Management Software ® AT-S24 ◆ User’s Guide FOR USE WITH AT-8216FXL, AT-8224XL, AND AT-8288XL FAST ETHERNET SWITCH PRODUCTS VERSION 2.
Copyright 2000 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. CentreCom is a registered trademark of Allied Telesyn International, Corp. Netscape Navigator is a registered trademark of Netscape Communications Corporation.
Table of Contents Preface ...................................................................................................................................................................................................................... 9 Supported Platforms ............................................................................................................................................................................................. 9 Purpose of This Guide ..................................
Table of Contents Chapter 2 Managing a Switch ........................................................................................................................................................................................... 39 Configuring the Switch IP Parameters ......................................................................................................................................................... 40 Setting IP Parameters...........................................................
AT-S24 Version 2.01 User’s Guide Chapter 5 Configuring Virtual LANs and Quality of Service ............................................................................................................................ 101 Overview .............................................................................................................................................................................................................. 102 Port-Based VLANs.......................................................
Table of Contents Appendix A AT-S24 Default Settings ...............................................................................................................................................................................153 Appendix B Spanning Tree Protocol Concepts ..........................................................................................................................................................155 Spanning Tree Protocol Features ..............................................
List of Figures Chapter 1 Getting Started Figure 1: Omega Main Menu from a Local Session ............................................................................................................................. 24 Figure 2: Entering a Switch’s IP Address in the URL Field ................................................................................................................. 28 Figure 3: Initial Omega Window from a Web Browser ....................................................................
List of Figures Figure 31: Port Trunking Window for an AT-8224XL Switch ...........................................................................................................75 Figure 32: Example of a Port Trunk on an AT-8224XL Switch .........................................................................................................76 Figure 33: Port Mirroring Window ..................................................................................................................................
Preface This guide contains instructions on how to use the AT-S24 Version 2.01 management software and the Omega management interface to manage and configure your AT-8216FXL, AT-8224XL, and AT-8288XL Series Fast Ethernet Switches. Supported Platforms Version 2.01 of the AT-S24 management software is supported on the following Allied Telesyn Fast Ethernet switches: ❑ AT-8216FXL/MT ❑ AT-8216FXL/VF ❑ AT-8216FXL/SC ❑ AT-8224XL ❑ AT-8288XL/MT ❑ AT-8288XL/SC Version 2.
❑ AT-A18 10/100Base-TX Expansion Module ❑ AT-A19 100Base-FX Expansion Module ❑ AT-A22/SX 1000Base-SX Expansion Module ❑ AT-A22/LX 1000Base-LX Expansion Module Note Refer to Appendix C for additional information on the switches and expansion modules supported by this version of the AT-S24 management software.
AT-S24 Version 2.01 User’s Guide Purpose of This Guide This guide is intended for network administrators who are responsible for managing the switches. Network administrators should be familiar with Ethernet switches, Ethernet and Fast Ethernet technology, bridging, and the Spanning Tree Protocol (STP).
How This Guide is Organized This guide contains the following chapters and appendices: Chapter 1, Getting Started, explains how to start an Omega session. This chapter also describes the Omega Main Menu and how to navigate around the various menus. Chapter 2, Managing a Switch, describes how to configure the IP parameters for a switch, how to set the spanning tree protocol parameters, and more.
AT-S24 Version 2.01 User’s Guide Document Conventions This guide uses several conventions that you should become familiar with first before you begin to install the product. Note Notes provide additional information. Warning Warnings inform you that performing or omitting a specific action may result in bodily injury. Caution Cautions inform you that performing or omitting a specific action may result in equipment damage or loss of data.
Where to Find Web-based Guides The Allied Telesyn web site at www.alliedtelesyn.com offers you an easy way to access the most recent documentation and technical information for all of our products. There are several manuals that you will need in order to manage your Ethernet switch. The following manual contains the hardware installation instructions for the switch.
AT-S24 Version 2.01 User’s Guide Contacting Allied Telesyn You can contact Allied Telesyn technical support by telephone, fax or e-mail. You can also contact technical support online through our web site. Online Support Technical Support and Services Technical Support E-mail Addresses You can request technical support online by filling out the Online Technical Support Form at www.alliedtelesyn.com/forms/support.htm.
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.
AT-S24 Version 2.01 User’s Guide FTP Server If you need a device driver for an Allied Telesyn device and you know the name of the driver, 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.
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 18 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 different procedures for starting an Omega management session.
Getting Started Overview The Omega interface simplifies the task of managing your Allied Telesyn AT-8216FXL, AT-8224XL, and AT-8288XL Series Fast Ethernet switches. This menu-oriented interface, which comes pre-installed on the switch along with the AT-S24 software, enables you to configure and manage all of the switch parameters, such as the IP address, the gateway address, and the subnet mask of the switch.
AT-S24 Version 2.01 User’s Guide Starting a Local Omega Session Using the RS232 Port This section contains the procedure for starting a local Omega session by connecting a terminal to the RS232 port on the switch. Note If you are managing the switch in a TCP/IP environment and you are configuring the IP parameters for the first time, you must access the Omega program locally using this procedure and assign the switch an IP address and, if necessary, a gateway address and a subnet mask.
Getting Started Omega Main Menu Figure 1 illustrates the Omega Main Menu. Allied Telesyn AT-8224XL Ethernet Switch 2.0.
AT-S24 Version 2.01 User’s Guide Selecting Menu Options and Changing Parameters If you are using the DEC VT100 or ANSI (the default) terminal configuration, refer to Table 1 for instructions on how to select menu options. Table 1 DEC VT100 or ANSI Terminal When directed to You must Select an option Highlight the option by pressing the Up ( ↑ ) and Down ( ↓ ) arrow keys; then press or Type the first character of the desired option at the prompt and press .
Getting Started Table 2 shows you how to move through and select menu selections if you are using a generic (dumb) terminal configuration: Table 2 Generic (Dumb) Terminal When directed You must To select an option Type the first character of the desired option 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-S24 Version 2.01 User’s Guide Note If you are configuring the switch for the first time and the switch is in a TCP/IP network, go to Chapter 2, Managing a Switch for instructions on how to assign the switch an IP address, subnet mask, and gateway address. Quitting from a Local Session To quit a local Omega session, select Quit from the Main Menu. If you do not quit Omega from a local session, remote Telnet sessions to the switch will be blocked.
