________________________________________________________________________________ Switch 4060: Management Software Version 2.52 This document provides the following information: 1. Legal rights 2. Recommendations when using this release 3. Known problems with this release 4. Known Incompatibility Issues 5. Documentation errors and omissions 6. Network management software support 7. 3Com's World Wide Web site ________________________________________________________________________________ 1. Legal rights IMPORTANT: READ THIS BEFORE INSTALLING OR USING THIS SOFTWARE You should carefully read the terms and conditions of the Software License Agreement. This text is contained in a file called !license.txt. 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. Recommendations when using this release The version 2.52 software provides support for the 3Com Switch 4060 (3C17709) only. The Switch 4060 v2.52 software only operates on the Switch 4060. It does not operate on any other 3Com Switch. 3Com recommends that you use the Bulk Agent Upgrade feature found in the 3Com Network Supervisor to easily upgrade all the 3Com Switches in your network. If this is not possible, select the TFTP upgrade. Only attempt an upgrade via the Software Update Utility if all other options are not viable. Supported Expansion Modules 3C17710 – 4 port 1000BASE-SX module 3C17711 – 4 port 1000BASE-T module 3C17712 – 4 port 1000BASE-LX module 3C17714 – 4 port GBIC module Replacing Expansion Modules When the expansion module is replaced by another module of a different type, the configuration of the expansion module will not be completely reset to factory defaults. Specifically the following module associated parameters will not be reset: Static addresses Resilient links IGMP router ports RMON alarm variables Spanning Tree port data It is recommended that all module configuration should be reviewed after the expansion module has been replaced. Auto-MDIX Auto-MDIX is not available if auto-negotiation is disabled on a port. That port will only operate in MDIX mode. Serial Cable When using a serial cable you must ensure that it is wired correctly as described in Appendix B of the Getting Started Guide. TFTP Upgrades Note that when initiating a TFTP upgrade using the web interface or CLI, if an incorrect TFTP server IP address is entered you will not be able to correct the IP address until the TFTP upgrade operation has timed out. The default time out period of 20 minutes. ________________________________________________________________________________ 3. Known problems with this release - With IGMP snooping enabled, for VLANs other than the default VLAN, IP multicasts will only be forwarded within a VLAN if a multicast router acting as a source for IGMP queries is present in that VLAN. - Do not disable IGMP snooping on the unit when there are hosts in the segments subscribing to multicast IP groups. Hosts may be unable to re- subscribe to the same multicast IP group, for more than 5 minutes, or until the unit is re-booted. - Pause packets are counted incorrectly. Received pause packets are included in the transmit packet counters. Transmitted pause packets are included in the receive packet and octet counters. - If a port is being blocked by Spanning Tree Protocol (STP), and STP is disabled, then the port remains blocked until the Switch is reset. - 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. - Internet Explorer 5 - If ‘Ignore font styles specified on Web Pages’ or ‘Ignore font sizes specified on Web Pages’ are selected, then the appearance of the web interface will be unpredictable. 3Com rec- ommends that neither of these tools are selected (options are found under Internet Explorer 5 menu Tools > Internet Options > Accessibility > Formatting). - BOOTP address does not renew after 1 hour. The IP address is dropped and replaced with 0.0.0.0. The IP address is lost for only a few minutes every hour but is re-established. - If you allocate a new IP address to the default VLAN on a hub that is currently running, you should remove the IP interfaces and/or disable RIP until the DHCP/BOOTP/AutoIP process completes. - Version 2.50 and above, have Spanning Tree enabled by default. - If you have a QoS profile applied to a port with a service level that remarks the DSCP field, then all the incoming traffic will be remarked. Traffic which is identified by the service level profile will be marked accordingly. Traffic that does not match the service level profile will be remarked with a DSCP value of 0 (best effort). The effect of this is that traffic which identified as "no mark" will be remarked. To avoid this do not mix "DSCP marking" and "DSCP No-change" service levels. - 802.1p (packet prioritization) overwriting. If the ingress port is untagged and the egress port is tagged, the packet's 802.1p priority will be marked appropriately. However, if the ingress port is tagged and the egress port is tagged, the packet's 802.1p priority will not be remarked. - DSCP value 0 cannot be used as a QoS classifier. - Ethertype IP (0x800) and ARP (0x806) cannot be used as QoS classifiers. - The OK button in the System / Cache Config / Summary of the web browser interface does not function properly if you have Windows 95 loaded and are using Internet Explorer version 5.5. The status may change while the summary screen is open and reflect an inaccurate reading. - When issuing a PING command, the PING Time To Live (TTL) value is reported incorrectly as the first byte of the IP address. - In some instances with RIP disabled on the Switch, the protocol continues to learn about its RIP neighbors. - If the last active port on a VLAN becomes inactive, the IP interface associated with the VLAN is not marked as inactive. As a result, the VLAN IP interface will appear as "enabled" in the Command Line Interface (CLI), even though it has been physically disabled. The effect of this is that the Switch will continue to advertise routes learned on the VLAN. This could cause networks to become unreachable. - If Spanning Tree is disabled on a unit, each port on the unit must, at a minimum, belong to an untagged VLAN. If desired, ports can also belong to multiple tagged VLANs. ________________________________________________________________________________ 4. Known Incompatibility Issues An incompatibility exists in the default settings for Link Aggregation between the Switch 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, as TCMP is not supported on the Switch. - 2 You must disable auto-negotiation on all ports on the Switch 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 3Com Web site for more information about configuring aggregated links. An incompatibility exists when changing link speed from 10 Mbps Half Duplex to 100 Mbps half duplex. If auto-negotiation on the Switch is disabled and the link speed on the Switch is changed from 10 Mbps half duplex to 100 Mbps half duplex, there is a possibility that the link partner will not detect the change. The link will have to be broken and reconnected before the link partner will detect the speed and change link speed to 100 Mbps half duplex. ________________________________________________________________________________ 5. Documentation errors and omissions No known errors. ______________________________________________________________________________ 6. Network Management software support 3Com Network Supervisor Version 3.5. To get the latest device support, use the Live Update function provided with Network Supervisor to get information about and install any new service pack or upgrade quickly and simply. To do this, first install Network Supervisor. Then click Live Update in the Network Supervisor tool bar, or select Live Update from the Tools menu, to automatically retrieve and install the latest service pack or upgrade. You can also download the latest service pack or upgrade from the 3Com web site at http://www.3com.com/3ns/. 3Com Network Supervisor Advanced Package Version 1.0. This agent version is supported by the 3Com Network Supervisor Advanced Package which can bulk-update your devices. Check http://www.3com.com/3ns_ap for details. ________________________________________________________________________________ 7. 3Com's World Wide Web site Access the latest networking information on the 3Com Corporation World Wide Web site by entering our URL into your Internet browser: http://www.3com.com/ ________________________________________________________________________________ (R) means registered trademark. 3Com is a registered trademark of 3Com Corporation. Other trademarks are the property of their respective owners. Document Number: DRA1770-9CAA01 Issued: April 2002 Copyright (c) 2002 3Com Corporation. All Rights Reserved.