. Once assigned, a name will apply to all switches in the stack. 2. From the Main Menu, select System Configuration. The System Configuration menu in Figure 7 on page 39 is displayed. 3.
AT-S25 Version 1.4 User’s Guide Resetting a Stack You might occasionally need to reset the stack. For example, you might need to reset a stack to fix an error condition, to download software through a modem, or to reset all statistics counters to 0 (zero). You can reset a stack three ways: ❑ Pressing the Reset button on the front panel of the switches. ❑ Using Omega’s Reset and restart option.
2. From the Main Menu, select Administration. The Administration menu in Figure 16 is displayed. Figure 16 Administration menu Note If you are running a local management session, the Administrator menu will contain two additional selections: XModem software update to this system and Connect to a remote system. 3. Select Reset and restart the system. The master switch will reset itself and the slave switches in the stack. Each switch runs a series of self-tests, which take a few seconds to complete.
AT-S25 Version 1.4 User’s Guide Reactivating the Default Settings on a Stack This procedure explains how to reset the stack settings to the factory default settings, which are listed in Appendix A on page 139. This procedure can only be performed locally through the RS232 port on the master switch. Warning This procedure should be performed with caution. Resetting a stack to its default setting deletes all existing settings, including the stack’s IP address and port settings.
5. Immediately press any key when you see the following prompt: Hit any key to run diagnostics or to reload system software. A menu is displayed. 6. Select D from the menu. The following warning message displays: WARNING: This will erase all current configuration data! Continue? Y/N 7. Type Y for yes. The system displays the following prompt: All configuration data has been reset to factory default values. 8. Type B to boot the stack software.
AT-S25 Version 1.4 User’s Guide Configuring the RS232 Port on the Master Switch The default settings for the RS232 port on the front panel of the Ethernet switch are as follows: ❑ Baud rate: 9600 ❑ Data bits: 8 ❑ Stop bits: 1 ❑ Parity: None ❑ Flow control: None To change the settings for the RS232 port on the master switch, perform the following procedure: 1. From the Main Menu, select the master switch. Note You must select the master switch to perform this procedure. Do not select a slave switch. 2.
The Terminal Configuration window shown in Figure 17 is displayed. Figure 17 Terminal Configuration Window If you are running the Omega session from a web browser, you can display the Terminal Configuration window by clicking on the RS232 port in the graphic display of the master switch. 4. Adjust the settings as desired. The parameters are described below. VT100-compatible / ANSI Generic “dumb” terminal You use these selections to specify the type of terminal. The default is VT100-compatible / ANSI.
AT-S25 Version 1.4 User’s Guide 1 stop bit 2 stop bits These two selections are used to specify the number of stop bits. The default is 1 stop bit. No parity Odd parity Even parity These selections are used to specify the parity type. The default is no parity. Full-duplex (echo) Half-duplex (no echo) These two selections control the duplex mode of the RS232 port. In full duplex, the management module echoes the characters received from the terminal back to the terminal.
Running Diagnostics The Omega interface has an option for running diagnostic self-tests on the switches in a stack. The program reports on the operating status of the following switch components: ❑ Flash PROM ❑ RAM ❑ Serial Interface ❑ Power supply ❑ Operating temperature The tests also display the following information: ❑ AT-S25 version number ❑ Stack MAC address ❑ Running time Note Running the diagnostic tests will not disrupt the network operations of a switch.
AT-S25 Version 1.4 User’s Guide The tests take only a second or two to complete. The results are displayed in the Diagnostics window. An example of the window is shown in Figure 18. Figure 18 Sample Diagnostics Window The Flash PROM, RAM, and Serial Interface test results are given as Good or Failed.
Displaying the Activity Monitor The Activity Monitor is useful in monitoring the status of a ping command or in determining the status of a software download from switch to switch. To display the Activity Monitor, perform the following procedure: 1. From the Main Menu, select the master switch. 2. From the Main Menu, select Administration. 3. From the Administration menu, select Activity monitor. The Activity Monitor window for the stack is displayed.
AT-S25 Version 1.4 User’s Guide Pinging a Device The ping command allows you to test if an end system can be reached by sending it an Internet Control Message Protocol (ICMP) echo request. If the system is connected to the network and operating, it sends a reply to the requesting system. To ping another device, perform the following procedure: 1. From the Main Menu, select any switch in the stack. 2. From the Main Menu, select Administration. 3. From the Administration menu, select Ping a remote system.
The activity monitor reports the results of the ping command. Figure 21 is an example. Figure 21 Ping Results Example Performing a ping command from a web-based Omega session stops after a set number of ping attempts. Performing a ping command from a local or remote Omega session continues until you stop it. 5. Return to the Main Menu.
Chapter 3 Configuring the Ports The procedures in this chapter allow you to view and change the parameter settings for the individual ports on a switch. Examples of port parameters include duplex mode and, in the case of the AT-8324 switch, port speed. This chapter also describes port trunking and port mirroring.