Getting Started Starting an Omega Session from a Web Browser This section contains the procedure for starting an Omega session from a web browser. Note You cannot use a web browser to manage a Fast Ethernet switch if the switch is part of a non-TCP/IP network. Before you can manage the switch in a TCP/IP environment, it must have an IP address.
AT-S24 Version 2.01 User’s Guide The window shown in Figure 3 is displayed.
Getting Started Managed Switch At the top of the window is an image of the switch that you are currently managing. (The display will not include any optional expansion modules that might be installed in the switch.) You can click on certain areas of the switch to activate windows. Clicking on a port displays the configuration window for that port, which you use to set the port parameters. Clicking on the RS232 port displays the configuration window for the terminal port.
AT-S24 Version 2.01 User’s Guide Options in which you can provide a value contain an entry field and the two buttons Enter and Reset, as shown in the following example: Figure 6 Entry Field After entering a new value, click Enter to send the new parameter setting to the switch. Changes to parameters are activated immediately on the switch. The Reset button queries the switch for the current parameter setting and displays the setting in the entry field.
Getting Started Starting a Remote Omega Session with Telnet or an SNMP Management Program A switch can be managed with the Telnet program or with an SNMP management program, such as HP Openview. This type of switch management is referred to as remote management. If the switch is in a TCP/IP environment, remote management is possible only after the switch has been assigned an IP address. This is accomplished by managing the switch locally through the RS232 port.
AT-S24 Version 2.01 User’s Guide Connecting to a Remote Switch If you are managing a switch locally (that is, through the RS232 port on the switch), you can connect to another switch through the Omega interface and so be able to manage the remote switch, without having to end your local session. To connect to a remote switch 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.
Getting Started Menu Tree Table 3 lists the Omega menu selections. Table 3 Omega Menu Selections Main Menu Selection Menu Selection Page Function 66, 68 Displays and configures the parameter settings for the ports on the switch. Transmit statistics 137 Displays statistics on the number of frames transmitted by a port or the switch. Individual port overview 134, 137 Displays the received and transmitted frame statistics for a specific port.
AT-S24 Version 2.01 User’s Guide Table 3 Omega Menu Selections (continued) Main Menu Selection Menu Selection Page Function Reset and restart the system 54 Resets the switch. System name 53 Assigns a name to a switch. Default aging time 90 Sets the aging time for the MAC address table. Omega options 144, 146, 147 Configures the Omega security features, such as the Omega password and the timeout value.
Getting Started Table 3 Omega Menu Selections (continued) Main Menu Selection Menu Selection Page Function Priority weight configuration 131 Configures the ratio by which high and normal priority tagged frames are handled by the switch. Assign management port to VLAN 128 Assigns the CPU Management Port to a VLAN. Change the VLAN mode 124 (802.1Q VLAN or multiple VLANs) Toggles the switch between port-based and tagged VLANs and the multiple VLAN configuration.
AT-S24 Version 2.01 User’s Guide Table 3 Omega Menu Selections (continued) Main Menu Selection Menu Selection Page Function Clear static MAC table 96 Clears all entries from the static MAC address table. The following figures show the menu selection arrangement.
Getting Started Traffic/Port Mirroring Enable/Disable port mirroring Virtual LANs/QoS Virtual LAN definitions Port to VLAN configuration Bridging MAC Address Table Spanning tree parameters Show all MAC addresses Port spanning tree configuration By port MAC addresses Enable spanning tree by port Assign port priority Enable spanning tree for all ports Priority weight configuration Assign management port to VLAN Change the VLAN mode Gateway MAC address for Multiple VLAN Disable spanning tree fo
Chapter 2 Managing a Switch This chapter contains the following procedures: ❑ Configuring the Switch IP Parameters on page 40 ❑ Configuring the Spanning Tree Protocol on page 45 ❑ Enabling or Disabling IGMP Snooping on page 51 ❑ Naming a Switch on page 53 ❑ Resetting a Switch on page 54 ❑ Reassigning the Default Settings for the Switch on page 55 ❑ Configuring the RS232 Port on page 56 ❑ Running Diagnostics on page 59 ❑ Displaying the Activity Monitor on page 61 ❑ Pinging a Device on page 62 39
Managing a Switch Configuring the Switch IP Parameters In a TCP/IP network, the Ethernet switch requires a set of IP parameters, such as a unique IP address and subnet mask. The switch obtains its IP parameters in one of the following ways: ❑ You assign the IP parameters with Omega using the procedure described in this section. ❑ The switch obtains its IP parameters from a BootP or DHCP server. If you have BootP or DHCP, the switch can obtain its IP parameters from the BootP or DHCP server during startups.
AT-S24 Version 2.01 User’s Guide Setting IP Parameters To set the IP parameters for the switch, perform the following procedure: 1. From the Omega Main Menu, select System Configuration. The System Configuration menu shown in Figure 8 is displayed. Figure 8 System Configuration Menu 2. Select IP Parameters.
Managing a Switch The IP Parameters window shown in Figure 9 is displayed.
AT-S24 Version 2.01 User’s Guide 3. Enter or change the parameters in the window as desired. Note If you are configuring the switch for the first time and the switch is connected to a TCP/IP network, you must provide values for the IP address and subnet mask. These are the minimum parameters that you must specify for a newly installed Ethernet switch in a TCP/IP network. Unless stated otherwise, a change to an IP parameter is activated immediately on the switch.
Managing a Switch If you select Enable DHCP function, the switch will obtain its IP address from a DHCP server on the network. If you select Disable DHCP function, you must assign the IP address manually. The default for this setting is disabled. A change to the DHCP setting does not take affect on the switch until the unit is reset. Download password This password is used as the destination filename when you are using TFTP to update the AT-S24 firmware.
