3Com Switch 3226 User Manual

®
SUPERSTACK 3 SWITCH 3226 AND SWITCH 3250  
SOFTWARE VERSION 1.02 RELEASE NOTES  
accompanies your Switch and on the 3Com Web  
site)  
Related Documentation  
Please use these notes in conjunction with the following  
documents:  
You can obtain the latest technical information for your  
Switch, including a list of known problems and  
solutions, from the 3Com Knowledgebase:  
SuperStack 3 Switch 3226 and Switch 3250 Getting  
Started Guide”  
Part number: DUA1750-0AAA01  
(supplied with your Switch and in PDF format on the  
3Com Web site)  
Software License Agreement  
SuperStack 3 Switch 3226 and Switch 3250  
Implementation Guide”  
Before you use the Switch software, please ensure that  
you read the license agreement text. You can find the  
license.txt file on the CD-ROM that accompanies your  
product, or in the self-extracting exe that you have  
downloaded from the 3Com Web site.  
Part number: DUA1750-0BAA01  
(supplied in PDF format on the CD-ROM that  
accompanies your Switch and on the 3Com Web  
site)  
SuperStack 3 Switch 3226 and Switch 3250  
Management Quick Reference Guide”  
Part number: DQA1750-0AAA01  
About this Software Version  
This software provides support for the following:  
(supplied with your Switch and in PDF format on the  
3Com Web site)  
Switch 3226 (3CR17500-91)  
Switch 3250 (3CR17501-91)  
SuperStack 3 Switch 3226 and Switch 3250  
Management Interface Reference Guide”  
Part number: DHA1750-0AAA01  
The software does not operate on any other 3Com  
Switch.  
(supplied in HTML format on the CD-ROM that  
Part No. DNA1750-0AAA02  
Published April 2004  
 
Errors and Omissions  
3
Data is invaliderror with no explanation. The  
new firmware returns an error describing the field  
containing the error and then returns to the page  
allowing the error to be corrected.  
The LACP PartnerIDfield now reports  
LACP disabledif the protocol is disabled or not  
supported on the port.  
Traffic Prioritization  
Command Line Interface  
In previous versions of the software, the DSCP  
prioritization of the CS6 code point defaulted to  
802.1d priority 7. This has been corrected. The CS6  
code point now defaults to 802.1d priority 6.  
The output of the bridge port summaryCLI  
command has been improved:  
The stpStatefield has been replaced by Link  
and Spanning Treecolumns to more accurately  
report the active port status.  
VLANs  
In previous versions of the software, removing a port  
from a VLAN left static entries bound to the  
port-VLAN. This has been fixed. When you remove a  
port from a VLAN all static entries for that port-VLAN  
will be deleted.  
The fwdTransitionsfield has been renamed  
Forward Trans.  
The LACP PartnerIDfield now reports  
LACP disabledif the protocol is disabled or not  
supported on the port.  
802.1x Network login authentication:  
The output of the bridge port detail CLI  
command has been improved:  
In previous versions of the software, authentication  
attempts for valid users would occasionally fail.  
The bug causing this has been fixed.  
The stpStatefield has been added. This shows if  
the Spanning Tree Protocol (STP) has been enabled  
on the port. The field will read Enabledif STP is  
enabled on the port, even if STP is disabled globally  
on the unit.  
The user name reported in the CLI command  
security network access detailwas  
occasionally displayed with incorrect trailing  
characters. This has been fixed. The user names are  
now displayed correctly.  
The currently active spanning tree state for the  
port is reported in the Spanning Treecolumn  
of the VLAN table. Please note that the product  
supports a single spanning tree state for all VLANs  
as per the 802.1d Spanning Tree specification. It  
does not support 802.1s Spanning Tree per VLAN.  
 