Displaying Port Status The Port Status window displays the current operating status of all the ports on a switch in a stack, including any expansion modules, if installed. The window enables you to quickly ascertain the operating status of the ports by displaying a variety of information, such as whether a link exists between the ports and the end nodes, and whether any of the ports have been manually disabled. To display the status of the ports on a switch, perform the following procedure: 1.
AT-S25 Version 1.4 User’s Guide The Port Status window contains the following information: Port This column displays the number and name of each port. You can assign names to the ports to make them easier to identify. For instructions on assigning port names, refer to Configuring Port Parameters on page 66. The standard twenty four ports on an AT-8324 switch are numbered 1 to 24, and the standard sixteen ports on an AT-8316F switch are numbered 1 to 16.
Configuring Port Parameters This section contains the procedure for configuring the parameters for the individual ports on a switch. To view and configure the parameter settings for a port on a switch, perform the following procedure: 1. From the Main Menu, select the switch in the stack with the port to be configured. 2. From the Main Menu, select Port Status and Configuration. The Port Status window in Figure 22 on page 64 is displayed. 3. Select the port to be configured.
AT-S25 Version 1.4 User’s Guide If you are running the Omega program from a web browser, you can display this window by clicking on a port in the graphical image of the managed switch. 4. Toggle the options as desired. Any changes to the port settings are activated immediately on the port. The options are described below. Receive Statistics Graph This option displays performance statistics for the port, specifically the number and types of frames and errors that have occurred on the port.
If the port is on an AT-8324 switch and you select the full-duplex or half-duplex setting rather than the default setting of autonegotiate, prompts are displayed for the port speed, as shown in Figure 24. The port speed on an AT-8324 switch can be 10 Mbps or 100 Mbps. (The 100 Mpbs port speed on an AT-8316F Series switch cannot be changed.) Figure 24 Port Speed Setting for an AT-8324 Switch Backpressure enabled (half-duplex) No backpressure Backpressure applies only to ports operating in half-duplex mode.
AT-S25 Version 1.4 User’s Guide Port name The port name field is used to assign a name to the port. Naming ports can make it easier for you to identify the various ports. A name can have up to 20 characters. An example is Sales - cube 223. Refresh The Refresh button at the bottom of the window queries the switch for the current port settings and displays the settings in the window. This button is available only from a web browser management session 5. Return to the Main Menu.
Configuring Port Trunks Port trunking is an economical way for you to increase the bandwidth between an AT-8300 Series switch and another network device, such as a server, router, workstation, or another switch. A port trunk is two or more data ports that have been grouped together to increase the bandwidth between a switch and a network node by functioning as one logical path.
AT-S25 Version 1.4 User’s Guide Guideline 3: Using Ports from the Same Group The ports on the AT-8300 Series switches are divided into groups. The ports for a port trunk must be members of the same group. The ports on an AT-8324 switch are divided into five groups, as illustrated in Figure 25.
The ports of a port trunk must be members of the same group. You cannot use ports from different groups. For example, you could use ports 4 and 5 on an AT-8324 switch as one port trunk, since the ports are members of the same group. However, ports 7, 8, 9, and 10 cannot be combined to form a port trunk on an AT-8324 switch because they belong to different groups. Guideline 4: Creating Only One Trunk Per Group Each group of ports on an Ethernet switch can support only one port trunk.
AT-S25 Version 1.4 User’s Guide Guideline 8: Creating Port Trunks on Expansion Modules The ports on some expansion modules can be grouped together to form port trunks. Refer to Table 4 to determine if your expansion modules support port trunking. Table 4 Trunked Ports on Expansion Modules Creating a Port Trunk Number of Ports on Expansion Module Port Trunks 1 Does not support port trunking. 2 One port trunk consisting of two ports. 4 One trunk consisting of two or four ports.
4. Select the port group in which to create the port trunk and enter the port numbers for the trunk. You can use either of the following formats to enter the port numbers: Single, consecutive ports (for example, 1,2) Range of ports (for example, 10-13) Figure 29 is an example. In the example, ports 10 through 13 in port group 2 have been designed as a port trunk. Figure 29 Example of Two Port Trunks 5. Press or select Enter. The port trunk is activated on the switch. 6.
AT-S25 Version 1.4 User’s Guide Deleting a Port Trunk To delete a port trunk from a switch, perform the following procedure: 1. From the Main Menu, select the switch with the port trunk to be deleted. 2. From the Main Menu, select System configuration. The System Configuration menu is displayed. 3. Select Port trunking. The Port Trunking window in Figure 28 on page 73 is displayed. 4. From a web-based Omega session, delete the ports from the appropriate port group in the window and select Enter.
Configuring a Port Mirror Port mirroring allows you to monitor the traffic on a port by having both the receive and transmit traffic on a port copied to another port on the switch. This enables you to monitor the traffic on the original port without interrupting network traffic by connecting a network analyzer or RMON port to the port which is functioning as the mirror port. The port whose traffic is to be monitored is referred to as the source port.