AT-S24 Version 2.01 User’s Guide Configuring the Spanning Tree Protocol The Spanning Tree Protocol (STP) prevents data loops when end stations in extended networks send and receive packets through multiple or redundant paths. Each switch is a learning bridge with the following functions: ❑ Learns source MAC addresses of incoming packets by storing the information in a forwarding table (see also Chapter 4, Configuring the MAC Address Table).
Managing a Switch Caution STP on a switch is disabled by default. If you enable STP, the switch provides default STP parameters that are adequate for most networks. Changing them without prior experience and an understanding of how STP works might have a negative effect on your network. Activating or Deactivating STP and Configuring the Port Parameters The Omega program allows you to activate and deactivate STP on a per port basis. You can also adjust the STP parameters for each port.
AT-S24 Version 2.01 User’s Guide The Port Parameters for the Spanning Tree Protocol window shown in Figure 12 is displayed. The window lists the ports on the switch and the current STP parameter settings for the ports. Figure 12 Port Parameters for the Spanning Tree Protocol 3. 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 at the bottom of the window.
Managing a Switch The STP Port Parameters window in Figure 13 is displayed. Figure 13 Port STP Parameters Window If STP is already activated on the port, the port’s STP parameters are also displayed, as shown in Figure 14. Figure 14 Setting Port STP Parameters Window 5. To enable STP on the port, select Enable Spanning Tree. To disable STP on the port, select Disable Spanning Tree. If you enable the port, the STP parameters for the port are displayed. 6.
AT-S24 Version 2.01 User’s Guide Configuring STP Parameters To configure the STP parameters for the switch, perform the following procedure: 1. From the Omega Main Menu, select Bridging. The Bridging menu shown in Figure 11 on page 46 is displayed. 2. Select Spanning tree parameters. The Spanning Tree Parameters window in Figure 15 is displayed. Figure 15 Spanning Tree Parameters Window 3. Adjust the settings as desired. The options are described below.
Managing a Switch Max Age Time The aging time can be from 6 to 40 seconds. The default is 20 seconds. All bridges in a bridged LAN use this aging time to test the age of stored configuration messages called bridge protocol data units (BPDUs). For example, if you use the default 20, all bridges delete current configuration messages after 20 seconds. Note The aging time for BPDUs is different from the aging time used by the MAC address table.
AT-S24 Version 2.01 User’s Guide Enabling or Disabling IGMP Snooping The Ethernet switch supports the Internet Group Management Protocol (IGMP) snooping feature to take advantage of performance improvements provided by IP multicasting. Allied Telesyn AT-S24 implementation supports IGMP Version 1. Through the IGMP snooping feature, the switch obtains information about multicast groups by looking at IGMP packets sent from hosts and routers, and also by looking at DVMRP multicast routing protocol packets.
Managing a Switch 4. Select IGMP snooping to activate the option or No IGMP snooping to deactivate IGMP snooping on the switch. A change to the status of the IGMP snooping feature is activated immediately on the switch. 5. If desired, you can change the IGMP snooping aging time by selecting the IGMP Snooping Aging Time parameter. This value, which is specified in minutes, determines the permitted intervals between report messages from the multicast clients. 6. Return to the Main Menu.
AT-S24 Version 2.01 User’s Guide Naming a Switch This procedure assigns a name to the switch. The name is displayed in all Omega windows when you manage the switch. This can make it easier for you to identify the switches in your network when you configure and monitor them with Omega. To assign a name to a switch, perform the following procedure: 1. From the Omega Main Menu, select System Configuration. The System Configuration menu shown in Figure 8 on page 41 is displayed. 2. Select System name.
Managing a Switch Resetting a Switch This procedure explains how to reset a switch using the Omega interface. You might need to reset the switch to resolve an error condition or after you have made a configuration change to the switch that requires resetting the device to activate the change. You can also reset a switch by pressing the Reset button, located on the front panel of the switch, with a small pointed object, such as a ballpoint pen.
AT-S24 Version 2.01 User’s Guide Reassigning the Default Settings for the Switch This procedure resets the switch settings to the factory default settings, listed in Appendix A. This procedure can only be performed through the RS232 port of the switch. You cannot perform this procedure through a web browser or Telnet Omega session. Warning This procedure should be performed with caution.
Managing a Switch Configuring the RS232 Port The default settings for the RS232 port on the front panel of the Ethernet switch are as follows: ❑ Baud rate: 9600 ❑ Data bits: 8 ❑ Parity: None ❑ Stop bits: 1 ❑ Flow control: None To change the settings for the RS232 port, perform the following procedure: 1. From the Omega Main Menu, select System Configuration. The System Configuration menu in Figure 8 on page 41 is displayed. 2. From the System Configuration menu, select Terminal Configuration.
AT-S24 Version 2.01 User’s Guide 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 graphical display of the switch. 3. Adjust the settings as desired. The parameters are described below. VT100-compatible / ANSI Generic “dumb” terminal These two selections are used to specify the type of terminal or terminal emulator to be used with the RS232 port. 8 data bits 7 data bits The default is 8 data bits.
Managing a Switch ❑ 150 bps ❑ 75 bps ❑ Automatic baud rate detection. The default is Automatic baud rate detection. 4. After making the necessary changes, return to the Main Menu.
AT-S24 Version 2.01 User’s Guide Running Diagnostics The Omega interface has an option for running diagnostic self-tests on the switch.
Managing a Switch The tests take only a second or two to complete. The results are displayed in the Diagnostics window. Figure 21 is an example of the window. Figure 21 Sample Diagnostics Window The Flash PROM, RAM, and Serial Interface test results are given as Good or Failed. 3. Return to the Main Menu.
AT-S24 Version 2.01 User’s Guide Displaying the Activity Monitor The Activity Monitor is useful in troubleshooting or in monitoring switch activity. To display the Activity Monitor, perform the following procedure: 1. From the Omega Main Menu, select Administration. 2. From the Administration menu, select Activity monitor. The Activity Monitor for the switch displays. The example shown in Figure 22 shows the results of a ping command. Figure 22 Activity Monitor Window 3. Return to the Main Menu.
Managing a Switch 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 Omega Main Menu, select Administration. 2. From the Administration menu, select Ping a remote system. The Ping window in Figure 23 is displayed.