4
SUPERSTACK® 3 SWITCH 3226 AND SWITCH 3250 SOFTWARE VERSION 1.02 RELEASE NOTES  
the current firmware can be verified by running the  
system summarycommand:  
RMON history statistics and Web port history  
statistics  
A bug in previous software versions prevented  
statistics being generated for the first timing interval.  
This has now been fixed.  
Static port security and the bridge MAC address  
table  
If static port security is enabled on a port with more  
than 200 addresses the previous software versions  
would report that the command had failed, but  
would add the first 200 addresses to the bridge  
address table and move the port into the secure state.  
In previous software versions the 1 hour statistics did  
not appear until the unit had been running for  
2 hours. The statistics would then be correctly  
generated on an hourly interval. This has now been  
fixed. 1 hour statistics are available after 1 hour.  
In addition, disabling port security would occasionally  
fail to flush the secure addresses from the bridge  
address table.  
Similarly the 6 hour statistics would not appear until  
the unit had been running for 12 hours and then  
update every 6 hours. This has now been fixed.  
6 hour statistics are available after 6 hours.  
The current software correctly rejects the attempt to  
move the port into secure mode if there are more  
than 200 addresses. When this condition occurs it  
does not change the port security mode or make any  
of the addresses secure. In addition, disabling port  
security always removes all static bridge address  
entries from the port.  
Software Version Number  
The software version number reported by the  
system control swapSoftwareCLI command  
is displayed incorrectly in previous versions of the  
software. For example, software version 1.01 displays  
the version as 1.1.  
Binding an ACL to a port fails occasionally  
When running the 1.02 or later software, it displays  
all software versions correctly, including 1.00 and  
1.01.  
In previous versions of the software, the unit would  
incorrectly count the number of ACL rules when  
trying to determine whether the ACL could be bound  
to the port.  
The system control swapSoftwarecommand  
does not include an indication of the encryption level  
supported by the firmware; the firmware supporting  
the normal encryption level 1.02, and the strong  
encryption firmware 1.02s both appear as 1.02  
when using this command. The encryption level of  
This has been fixed. In the current software version  
the software correctly allows for an ACL to be bound  
if it is within the limits of the particular port.  
 
Updating the Switch Software  
5
See “Access Control Lists” in the “Points to Note  
when using the Switch 3226 and Switch 3250”  
section of this document for further details.  
To update the software on the Switch, do the follow-  
ing:  
1 Locate the software update for the Switch and run  
the (filename.exe) executable file.  
3Com Network Supervisor Discovery  
2 If necessary, download the TFTP server applications  
into the management station.  
When using 3Com Network Supervisor with previous  
versions of the software, 3Com Network Supervisor  
was unable to display the unit on the network  
topology. This will prevent you from using 3Com  
Network Supervisor to update the software from 1.00  
or 1.01.  
3 Install the TFTP server (file name 3ts01_04.exe) on  
a Microsoft Windows 95, 98, NT, 2000 or XP  
machine.  
4 Launch the TFTP server application.  
5 Point the Upload/Download default directory on the  
TFTP server to the directory where the upgrade file is  
located.  
This has been fixed. The Switch running software  
version 1.02 and above can be discovered successfully  
using 3Com Network Supervisor and the correct  
network topology generated.  
6 Make sure the Switch being upgraded has an IP  
address assigned to it.  
7 Telnet to the Switch.  
Updating the Switch Software  
a To Telnet to the Switch, click Start in Microsoft  
Software Updates are the bug fix and maintenance  
releases for the version of software initially purchased  
with the product. In order to access these Software  
Updates you must first register your product on the  
3Com Web site at:  
Windows 95, 98, NT, 2000, or XP machine.  
b Click Run.  
c In the text area, type telnet IP address  
d Click OK.  
8 Press Enter to receive a login prompt.  
9 Log into the Switch management.  
a The default user login is admin.  
First time users will need to apply for a user name and  
password. A link to software downloads can be found  
from this http://eSupport.3com.com/page, or  
located from the www.3Com.comhome page.  
b There is no default password for admin (press  
Enter).  
10 From the main menu, select System, then select  
Control.  
 