AT-S25 Version 1.4 User’s Guide 3. Select Enabled. The prompts in Figure 31 are displayed. Figure 31 Source and Destination Port Mirror Prompts 4. Select Source Module. A window is displayed listing the switches in the stack. 5. Select the switch containing the port to be monitored. 6. Select Source Port. A window is displayed listing the ports on the switch. 7. Select the port to be monitored. 8. Select Destination Module. A window is displayed listing the switches in the stack. 9.
Disabling Port Mirroring To disable port mirroring on a switch, perform the following procedure: 1. From the Main Menu, select the switch where port monitoring is to be disabled. 2. From the Main Menu, select Traffic/Port Mirroring. The Port Mirroring window in Figure 30 is displayed. 3. Select Disable. The port mirroring feature is now disabled on the switch. 4. Return to the Main Menu.
AT-S25 Version 1.4 User’s Guide Configuring Port Security The Fast Ethernet switch has a port security feature that can be used to enhance network security. This feature allows you to control network access by limiting the number of MAC addresses that are learned on the ports on a switch in a stack. Note The port security feature does not apply to ports on any expansion modules installed in the switch. To set the port security level for the ports on a switch, perform the following procedure: 1.
Secure This selection activates port security. With this option selected, the switch will continue to learn MAC addresses for each port up to a user-configurable maximum number. Once the maximum number has been reached on a port, any frames received on the port from a source with a new MAC addresses will be discarded. If you select this security feature, all static MAC addresses are deleted and must be reentered.
Chapter 4 Configuring the MAC Address Table This chapter describes the MAC address table and the static MAC address table. The chapter explains how to view the MAC addresses and how to add and delete entries from the static table.
MAC Address Table The MAC address table (also referred to as the forwarding table) is a snapshot of source MAC addresses that a switch has learned and stored in its volatile memory. When a frame is received by a port on a switch, the source address of the frame is inspected to determine whether or not the address is already in the table. If it is not, the switch adds the address to the table.
AT-S25 Version 1.4 User’s Guide Displaying the MAC Address Table To display the MAC address table for a switch, perform the following procedure: 1. From the Main Menu, select the master or slave switch whose MAC addresses you want to view. 2. From the Main Menu, select MAC Address Table. The MAC Address menu in Figure 35 is displayed. Figure 35 MAC Address Menu 3. Select Show all MAC addresses. The MAC Addresses window is displayed. An example is shown in Figure 36.
The table lists each MAC address that the stack has learned, the number or name of the port on which the MAC address was detected, and the VLAN to which the port belongs. Clicking the Refresh button at the bottom of the window queries the switch for the latest MAC addresses and displays an updated version of the MAC address table on the screen. 4. Return to the Main Menu.
AT-S25 Version 1.4 User’s Guide 5. Return to the Main Menu. Displaying the Port Number of a MAC Address The Omega interface allows you to determine the port on which a MAC address is located by specifying the address. This feature is useful in determining the port that a particular device is connected to on a switch. To display the port number for a specific MAC address, perform the following procedure: 1. From the Main Menu, select the switch where you believe the device is connected. 2.
Changing the Aging Time of the MAC Address Table If a switch in a stack detects a packet with a new source MAC address, the switch stores the MAC address in its address table. This means the switch has learned about the device that sent packets to the switch. The MAC address table is updated as new MAC addresses are detected. If a MAC address listed in the address table does not appear on any port after a specified period of time, the switch deletes that address from the table.
AT-S25 Version 1.4 User’s Guide Static MAC Address Table The static MAC table contains a list of the MAC addresses that have been entered manually. You can use the table to specify MAC address for devices connected to ports that might not be learned via the dynamic learning process of the stack. Entering static MAC addresses ensures certain devices access to the switch’s ports, because aging time, power failures, or switch resets do not affect the static MAC table.
Adding Addresses to the Static MAC Address Table To add MAC addresses to the static MAC address table, perform the following procedure: 1. Compile a list of the MAC addresses of the devices to be added to the table. 2. From the Main Menu, select the switch in the stack with the port where you want to add static MAC addresses. 3. From the Main Menu, select MAC Address Table. The MAC Address Table menu shown in Figure 35 is displayed. 4. Select Per port static MAC addresses.
AT-S25 Version 1.4 User’s Guide The window in Figure 43 is displayed. You use this window to specify the MAC address of the device you want to allow access to the port, as well as the name of the VLAN to which the port belongs. Figure 43 Adding a Static MAC Address 7. In the VLAN Name field, specify the VLAN to which the port belongs. If you have not created any VLANs on the stack, you should enter Default VLAN. Press or select Enter. 8.
Deleting Addresses from the Static MAC Address Table To delete addresses from the static MAC address table for a port, perform the following procedure: 1. From the Main Menu, select the switch containing the port where the static MAC addresses are to be deleted. 2. From the Main Menu, select MAC Address Table. The MAC Address Table menu in Figure 35 is displayed. 3. Select Per port static MAC addresses. A list of the ports on the switch is displayed. 4.