AT-S24 Version 2.01 User’s Guide 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. 4. Return to the Main Menu.
Chapter 3 Configuring the Ports The procedures in this chapter allow you to view and change the port parameter settings, such as the duplex mode and, for some switch models, port speed. This chapter also describes port trunking and port mirroring, as well as port security.
Configuring the Ports Displaying Port Status The Port Status window displays the current operating status of all the ports on the switch, including the ports on any expansion modules, if installed. The window allows 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.
AT-S24 Version 2.01 User’s Guide Link This column indicates whether there is an active connection between a port and the device connected to the port. Offline indicates that there is no link, while Online indicates that there is a link. If a port is online, this column will also specify the operating speed of the port. Status This column indicates whether a port is enabled or disabled. For instructions on how to manually disable or enable a port, refer to the section Configuring Port Parameters on page 68.
Configuring the Ports Configuring Port Parameters This section contains the procedure for configuring the parameters for the individual ports on a switch. Port parameters that you can change include duplex mode, flow control, back pressure, and, for some switch models, port speed. To view and configure the parameter settings for the ports, perform the following procedure: 1. From the Omega Main Menu, select Port Status and Configuration. The Port Status window in Figure 25 on page 66 is displayed. 2.
AT-S24 Version 2.01 User’s Guide If you are running the Omega interface from a web browser, you can display this window by clicking any port in the graphical display of the managed switch. 3. Configure the port settings as desired. A change to a port setting is activated immediately on the port. The parameters 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.
Configuring the Ports performance settings. If a connected device is not compliant, it should only be configured for half-duplex. Auto-negotiate is the default for all ports. If you select the half-duplex or full-duplex setting on an AT-8224XL switch or one of the twisted pair ports on an AT-8288XL switch, the prompts in Figure 27 are displayed. You can use these prompts to select the port speed.
AT-S24 Version 2.01 User’s Guide Discard broadcast packets Regular forwarding of broadcasts With this option, you can decide whether the switch forwards broadcast packets or not. 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. 4. Return to the Main Menu.
Configuring the Ports Configuring Port Trunks Port trunking is an economical way for you to increase the bandwidth between the 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 the switch and a network node by functioning as one logical path.
AT-S24 Version 2.01 User’s Guide The ports on the AT-8224XL Switch are divided into five groups, as illustrated in Figure 29.
Configuring the Ports Guideline 5: Maintaining Cabling Sequence Based on Port Number When cabling a trunk, it is important that the order of the connections be identical on both nodes. The lowest numbered port in a trunk on one device must be connected to the lowest numbered port of the trunk on the other device, the next lowest numbered port must be connected to the next lowest numbered port on the other device, and so on.
AT-S24 Version 2.01 User’s Guide Creating a Port Trunk This section contains the procedure for creating a port trunk. Caution Do not connect the cables to the port trunk on the switch until after you have created the port trunk. Connecting the cables prior to creating the trunk will result in data loops in your network topology. To create a port trunk, perform the following procedure: 1. From the Omega Main Menu, select System configuration. The System Configuration menu is displayed. 2.
Configuring the Ports 4. Select the port group in which to create the port trunk and enter the port numbers for the trunk. Select Enter or press . 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) In the example in Figure 32, ports 10 through 13 in port group 2 have been designed as a port trunk.
AT-S24 Version 2.01 User’s Guide Deleting a Port Trunk To delete a port trunk, perform the following procedure. 1. Disconnect the cables from the port trunk on the switch. Caution Disconnect the cables from the port trunk on the switch before you delete the port trunk. Deleting the trunk before you have disconnected the cables will create data loops in your network. 2. From the Omega Main Menu, select System configuration. The System Configuration menu is displayed. 3. Select System switch configuration.
Configuring the Ports Configuring Port Mirroring 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. By connecting a network analyzer or RMON port to the other port, you can monitor the traffic on the original port without interrupting network traffic. The port to be monitored is referred to as the source port. The port that will function as the mirror port is referred to as the destination port.
AT-S24 Version 2.01 User’s Guide 2. Select Enabled. The prompts in Figure 34 are displayed. Figure 34 Source and Destination Port Mirror Prompts 3. Select Source Port. A window is displayed listing the ports on the switch. 4. Select the port to be monitored. 5. If you are running a web-based Omega session, return to the window containing the prompts in Figure 34. 6. Select Destination Port. Again, a window is displayed listing the ports on the switch. 7.
Configuring the Ports Disabling Port Mirroring To disable port mirroring on the switch, perform the following procedure: 1. From the Omega Main Menu, select Traffic/Port Mirroring. The Port Mirroring window in Figure 33 is displayed. 2. Select Disabled. The port mirroring feature is now disabled on the switch. 3. Return to the Main Menu.
AT-S24 Version 2.01 User’s Guide Configuring Port Security The Fast Ethernet switch features two levels of port security that you can use to enhance network security. These levels allow you to control network access by limiting the number of MAC addresses that are learned on the ports on the switch. The levels are as follows: Limited - The ports will continue to learn new MAC addresses up to a user defined maximum limit.
Configuring the Ports 3. Select the desired port security level. The levels are described below: Automatic This selection disables port security. With this option activated, the switch will not restrict the number of MAC addresses that are learned on the switch ports. This is the default setting. Limited This selection activates a limited version of port security. With this level selected, the switch will continue to learn MAC addresses for each port up to a user defined maximum number.
AT-S24 Version 2.01 User’s Guide Secure This option causes the switch to immediately stop learning new MAC addresses on all or selected ports. Any frames received on a port from a source with a new MAC address will be discarded. Existing static MAC addresses are retained and are used in determining which addresses are accepted by a port. However, you cannot add new static addresses to ports with this level of security.
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 modify the static table. This chapter also contains instructions on how to configure multicast addresses for the ports of the switch.
Configuring the MAC Address Table MAC Address Table The MAC address table (also referred to as the forwarding table) is a snapshot of the 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 the address is already in the table. If it is not, the switch adds the address to the table. Each Fast Ethernet switch maintains its own MAC address table.
