=============================================================================== 3Com(R) SuperStack(R) 3 Switch 4200 Series, Software version 1.02 (Product #: 3C17300, 3C17302) =============================================================================== This document provides the following information: 1. Legal 2. Points to Note when using the Switch 4200 Series 3. Known Problems with the Management Software 4. Known Incompatibility Issues 5. 3Com Network Supervisor =============================================================================== 1. Legal =============================================================================== __________________________________________ IMPORTANT: READ BEFORE USING THIS SOFTWARE __________________________________________ You should carefully read the terms and conditions of the Software License Agreement that is displayed when you install this software. Your legal rights are defined therein. USE OF THIS SOFTWARE INDICATES THAT YOU ACCEPT SUCH TERMS AND CONDITIONS. If you do not agree with such terms and conditions, do not use this software. =============================================================================== 2. Fixes for known faults =============================================================================== - The switch would reset when ping'ed by ICMP echo request with a large payload This has been corrected. - Further protection against SNMP denial of service attacks. - When a port has rapid spanning tree enabled and the link connected to that port goes down and then quickly back up, the port could be left in the spanning tree 'blocking' state. This has been fixed so that the port will revert to its correct spanning tree state. - The 4200 responded to UDP multicast packets to the ALL ROUTERS IP address (224.0.0.2) with a "Destination Unreachable" ICMP packet (excepting IGMP packets). This could add unnecessary ICMP packets to a network when certain other protocols were being used (e.g. the CISCO HSRP protocol). =============================================================================== 3. Points to Note when using the Switch 4200 Series =============================================================================== - Configuring Link Aggregations When creating an aggregation between two systems, the ports in the aggregation must not be physically connected together until the aggregation has been correctly configured at both ends of the link. Failure to configure the aggregation at both ends before physically connecting the ports can result in a number of serious network issues such as lost packets and network loops. - Telnet and HyperTerminal Accessing the Command Line Interface via Telnet or Windows HyperTerminal using TCP/IP may not work correctly on some platforms unless it has been configured to send line feeds with carriage returns. To set this for Telnet enter "set crlf" when in command mode. To set this for HyperTerminal click on the "Settings" tab in the Properties screen, click on "ASCII Setup.." and ensure that Send line ends with line feeds is checked within the ASCII Sending section. You should not configure HyperTerminal in the above way if you are using a console cable to make a direct connection to the Switch. - Serial Web Utility If the error "STARTWEB caused an invalid page fault in module ICMP.DLL......." is displayed after launching the Serial Web Utility you need to obtain the icmp.dll file dated 14.10.1996 from Microsoft and copy it to your Windows System directory. - Using VLANs The Switch 4200 uses Open VLANs. This means the Switch does not perform any input filtering based on IEEE 802.1Q VLAN ID tags. If a packet is received with a VLAN ID tag, it will be accepted even if the receiving port is not a member of that VLAN. The packet will then be switched as usual. If the destination address has already been learned, the packet will be forwarded to the relevant output port. If the destination address is unknown, the packet will be flooded to all ports belonging to the VLAN specified by the tag. =============================================================================== 4: Known Problems with the Management Software =============================================================================== - When setting up a SLIP IP address and an IP address for the unit you must ensure that the assigned IP addresses are different. - If you use Netscape to manage your Switch you may experience problems when trying to change the user password. 3Com recommends that if you use Netscape and you need to change the password you do so via the CLI command. To do this, from the Web interface Device View, use the System > Telnet > Connect operation to start a Telnet connection and then use the "security device user modify" CLI command. - If the error, "The previous command window is still active" is displayed when using the Web interface, you must close that window before you can select another operation. You should then press Reload (Netscape) or Refresh (Internet Explorer) in your Web browser. - The Switch 4200 Web interface can only be accessed by one of the following Web browsers: - Microsoft Internet Explorer v4.0, v5.0 and v5.5 - Netscape Communicator v4.5, v4.6 and v4.7 - The Switch 4200 Web interface can be accessed on any of the following PC operating systems: - Microsoft Windows 95 - Microsoft Windows 98 - Microsoft Windows NT v4.0 - Microsoft Windows 2000 - Flow control using RTS/CTS signals on the serial port is not functional and in some situations may result in loss of data over modem connections. =============================================================================== 5: Known Incompatibility Issues =============================================================================== - An incompatibility exists in the default settings for Link Aggregation between the Switch 4200 and the following 3Com products: - Switch 4007 - Switch 3900 - Switch 9300 - CoreBuilder 9000 family - CoreBuilder 9400 - CoreBuilder 3500 The products listed above disable auto-negotiation when a port is added to an aggregated link (trunk). In order for link aggregation (trunking) to work, ports at either end of an aggregated link (trunk) must be identically configured. To resolve the incompatibility, you must complete the following steps: 1. On any of the switches listed, you must disable TCMP on a trunk (aggregated link) that connects to a Switch 4200, as TCMP is not supported on the Switch 4200 Series. 2. You must disable auto-negotiation on all ports on the Switch 4200 that you want to place in an aggregated link before you place them in the aggregated link. Refer to the Management Interface Reference Guide on the CD-ROM that accompanies the Switch 4200 Series for more information about configuring aggregated links. NOTE: On the Switch 4200 Series, aggregated links are only supported on the 10/100/1000 Mbps ports. =============================================================================== 6: 3Com Network Supervisor =============================================================================== 3Com Network Supervisor provides powerful yet easy-to-use network management. Focused on the needs of small to medium enterprises, it enables you to manage your network more efficiently. To provide this support for your Switch 4200, you must download the latest version of 3Com Network Supervisor and the latest Service Pack. To do this, visit: http://www.3com.com/3ns For HP OpenView users the Superstack 3 Switch 4200 Series (and all other 3Com managed products) are fully supported by the 3Com Integration Kit for HP OpenView (3C15300). _______________________________________________________________________________ (R) means registered trademark. (TM) means trademark. 3Com and SuperStack are registered trademarks of 3Com Corporation. Other trademarks are the property of their respective owners. Document Number: DRA1730-0AAA02 Issued: September 2002 Copyright 2002 3Com Technologies.