AT-S25 Version 1.4 User’s Guide Clearing the Static MAC Address Table To clear all addresses from the static MAC address for a switch in a stack, perform the following procedure: 1. From the Main Menu, select the switch containing the static address table to the cleared. 2. From the Main Menu, select MAC Address Table. The MAC Address Table menu shown in Figure 35 is displayed. 3. Select Clear static MAC table. 4. Select Yes to confirm or No to cancel the procedure.
Multicast Addresses A multicast is a special form of broadcast where copies of a packet are delivered to a specific group of end stations. This differs from a broadcast, which is a transmission that sends copies of a packet to all end stations on the network. A multicast address is a destination address. You can configure 10 (ten) multicast addresses per switch in a stack. Configuring a multicast address enables you to restrict certain packets to only go to a group of ports.
AT-S25 Version 1.4 User’s Guide 4. Select Add MAC address. The Adding a Multicast Address window shown in Figure 46 is displayed. Figure 46 Adding a Multicast Address Window 5. In the VLAN Name field, enter the name of the VLAN to receive the multicast frames. Press . 6. In the MAC Address field, enter the MAC address of the multicast stream. Press . 7.
Omega confirms a successful operation with the message MAC address added and the MAC address. 8. Return to the Main Menu. Changing a Multicast Port Assignment Deleting a Multicast Address To add or remove ports from a multicast MAC address assignment, reenter the multicast MAC address and the new port assignments by performing the instruction in the previous section. This will overwrite the old port assignments with the new port information.
AT-S25 Version 1.4 User’s Guide 5. In the VLAN Name field, enter the name of the VLAN from which the multicast address is to be deleted. 6. In the MAC Address field, enter the MAC address to be deleted. Press or select Enter. The multicast address is now deleted. 7. Return to the Main Menu.
Chapter 5 Configuring Virtual LANs and Quality of Service This chapter contains the procedures for creating and modifying VLANs. It also explains the Quality of Service (QoS) feature.
Creating a New VLAN This section contains the procedure for creating a new VLAN in a stack. The procedure explains how to assign a name to the VLAN and how to specify which ports will be members of the new VLAN. Note For background information on VLANs, refer to Appendix A, Introduction to Virtual LANs on page 139. To create a new VLAN, perform the following procedure: 1. From the Main Menu, select a switch in the stack with ports that will be members of the new VLAN.
AT-S25 Version 1.4 User’s Guide 3. Select Virtual LAN definitions. The program displays the VLANs window. This window lists the VLANs currently existing on the stack. The window provides the name of each VLAN along with the ports on the currently selected switch that are members of the VLAN. Figure 49 is an example of the window. Figure 49 VLANs Window The example shows that there are five VLANs on the stack: Default VLAN, Sales, Production, Engineering, and Technical Support.
Figure 50 VLAN Configuration Window 5. Select the VLAN Name field and enter a name for the new VLAN (for example, Marketing). Press . After entering the name for the new VLAN, the VLAN ID number automatically increments to the next available number. For example, if this is the first VLAN that you are adding to the stack, the VID number increments to 2. 6. If desired, select the ID field and change the VLAN ID number. Press .
AT-S25 Version 1.4 User’s Guide As shown below, you can specify the ports individually or in a range or both. By entering the word “All” in this field, all ports on the switch will be included in the new VLAN. Range of Ports Single Port 1, 4, 6-10 Ports on expansion modules, if installed, are included by default in the Ports on VLAN field. If desired, these ports can be removed from the field so that they will not be a part of the VLAN. 8.
8. Select Update this VLAN. The VLAN titled Sales has now been created in the stack. The new VLAN consists of ports 1 through 7 on the master switch. 9. Return to the Main Menu. 10. From the Main Menu, select the slave switch (stack ID 2). 11. From the Main Menu, select Virtual LAN/QoS. 12. From the Virtual LAN/QoS window, select the Sales VLAN. The VLAN Configuration window for the Sales VLAN is displayed. 13. In the All Ports on VLAN field, enter the following. Press .
AT-S25 Version 1.4 User’s Guide Example of Creating a Tagged VLAN This procedure creates the Production VLAN on the AT-8300 stack illustrated in Figure 62 on page 150. This VLAN contains several tagged ports in addition to untagged ports. To create the Production VLAN, you would perform the following steps: 1. From the Main Menu, select the master switch (stack ID 1). 2. From the Main Menu, select Virtual LAN/QoS. 3. From the Virtual LAN/QoS menu, select Virtual LAN Definition. 4.
The VLAN Configuration window for the Production VLAN is displayed. 14. In the All Ports on VLAN field, enter the following and press : 10, 16, 22-24 These are the ports, both tagged and untagged, on the slave switch that are to be a part of the Production VLAN. Ports 22 through 24 will be untagged ports while ports 10 and 16 will be tagged. 15.