AT-S24 Version 2.01 User’s Guide Displaying the MAC Address Table To display a switch’s MAC address table, perform the following procedure: 1. From the Omega Main Menu, select MAC Address Table. The MAC Address menu in Figure 38 is displayed. Figure 38 MAC Address Menu 2. Select Show all MAC addresses. The MAC Addresses window is displayed. An example is shown in Figure 39.
Configuring the MAC Address Table The table lists each MAC address that the switch has learned, the number or name of the port on which the MAC address was detected, and the VLAN to which the port belongs. The Refresh button queries the switch for the latest MAC address information and updates the window. 3. Return to the Main Menu. Displaying the MAC Addresses of a Port The procedure in this section explains how to display the MAC addresses of a specific port.
AT-S24 Version 2.01 User’s Guide 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 the switch. To display the port number for a specific MAC address, perform the following procedure: 1. From the Omega Main Menu, select MAC Address Table. 2. Select Get Port From MAC Address.
Configuring the MAC Address Table Clearing All Dynamic MAC Addresses To clear all of the learned MAC addresses from the MAC address table, perform the following procedure: 1. From the Omega Main Menu, select MAC Address Table. 2. Select Clear dynamic MAC table. Confirmation prompts are displayed. 3. Select Yes to clear the table or No to cancel the procedure. If you select Yes, all MAC addresses are deleted from the switch’s dynamic MAC address table. 4. Return to the Main Menu.
AT-S24 Version 2.01 User’s Guide 3. Select the Default Aging Time entry field and enter a new value (in seconds). The default is 300 seconds. The maximum is 999 seconds. Note Entering a value of 0 (zero) deactivates the MAC aging time parameter. MAC addresses continue to be added to the table until the table is full. Once the table is full, any frame with a new MAC address will be flooded to all appropriate ports. 4. Return to the Main Menu.
Configuring the MAC Address Table 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 the MAC addresses of devices that are connected to ports that might not be learned through the dynamic learning process of the switch. Entering static MAC addresses ensures that certain devices have access to the switch ports, because aging time, power failures, or switch resets do not affect the static MAC table.
AT-S24 Version 2.01 User’s Guide 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. Note You can assign only one static MAC address per port on the switch. 2. From the Omega Main Menu, select MAC Address Table. The MAC Address Table menu shown in Figure 38 on page 87 is displayed. 3. Select Per port static MAC addresses.
Configuring the MAC Address Table The window in Figure 46 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 46 Adding a Static MAC Address Window 6. Select the VLAN Name field and enter the name of the VLAN to which the port belongs. The default is Default VLAN. Select Enter or press . 7.
AT-S24 Version 2.01 User’s Guide Deleting Addresses from the Static MAC Address Table To delete an address from the static MAC address table, perform the following procedure: 1. From the Omega Main Menu, select MAC Address Table. The MAC Address Table menu in Figure 38 is displayed. 2. Select Per port static MAC addresses. A list of the ports on the switch is displayed. 3. Select the port containing the static MAC address to be deleted. The window in Figure 45 on page 93 is displayed. 4.
Configuring the MAC Address Table Clearing the Static MAC Address Table To clear all addresses from the static MAC address table for a switch, perform the following procedure: 1. From the Omega Main Menu, select MAC Address Table. The MAC Address Table menu shown in Figure 38 on page 87 is displayed. 2. Select Clear static MAC table. A confirmation screen is displayed. 3. Select Yes to delete the static MAC address or No to cancel the procedure.
AT-S24 Version 2.01 User’s Guide 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. Configuring a multicast address allows you to restrict certain packets to a specific group of ports.
Configuring the MAC Address Table The Adding a Multicast Address window in Figure 49 is displayed. Figure 49 Adding a Multicast Address Window 5. Select the VLAN Name field and enter the name of the VLAN to receive the multicast frames. Select Enter or press . 6. Select the MAC Address field and enter the MAC address of the multicast stream that will be sending the multicast frames. Select Enter. 7.
AT-S24 Version 2.01 User’s Guide 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. To delete a multicast address from the MAC address table, perform the following procedure: 1. From the Omega Main Menu, select MAC Address Table.
Chapter 5 Configuring Virtual LANs and Quality of Service This chapter explains the Allied Telesyn implementation of the VLAN and Quality of Service (QoS) features of the AT-8200XL Series Ethernet switch.
Configuring Virtual LANs and Quality of Service Overview As the size and traffic on Ethernet networks have grown, new methods have been needed for segmenting the network to improve network performance and speed. One of the principal methods for improving network performance is through the use of VLANs. The VLAN feature allows you to segment your network through software management by creating subnetworks.
AT-S24 Version 2.01 User’s Guide Port-Based VLANs Port-based VLANs are logical groupings of ports. The devices connected to the member ports of a port-based VLAN share a common broadcast domain where the traffic within the VLAN is forwarded only to the member ports. Each port-based VLAN is assigned a unique VLAN ID (VID) when created. When a frame enters a switch port, the VID for that port’s VLAN is associated with the frame.
Configuring Virtual LANs and Quality of Service The table below lists the ports assignments for the Sales and Production VLANs: Sales VLAN (PVID 2) Production VLAN (PVID 3) AT-8224XL Switch 1-6 19-24 The movement of traffic between the two VLANs is accomplished with a router. The router has one connection to each VLAN. One router interface is connected to port 6 on the switch, which is a member of the Sales VLAN. Another router interface is connected to port 24, which is a member of the Production VLAN.
AT-S24 Version 2.01 User’s Guide various VLANs without mixing or leaking data into the wrong VLANs. Now when propagating VLANs across the network you can use one port per switch for connecting all VLANs on the switch to another 802.1Qbased switch. IEEE 802.1Q and 802.3ac Standards. This flexibility comes from the ability to included a VLAN tag, in the form of a VID, to an Ethernet frame (802.3ac), and the ability of NICs, switches, and routers to act upon these VIDs (802.1Q). The 802.
Configuring Virtual LANs and Quality of Service If the connected device is a legacy device (i.e., a device that does not support or act upon VLAN tagging), there are addition methods for handling the frame. As described in the port-based VLAN section, an untagged incoming frame needs to have a VID inserted or associated with it so that the frame can be properly forwarded throughout switch.