AT-S25 Version 1.4 User’s Guide Modifying a VLAN This procedure explains how to add or delete ports from an existing VLAN. You can also change a port from untagged to tagged, or vice versa. To modify a VLAN, perform the following procedure: 1. From the Main Menu, select the switch in the stack that contains a port to be added or removed from the VLAN. 2. From the Main Menu, select Virtual LANs/QoS. The Virtual LAN/QoS menu shown in Figure 48 is displayed.
Deleting a VLAN To delete a VLAN from a stack, perform the following procedure: 1. From the Main Menu, select any switch in the stack. It does not matter which switch in a stack you select when deleting a VLAN. 2. From the Main Menu, select Virtual LANs/QoS. The Virtual LAN/QoS menu in Figure 48 on page 98 is displayed. 3. Select Virtual LAN definitions. The VLANs window in Figure 49 on page 99 is displayed. 4. Select the name of the VLAN to be deleted. Note You cannot delete the Default VLAN.
AT-S25 Version 1.4 User’s Guide Activating or Deactivating the Basic VLAN Mode This section contains the procedure for activating or deactivating the Basic VLAN Mode. Note For information on the Basic VLAN Mode, refer to Basic VLAN Mode on page 152 in Appendix A, Introduction to Virtual LANs. To activate or deactivate the Basic VLAN Mode, perform the following procedure: 1. From the Main Menu, select any switch in the stack. 2. From the Main Menu, select System Configuration.
Configuring Quality of Service The AT-8324 and AT-8316F Series Switches support Quality of Service (QoS) as defined in the IEEE 802.1p standard. QoS 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 QoS, network traffic was handled in a best-effort manner, where packet forwarding was typically performed on a first-in, first-out basis.
AT-S25 Version 1.4 User’s Guide To adjust the settings for priority queueing, perform the following procedure: 1. From the Main Menu, select the switch containing the port whose priority settings are to be changed. 2. From the Main Menu, select Virtual LANs/QoS. Note If the Omega Main Menu does not include the Virtual LANs/QoS selection, the stack is operating in the Basic VLAN Mode. Altering the priority queue settings is not allowed when a stack is operating in the Basic VLAN Mode. 3.
Assigning the CPU Management Port to a VLAN This section contains the procedure for assigning the CPU management port of the master switch to a VLAN. Be default, the management port is assigned to the VLAN named Default VLAN. Note This procedure should be performed with caution. The CPU management port must be assigned to the same VLAN that contains the ports to which your remote management stations are connected.
AT-S25 Version 1.4 User’s Guide 4. In the Management Port VLAN field, specify the VID of the VLAN to which the management port is to be assigned. Press . Note The VLAN must already exist. You cannot assign the management port to a VLAN that does not exist. The value 1 is the VID for the Default VLAN. 5. Return to the Main Menu.
Chapter 6 Displaying Ethernet Statistics The Omega interface allows you to view a wide range of statistics that you can use in diagnosing a problem and isolating it to a specific port. Menu selections enable you to view both received or transmitted frame statistics at either the switch or the port level. You can also view RMON statistics at either the switch or port level.
Displaying Statistics for Received Frames To display statistics for received frames at either the switch or the port level, perform the following procedure: 1. From the Main Menu, select the switch whose statistics you want to view. 2. From the Main Menu, select Ethernet Statistics. The Receive Statistics Graph window for the switch is displayed. Figure 54 is an example of the window.
AT-S25 Version 1.4 User’s Guide Table 5 defines the different types of received frames. Table 5 Received Ethernet Frames Frame Type Description Received Good Frames Total number of frames received by the switch since the last reset. Filtered Frames Frames received by the switch but not forwarded because the destination is within the same LAN segment, therefore, the frame was already seen by all nodes on the segment.
3. To view received frame statistics for a particular port, do either of the following: a. Select Individual port overview and then a port. The frames statistics for the selected port are displayed. Figure 55 is an example of the window. Figure 55 Graph of a Port’s Received Frames b. Select a frame type from the Receive Frames window. The statistics for the selected frame type for all of the ports is displayed. A example is shown in Figure 56.
AT-S25 Version 1.4 User’s Guide You can also view an individual port’s receive statistics by selecting the Port status and configuration option form the Main Menu, and choosing a port number. 4. To clear the graph, select Zero all statistics counters on the entire system. 5. Return to the Main Menu.
Displaying Statistics for Transmitted Frames To display statistics for transmitted frames at both the switch and port level, perform the following procedure: 1. From the Main Menu, select the switch whose statistics you want to view. 2. From the Main Menu, select Ethernet Statistics. The Receive Statistics Graph in Figure 54 is displayed. 3. Select Transmit Statistics. The window in Figure 57 is displayed.