AT-S24 Version 2.
Configuring Virtual LANs and Quality of Service The AT-8224XL Switch has two VLANs: Accounting and Manufacturing. The port assignments for the VLANs are as follows: Accounting VLAN (PVID 2) Manufacturing VLAN (PVID 3) Untagged Ports Tagged Ports Untagged Ports Tagged Ports 1 to 6 16, 18 20, 22, 24 16, 18 The Accounting VLAN, assigned a PVID value of 2, contains a total of 6 untagged ports. The VLAN also has two tagged ports, Port 16 and Port 18.
AT-S24 Version 2.01 User’s Guide Port 16 on the AT-8224XL Switch and port 9 on the AT-8324 Switch function as the uplink ports that interconnect the two switches. To allow the VLANs to span across the switches, these uplink ports are output enabled for every configured VLAN on the switch. Therefore, when a broadcast packet is received on any port (representing a packet on any VLAN), it is transmitted through the uplink port.
Configuring Virtual LANs and Quality of Service Creating a Port-based or Tagged VLAN Only one VLAN is defined by default on an AT-8200XL Series Switch. This VLAN is named Default VLAN. The Default VLAN is assigned a VLAN ID and PVID of 1. All the ports on the switch are initially port-based (untagged) members of the Default VLAN. The procedure for creating a new VLAN consists of three phases: ❑ Phase 1: — Name the VLAN. — Assign a VLAN ID (VID) number to the VLAN.
AT-S24 Version 2.01 User’s Guide 2. Select Virtual LAN definitions. The program displays the VLANs window. This window lists the VLANs that currently exist on the switch. The window provides the name of each VLAN along with the ports on the switch that are members of the VLAN. Figure 54 is an example of the window. Figure 54 VLANs Window The example shows that there are three VLANs on the switch: Default VLAN, Accounting, and Manufacturing.
Configuring Virtual LANs and Quality of Service 3. Select Add new table entry. The VLAN Configuration window shown in Figure 55 is displayed. You use this window to specify the parameters for the new VLAN, such as its name and the ports on the switch that will be members of the VLAN. Figure 55 VLAN Configuration Window 4. In the VLAN Name field, enter a name for the new VLAN (for example, Marketing). Select Enter or press .
AT-S24 Version 2.01 User’s Guide 6. In the All Ports on VLAN field, specify both the tagged and untagged ports that are to be members of this new VLAN on the switch. Select Enter or press . 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. Single Port Range of Ports 1, 4, 6-10 Ports on expansion modules, if installed, are included by default in the Ports on VLAN field.
Configuring Virtual LANs and Quality of Service 3. Select one of the existing VLANs that contains an untagged port that you have assigned to the new VLAN. The VLAN Configuration window for the selected VLAN is displayed. An example is shown in Figure 56. The example is for the Default VLAN. Figure 56 VLAN Configuration Example for the Default VLAN 4. Modify the All Ports on VLAN field so that it no longer includes the untagged ports that you have assigned to the new VLAN. Select Enter or press .
AT-S24 Version 2.01 User’s Guide A window is displayed that lists each port on the switch and the VLAN whose VID matches the port’s PVID. Figure 57 is an example of the window. The example shows that the PVID for all of the ports on the switch match the VID of the Default VLAN and, thus, that they all belong to the Default VLAN. Figure 57 Port to VLAN Configuration Window 3. Select one of the untagged ports that you specified in Phase 1 to be a member of the new VLAN.
Configuring Virtual LANs and Quality of Service Verifying the VLAN Configuration Before you begin to use a new VLAN, you should do the following: ❑ Check to be sure that each untagged port belongs to only one VLAN. If an untagged port belongs to more than one VLAN, you must remove the port from one of the VLANs. This might require that you examine the VLAN Configuration window of each VLAN on the switch. ❑ Check to be sure that the PVID for each untagged port has been changed to match the VID of its VLAN.
AT-S24 Version 2.01 User’s Guide Creating an Example VLAN The procedures in this section create the Accounting VLAN in the AT8224XL Switch illustrated in Figure 52 on page 107. This VLAN will contain ports 1 through 6 as untagged ports and ports 16 and 18 as tagged ports. For the purposes of this example, it will be assumed that you are creating the VLAN on an AT-8224XL switch and that the only VLAN currently existing on the switch is the Default VLAN.
Configuring Virtual LANs and Quality of Service Phase 2 Now that you have defined the new Accounting VLAN, you must reconfigure the existing VLANs by removing the untagged ports that you have assigned to the new Accounting VLAN. To accomplish this, perform the following procedure: 1. From the Omega Main Menu, select Virtual LAN/QoS. 2. From the Virtual LAN/QoS menu, select Virtual LAN Definition. 3. Select the Default VLAN. The VLAN window for the Default VLAN is displayed.
AT-S24 Version 2.01 User’s Guide 5. Select Accounting. The ports PVID is changed to match the Accounting VLAN’s VID. (With a local or Telnet management session, the Port to VLAN Configuration window is automatically refreshed. With a web-based session, you must refresh the window manually by returning to the Virtual LANs/QoS menu and selecting Port to VLAN configuration.) 6. Select port 2. 7. Select the Accounting VLAN. 8.
Configuring Virtual LANs and Quality of Service Modifying a Port-based or Tagged VLAN This procedure explains how to add or delete ports from an existing port-based or tagged VLAN. You can also change a port from untagged to tagged, or vice versa. Note You cannot modify the VLANs that have been created using the multiple VLAN mode, which is explained in Activating and Deactivating the Multiple VLAN Mode on page 124. To modify a VLAN, perform the following procedures. Phase 1 1.
AT-S24 Version 2.01 User’s Guide Phase 2 If you added one or more untagged ports to the VLAN, you must removed the ports from their current VLAN assignment; otherwise the untagged ports will be members of more than one VLAN. This procedure is explained in Creating a Port-based or Tagged VLAN, Phase 2 on page 113. If you removed any untagged ports from the VLAN, you must manually reassign them to another VLAN. This involves modifying the VLAN to which you want to reassign the untagged ports.