AT-S25 Version 1.4 User’s Guide Table 6 defines the statistics. Table 6 Transmit Frames Frame Type Description Total good transmits Total frames transmitted by the switch without errors since the last reset. Broadcasts Frames forwarded by the switch destined for ALL nodes on the network, excluding multicast frames. Multicasts Frames forwarded by the switch destined for multiple but specific addresses, excluding broadcast frames.
Displaying RMON Statistics for a Switch To display the RMON statistics for a switch, perform the following steps: 1. From the Main Menu, select the switch whose RMON statistics you want to view. 2. From the Main Menu, select Ethernet statistics. The Receive Statistics Graph in Figure 54 on page 114 is displayed. 3. Select RMON statistics. The RMON Statistics Graph window is displayed. An example of the window is shown in Figure 58. Figure 58 RMON Statistics Graph Window 4.
AT-S25 Version 1.4 User’s Guide Displaying RMON Statistics for a Port To display RMON statistics for a specific port, perform the following procedure: 1. From the Main Menu, select the switch with the port whose RMON statistics you want to view. 2. From the Main Menu, select Ethernet statistics. The Receive Statistics Graph shown in Figure 54 on page 114 is displayed. 3. Select Port RMON Statistics. The Omega program displays a list of the ports on the switch. 4.
Resetting the Statistics Counters You reset statistics counters because: ❑ The counters no longer reflect the current information. For example, disabling a port to fix a problem does not reset its counters. After the error clears and you manually re-enable the port, you may want its statistics to accumulate from a fresh start. Otherwise, the counters and graphs will reflect information associated with the error condition and the counters will continue to increment from the wrong baseline.
AT-S25 Version 1.4 User’s Guide Interpreting the Graphs The statistics graphs show the types of received and transmitted frames since the last time the counters or the switch were reset. The counters and the graph dynamically increment as the switch processes frames over a period of time. When the individual counters reach a maximum of 232 (over 4 billion), they reset to zero.
Chapter 7 Configuring the Omega Interface This chapter describes the security features of the Omega interface. These features allow you to configure the interface so as to prevent unauthorized individuals from accessing it and making changes to the configuration settings of a switch or stack.
Creating an Omega Password To prevent unauthorized individuals from accessing the Omega interface and altering a stack’s configuration settings, you can assign a password to the program. Any person who starts the program will be required to enter the password, regardless of how they access the program (i.e., RS232 port, web browser, Telnet program, or SNMP management program). The default value for the Omega interface is no password. Each stack in your network can have its own Omega password.
AT-S25 Version 1.2 User’s Guide The Omega Options window in Figure 60 is displayed. Figure 60 Omega Options Window 3. Enter a new password for the Omega interface in the Password field at the top of the window and press . The password can be up to 20 characters. The password is displayed as a series of asterisks. To delete the current password but not assign a new password, enter a space in the Password field.
Specifying a Timeout Value Specifying a timeout value is a way to prevent unauthorized individuals from using the Omega interface in the event you forget to exit the Omega interface and leave your management station unattended. By specifying a timeout value, the program will end the session if it detects that there has been no management activity after the timeout value has expired. The default for the timeout value is 5 minutes. To enter a new timeout value, perform the following procedure: 1.
AT-S25 Version 1.2 User’s Guide Enabling and Disabling the Access Methods As explained in Chapter 1, you can access the Omega interface three different ways. You can disable one or more of the methods to enhance the security of a stack by preventing unauthorized individuals from accessing the stack and making changes to the configuration settings of the switches. To enable or disable an Omega access method, perform the following steps: 1. From the Omega Main Menu, choose System Configuration.
Chapter 8 Upgrading Switch Software and Configuration Files This chapter contains the following procedures: ❑ Upgrading the Stack Software on page 132 ❑ Using Omega to Upgrade Additional Stacks on page 135 ❑ Uploading and Downloading System Configuration Files on page 137 131
Upgrading the Stack Software Allied Telesyn periodically updates and revises the AT-S25 software for your AT-8300 Series switches. The latest version of the software is posted on the Allied Telesyn web site for you to download onto your switches and stacks. The file for you to download is a self-extracting compressed file. It contains several additional files. One the files is the actual software image file. It has an .IMG extension.
AT-S25 Version 1.2 User’s Guide Using XModem to Upgrade the Stack Software Omega supports software upgrades to the switch using XModem. It is assumed that you have the required setup to support this type of file transfer. You can upgrade the software in a stack by performing either of the following procedures: Method 1: Using the Omega Menus 1. Start a local Omega management session. Note This procedure cannot be performed from a Telnet or web browser management session.) 2.
3. Immediately press any key when you see the following prompt: Hit any key to run diagnostics or to reload system software. 4. Select XModem software update to this system. 5. Initiate the upgrade from your XModem host. The Xmodem host displays a message stating that the upgrade in progress. Be sure to wait until the switch has fully downloaded the software, performed its diagnostic tests, and reinitialized and rebooted itself before you attempt to reestablish an Omega session.