Configuring Virtual LANs and Quality of Service Deleting a Port-based or Tagged VLAN Deleting a port-based or tagged VLAN from a switch consists of two procedures. Phase 1 consists of deleting the VLAN. Phase 2 involves assigning the ports in the deleted VLAN to another VLAN. Phase 1 To delete a VLAN, do the following: 1. From the Omega Main Menu, select Virtual LANs/QoS. The Virtual LAN/QoS menu in Figure 53 is displayed. 2. Select Virtual LAN definitions.
AT-S24 Version 2.01 User’s Guide 6. If you moved the ports back to the Default VLAN, no further steps are required. The VLAN has been deleted and you have reassigned the untagged ports to the Default VLAN. However, if you reassigned the ports to a VLAN other than the Default VLAN, you must perform the additional step of modifying the PVID of the ports to match the VID of their new VLAN. This can be accomplished by performing the procedure in Creating a Port-based or Tagged VLAN, Phase 2 on page 113.
Configuring Virtual LANs and Quality of Service Activating and Deactivating the Multiple VLAN Mode The multiple VLAN mode is designed to simplify the task of configuring the switch in network environments where each port needs to be in its own VLAN. Rather than having to create each VLAN separately, you can use this mode to create the VLANs automatically. When activated, the mode assigns each port to a separate VLAN. The mode assigns a name to each VLAN and a VID number based on the port number.
AT-S24 Version 2.01 User’s Guide Figure 58 illustrates several of the VLAN assignments on an AT-8224XL Switch operating in multiple VLAN mode.
Configuring Virtual LANs and Quality of Service Figure 53 illustrates a network that uses several AT-8224XL Switches and an AT-9006SX/SC Switch to provide individual end nodes access to a WAN. The example shows three AT-8224XL Switches, each of which is operating in the multiple VLAN mode.
AT-S24 Version 2.01 User’s Guide This procedure explains how to activate or deactivate the multiple VLAN mode on an AT-8224XL or AT-8216FXL Switch. 1. From the Omega Main Menu, select Virtual LANs/QoS. The Virtual LAN/QoS menu in Figure 53 on page 110 is displayed. 2. Select Change to VLAN Mode (802.1Q Vlan or Multiple Vlan). The prompts in Figure 60 are displayed. Figure 60 Prompts for Activating/Deactivating the Multiple VLAN Mode 3. To activate the mode, select Multiple VLAN Mode.
Configuring Virtual LANs and Quality of Service Assigning the CPU Management Port to a VLAN This section contains the procedure for assigning the CPU management port to a VLAN. By default, the CPU management port is assigned to the 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 on the switch to which your remote management stations are connected.
AT-S24 Version 2.01 User’s Guide Configuring Port Priority Queueing The AT-8224XL and AT-8216F Series Ethernet Switches support the IEEE 802.1p standard and Quality of Service (QoS). QoS can be of importance in network environments where there are time-critical applications, such as voice transmission or videoconferencing, that can be adversely affected by packet transfer delays. Prior to QoS, network traffic was handled in a best-effort manner.
2. From the Virtual LANs/QoS menu, select Assign Port Priority. The Omega program displays a list of the ports on the selected switch. 3. Select a port number to display the following screen (Port 4 is used as an example): Figure 62 Port Priority Setting Window 4. Adjust the port priority settings as desired. To override the priority levels specified in the tagged frames received on the port, select Override VLAN Tag Priority.
AT-S24 Version 2.01 User’s Guide Configuring Switch Priority Queuing When a tagged frame enters a port on the switch, the frame is placed in one of two priority queues, normal or high, according to the priority level as specified in the frame or by the port priority level, which you can set. (See the procedure Configuring Port Priority Queueing on page 129 for instructions on configuring a port’s priority level.) Packets in the two queues are handled in a round robin manner.
Configuring Virtual LANs and Quality of Service The window in Figure 63 is displayed. Figure 63 Priority Weight Configuration Window 3. Select the desired switch priority ratio. The default is Mode 4, where the switch can transmit up to 6 high priority tagged packets before searching for a normal priority packet. Mode 8 causes the switch to defer handling packets in the normal priority queue so long as there are any packets in the high priority queue. 4. 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 monitoring the performance of your network or 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 Ethernet Statistics 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 Ethernet Statistics. The Receive Statistics Graph window for the switch is displayed. Figure 64 is an example of the window.
AT-S24 Version 2.01 User’s Guide Note You can also view an individual port’s receive statistics by selecting the Port status and configuration option from the Main Menu, and choosing a port number. 3. To clear the graph, select Zero all statistics counters on the entire system. 4. Return to the Main Menu. Table 6 defines the received frame statistics. Table 6 Received Ethernet Frames Frame Type Description Received Good Frames Total number of frames received by the switch since the last reset.
Displaying Ethernet Statistics Figure 65 Graph of a Port’s Received Frames Figure 66 Sample Graph of a Single Frame Type on All Ports 136
AT-S24 Version 2.01 User’s Guide 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, Ethernet Statistics. The Receive Statistics Graph in Figure 64 on page 134 is displayed. 2. Select Transmit Statistics. The window in Figure 67 is displayed. The window displays the transmit frame statistics for the entire switch.
Displaying Ethernet Statistics Table 7 defines the statistics. Table 7 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.
AT-S24 Version 2.01 User’s Guide Displaying RMON Statistics for a Switch To display the RMON statistics for a switch, perform the following steps: 1. From the Main Menu, select Ethernet statistics. The Receive Statistics Graph in Figure 64 on page 134 is displayed. 2. Select RMON statistics. The RMON Statistics Graph window is displayed. An example of the window is shown in Figure 68. Figure 68 RMON Statistics Graph Window 3. To clear the graph, select Zero all statistics counters from the entire system.