AT-S25 Version 1.2 User’s Guide Using Omega to Upgrade Additional Stacks Once you have upgrade the software on one stack in the network, you can use the Omega interface to download the new software onto the other stacks in your network. The stack uses TFTP of the TCP/IP protocol suite to download the software between stacks. These download features will still work even if you do not use TCP/IP on your network.
Repeat this procedure to download software to another stack on the network. Downloading Software to All Switches To download a new version of the switch software from one stack to all the other stacks using the Omega program, perform the following procedure: 1. Start an Omega session with the stack that contains the new stack software. The session can be a local session, web-based session, or a remote session. Note This procedure should be performed during periods of low network activity.
AT-S25 Version 1.2 User’s Guide Uploading and Downloading System Configuration Files The switch configuration information can also be downloaded and saved to a file on a workstation. This file can then be used to restore the configuration information to the same switch or can be uploaded to other switches of the same family that need to be configured identically. TFTP is used to download and upload the switch configuration information.
Appendix A Introduction to Virtual LANs A virtual LAN (VLAN) is a group of end nodes that function as if they are a part of the same LAN segment. A VLAN can consist of end nodes located in one specific area of a network or of end nodes that are widely dispersed. This flexibility allows you to form logical workgroups of end nodes located anywhere on your network. A VLAN constitutes a broadcast domain. A VLAN restricts the transmission of broadcasts only to the end nodes that are members of the same VLAN.
Introduction to Virtual LANs The AT-8324 and AT-8316F Series Switches support three types of VLANs: ❑ Port-based VLANs ❑ Tagged VLANs ❑ Basic VLAN Mode All three types of VLANs are described in the following sections.
AT-S25 Version 1.4 User’s Guide Port-based VLAN A port-based VLAN is a group of ports on an AT-8324 or AT-8316F Series switch that have been grouped together to form a logical Ethernet segment. A port-based VLAN can have as many or as few ports as needed. The VLAN can include ports from just one switch in an AT-8300 stack, or it can include ports from multiple switches in a stack. A portbased VLAN can even span different stacks or switches (including AT8224XL and AT-8216F Series switches).
Introduction to Virtual LANs You can assign this number manually or allow the AT-S25 software to do it automatically. The range of the VID varies depending on whether IGMP snooping is activated on an AT-8300 Series stack. If IGMP snooping is not activated, the VID range is from 2 to 4096. If IGMP snooping is activated, the range is 2 to 2047. You should take this into account when planning your VLANs and assigning VID values.
AT-S25 Version 1.4 User’s Guide General Rules to Creating a Portbased VLAN Below is a summary of the rules to observe when creating a port-based VLAN. ❑ Each port-based VLAN must be assigned a unique VID. If a particular VLAN spans multiples switches or stacks, each part of the VLAN on the different switches or stacks must be assigned the same VID. ❑ An port can be an untagged member of only one port-based VLAN at a time. ❑ When creating a VLAN in an AT-8300 stack, you create the VLAN only once.
Introduction to Virtual LANs Port-based VLAN Example Figure 61 is an example of two port-based VLANs that span an AT-8300 Series stack and one AT-8224XL Switch.
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Introduction to Virtual LANs 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 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.
AT-S25 Version 1.4 User’s Guide Tagged VLAN The second type of VLAN is referred to as a tagged VLAN. With a tagged VLAN, VLAN membership is determined by information within the frames that are received on a port. This contrasts to a port-based VLAN, where the PVIDs assigned to the ports determine VLAN membership. The VLAN information within the frames is referred to as a tag or tagged header.
Introduction to Virtual LANs Parts of a Tagged VLAN The parts of a tagged VLAN are much the same as those for a port-based VLAN. They are: ❑ VLAN Name ❑ VLAN Identifier ❑ Port VLAN Identifier ❑ Tagged and Untagged Ports Each item is described in the following sections. Note For explanations of VLAN name and VLAN identifier, refer back to VLAN Name and VLAN Identifier on page 141.
AT-S25 Version 1.4 User’s Guide General Rules to Creating a Tagged VLAN Below is a summary of the rules to observe when creating a tagged VLAN. ❑ Each tagged VLAN must be assigned a unique VID. If a particular VLAN spans multiple switches or stacks, each part of the VLAN on the different switches or stacks must be assigned the same VID. ❑ An untagged port can be an untagged member of only one VLAN at a time. ❑ A tagged port can be a member of multiple tagged VLANs.
Introduction to Virtual LANs Tagged VLAN Example Figure 62 is an example of a network that uses tagged ports in two tagged VLANs to share network devices.
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Introduction to Virtual LANs Basic VLAN Mode The third type of VLAN system support by the AT-8316F Series and AT8324 Switches is referred to as the Basic VLAN Mode. When the Basic VLAN Mode is activated, the switch or stack forwards frames based only on MAC addresses. All VLAN information, including PVIDs assigned to ports and VLAN tags in tagged frames, are ignored. Tagged frames are analyzed only for priority level. Packets are passed through the switch unchanged.
Appendix B AT-S25 Default Settings This appendix lists the AT-S25 Version 1.4 factory default settings. Settings Default IP Address Subnet Mask 0.0.0.0 0.0.0.
AT-S25 Default Settings Settings Omega Omega Password Omega Time Out Value Local Access Remote Access (Telnet or SNMP) Web-based Access AT-8324 Twisted Pair Ports Status Duplex Mode Speed Backpressure Flow Control Broadcast Packets Security AT-8316F Fiber Optic Ports Status Duplex Mode Speed Security VLANs Default VLAN Name VID RS232 Port Configuration Data Bits Stop Bits Parity Duplex Mode Data Rate 154 Default No password 5 minutes Enabled Enabled Enabled Enabled Auto-negotiation Auto-negotiation Disab
Appendix C Spanning Tree Protocol Concepts This appendix provides a brief explanation of the Spanning Tree Protocol (STP) as implemented by Allied Telesyn on the AT-8300 Series Fast Ethernet Switches. For detailed information on the operation of the Spanning Tree Protocol, consult Section 4 of IEEE Std 802.1D, ISO/IEC 10038: 1993. The AT-8300 switches, which run the AT-S25 software, implement the IEEE 802.1D Spanning Tree Protocol.
Spanning Tree Protocol Features The switches implement the following STP features: ❑ Compensate automatically for the failure, removal, or addition of any bridge in an active data path. ❑ Achieve port changes in short time intervals, which establishes a stable active topology quickly with a minimum of network disturbance. ❑ Use a minimum amount of communications bandwidth to accomplish the operation of the STP.
AT-S25 Version 1.2 User’s Guide Spanning Tree Protocol Parameters Several configuration parameters control the operation of the Spanning Tree Protocol. Table 7 describes the parameters and lists each parameter’s default settings for the switch.
Spanning Tree Protocol Operation When STP is enabled for the first time, or when the network topology changes due to a failure, the addition, or removal of a component, the spanning tree algorithm automatically sets up the active topology of the current network. Communication Between Bridges Periodically, all devices running STP on a network transmit packets to each other through the Bridge Group Address which all bridges share.
Appendix D Supported Platforms Table 8 lists the Allied Telesyn Fast Ethernet switches that are supported by the AT-S25 Version 1.2 software. Table 8 Switch Models Model1 Number of Ports Type of Ports Type of Connector Maximum Distance2 AT-8324 24 10/100Base-TX RJ-45 100 m (328 ft) AT-8316F/MT 16 100Base-FX MT-RJ 2 km (1.25 mi) AT-8316F/VF 16 100Base-FX VF-45 2 km (1.25 mi) AT-8316F/SC 16 100Base-FX SC 2 km (1.25 mi) 1. All models include two expansion slots. 2.
Supported Platforms Table 9 Optional Expansion Modules Model Number of Ports Type of Ports Type of Connector Maximum Distance1 AT-A18 4 10/100Base-TX RJ-45 100 m (328 ft) AT-A19 2 100Base-FX MT-RJ 2 km (1.25 mi) AT-A22/SX 1 1000Base-SX SC 550 m (1,804 ft) AT-A22/LX 1 1000Base-LX SC 10 km (6.2 mi) AT-A24/SX 1 1000Base-SX MT-RJ 550 m (1,804 ft) AT-A24/LX 1 1000Base-LX MT-RJ 10 km (6.2 mi) 1.
Index (Items in italic are menu selections.
Index STP parameters, 46 STP port parameters, 43 switch IP parameters, 38 Connect to remote system, 31 connecting to remote stack, 31 conventions, used in this guide, 10 cost, 46 CPU management port, 110 CRC errors, 115 creating a VLAN, 98 D data bits, 56 data rate, 57 DEC VT100 terminal, 21 Default Aging Time, 86 default domain name, 41 default settings reassigning stack default values, 53 Default VLAN, 97 Delete MAC Address, 94 deleting multicast addresses, 94 port trunk, 75 static MAC addresses, 90 VLAN
AT-S25 Version 1.4 User’s Guide L late collisions, 119 local Omega session enabling or disabling, 129 quitting, 23 starting, 19 long frame, 115 M MAC address table aging time, configuring, 86 defined, 82 displaying, 83 displaying by MAC address, 85 displaying by port, 84 MAC address, 58 main menu local session, 20 web browser session, 26 management port.
Index P parity, 57 partitioning a port, 67 password Config Download, 42, 137 download, 41 Omega interface, 126 Per port static MAC addresses, 88, 90 Ping a remote system, 61 ping command, 61 Port Configuration and Statistics, 64, 66 port cost, 157 port groups, 71 port mirroring defined, 76 enabling, 76 port mirroring, disabling, 78 port name, 69 port priority, 157 Port RMON statistics, 121 port security, 79 Port spanning tree configuration, 44 Port Status and Configuration, 32 port status, 64 port trunking
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