Displaying Ethernet Statistics Displaying RMON Statistics for a Port To display RMON statistics for a specific port, perform the following procedure: 1. From the Main Menu, select Ethernet statistics. The Receive Statistics Graph shown in Figure 64 on page 134 is displayed. 2. Select Port RMON Statistics. The Omega interface displays a list of the ports on the switch. 3. Select a port to display a graph similar to Figure 69. Figure 69 Sample RMON Statistics Graph for a Port 4.
AT-S24 Version 2.01 User’s Guide 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 might want its statistics to accumulate from a fresh start.
Displaying Ethernet Statistics 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 the interface and making changes to the configuration settings of a switch.
Configuring the Omega Interface Creating an Omega Password To prevent unauthorized individuals from accessing the Omega interface and altering a switch’s configuration settings, you can assign a password to the program. Any person who starts the interface will be required to enter the password, regardless of how they access the Omega (i.e., RS232 port, web browser, Telnet program, or SNMP management program). The default value for the Omega interface is no password.
AT-S24 Version 2.01 User’s Guide 3. Enter a new password for the Omega interface in the Password field at the top of the window. Select Enter or press . The password can be up to 20 characters. The password displays as a series of asterisks. To delete the current password but not assign a new password, enter a space in the Password field. Note The password can consist of the letters A to Z in uppercase and lowercase, as well as the numbers 1 to 9.
Configuring the Omega Interface 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.
AT-S24 Version 2.01 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 switch by preventing unauthorized individuals from accessing the switch and making changes to the switch’s configuration settings. 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 Switch Software on page 149 " Uploading and Downloading System Configuration Files on page 152 Upgrading the Switch Software Allied Telesyn periodically updates and revises the AT-S24 software for your AT-8216FXL, AT-8224XL, and AT-8288XL Series Fast Ethernet Switches. The latest version of the software is posted on the Allied Telesyn web site for you to download onto your switches.
Upgrading Switch Software and Configuration Files Upgrading the software in a switch involves using the Download Password. This password is required when upgrading the software except when using the XMODEM software upgrade feature. The default download password is ATS24. The password is case sensitive. Changing this default password to an unique password will prevent unauthorized personnel from changing the software on the switch.
AT-S24 Version 2.01 User’s Guide Note This procedure can also be performed using the XModem software update to this system selection in the Administration menu of a local Omega session. Using TFTP to Upgrade Software If you use TCP/IP protocol on your network, you can use a workstation and TFTP software to upload new software to the switch or download a copy of the current software from the switch.
Upgrading Switch Software and Configuration Files Uploading and Downloading System Configuration Files The switch configuration information can 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 AT-S24 Default Settings This appendix lists the AT-S24 Version 2.01 factory default settings. Settings Default IP Address Subnet Mask 0.0.0.0 0.0.0.
AT-S24 Default Settings Settings Default Omega Omega Password No password Omega Time Out Value 5 minutes Local Access Enabled Remote Access (Telnet or SNMP) Enabled Web-based Access Enabled Twisted Pair Ports (AT-8224XL and AT-8288XL) Status Enabled Duplex Mode Auto-negotiation Speed Auto-negotiation Backpressure Disabled Flow Control Disabled Broadcast Packets Forwarded Security Automatic Fiber Optic Ports (AT-8216F and AT-8288XL) Status Enabled Duplex Mode Full-duplex Speed 100 Mbps Security Automatic
Appendix B Spanning Tree Protocol Concepts This appendix provides a brief explanation of the STP as implemented by Allied Telesyn on the switches. For detailed information on the operation of the STP, consult Section 4 of IEEE Std 802.1D, ISO/IEC 10038: 1993. The Fast Ethernet switches and the AT-S24 software implement the IEEE 802.1D STP. The STP provides a network with robustness and allows network administrators to easily change their network topology.
Spanning Tree Protocol Concepts 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-S24 Version 2.01 User’s Guide Spanning Tree Protocol Parameters Several configuration parameters control the operation of the Spanning Tree Protocol. Table 8 describes the parameters and lists each parameter’s default settings for the switch. The port numbers include the twenty-four 10Base-T or 100Base-TX ports.
Spanning Tree Protocol Concepts 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 C Supported Platforms Table 9 lists the Allied Telesyn Fast Ethernet switches supported by the AT-S24 Version 2.01 management software. Table 9 Switch Models Model1 Number of Ports Type of Ports Type of Connector Type of Cable2 Maximum Distance3 AT-8216FXL/MT 16 100Base-FX MT-RJ Multimode fiber optic 2 kilometers (1.25 miles) AT-8216FXL/VF 16 100Base-FX VF-45 Multimode fiber optic 2 kilometers (1.
Supported Platforms Table 10 lists the optional expansion modules supported by the software. Table 10 Optional Expansion Modules Model Number of Ports Type of Ports Type of Connector Type of Cable1 Maximum Distance2 AT-A14 1 100/1000Base-T RJ-45 Category 5 or better twisted pair3 100 m (328 ft) AT-A15/SX 1 1000Base-SX SC Multimode fiber optic 550 m (1,804 ft) AT-A15/LX 1 1000Base-LX SC Single-mode fiber optic 10 km (6.
Index (Entries in italic are menu selections.) 802.
Index default settings reassigning switch default values, 55 Default VLAN, 110 Delete MAC Address, 99 deleting multicast addresses, 99 port trunk, 77 static MAC addresses, 95 VLAN, 122 Destination Port, 79 DHCP Configuration, 43 DHCP server, 40 Diagnostics, 59 diagnostics, running, 59 Disable Spanning Tree for all Ports, 47 disabling port mirroring, 80 displaying MAC address table by address, 89 MAC address table, 87 MAC addresses by port, 88 port status, 66 received frame statistics, 134 RMON statistics,
AT-S24 Version 2.
Index displaying, 92 statistics graphs interpretation, 141 received frames, 134 resetting counters, 141 RMON, 139, 140 transmitted frames, 137 transmitted frames, description, 138 Status port, 67 stop bits, 57 STP, see spanning tree protocol subnet mask, 43 switch configuring IP parameters, 40 configuring the RS232 port, 56 connecting to remote, 33 MAC address, 59 naming, 53 reassigning default settings, 55 resetting, 54 upgrading AT-S24 software, 149 System Configuration, 35, 56 System switch configuratio