 
6
SUPERSTACK® 3 SWITCH 3226 AND SWITCH 3250 SOFTWARE VERSION 1.02 RELEASE NOTES  
11 Select SoftwareUpgrade.  
filename until the TFTP upgrade operation has  
timed out. The default time out period is 1 minute.  
12 Enter the IP address of the TFTP server connected to  
the Switch.  
When attempting to upgrade the software on the  
unit it may occasionally report the following error:  
13 Enter the upgrade file name.  
Error: File service in progress.  
a The message will appear, 'Software Upgrade  
in progress.....'.  
If you encounter this error, please wait a minute  
and try the command again.  
b The entire time the upgrade is in process, the  
Power/Self test LED will flash ON/OFF Green, and a  
series of dots will indicate that the upgrade is  
progressing successfully.  
Points to Note when using the Switch 3226  
and Switch 3250  
c When the software upgrade is complete, the  
Switch will reboot itself.  
Password Recovery  
The password recovery feature allows you to reset the  
admin user password by logging into the unit via the  
console port using the username recoverand  
password recover. If you power cycle the unit  
within 30 seconds then the password will be reset  
and you will be prompted to enter a new password  
on restart. There is no command to disable the  
password recovery feature.  
Points to Note when Upgrading Software  
The Switch ships with a version of software that  
supports up to 56-bit encryption for SSH and SSL  
(HTTPS). For higher levels of encryption including  
168-bit 3DES and 256-bit AES, download the  
strong encryption version of the Switch software  
from the 3Com Web site and install as detailed in  
“Updating the Switch Software” above.  
When you have a strong encryption version of the  
Switch software loaded, the Software Version field  
on the Web interface will show the version  
number of the software followed by the words  
(Strong encryption).  
Configuring Link Aggregations  
When creating a manual 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.  
When initiating a TFTP upgrade using the Web  
interface or CLI, if an incorrect TFTP server IP  
address or software upgrade filename is entered  
you will not be able to correct the IP address or  
 
 
Points to Note when using the Switch 3226 and Switch 3250  
7
3Com recommends that you set individual ports that  
are to be members of an aggregated link to the same  
VLAN membership. This ensures communication  
between all VLANs at all times.  
on only edge ports which will typically have only a  
few addresses.  
If the address of a device is added as a static secure  
address on one port and then it is subsequently  
moved to a different port with security disabled  
then the device may get intermittent network  
connectivity. To fix this problem you should remove  
the address from the original port and consider  
enabling security on the new port.  
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 crlfwhen in command  
mode. To set this for HyperTerminal click on the  
Settings tab in the Properties screen, click ASCII Setup  
and ensure that Send line ends with line feeds is  
checked within the ASCII Sending section.  
When configuring RADIUS using the CLI command  
security radius setupyou should note that  
the wizard does not include a step to configure the  
RADIUS shared secret. You will need to configure  
the shared secret using the security radius  
sharedSecret command before RADIUS will  
operate.  
You should not configure HyperTerminal in the above  
way if you are using a console cable to make a direct  
connection to the Switch.  
The Switch does not log authentication requests or  
support logging to a RADIUS accounting server.  
Please use the logs generated on your RADIUS  
authentication server instead.  
Accessing the Command Line Interface is not possible  
using the default Telnet program supplied with Win-  
dows XP. Use another Telnet program, such as Hyper-  
terminal. See the 3Com Knowledgebase for updates  
and a solution, when available:  
To create a user with administrator privileges when  
using RADIUS device authentication you must  
ensure that user has the “Service-Type” attribute  
set to 15.  
Some RADIUS servers will not authenticate users  
with a blank password, all user accounts should  
have a valid password configured.  
Port Security and Authentication  
When enabling the static port security feature on a  
port the Switch will report static fail if you exceed  
the maximum number of secure addresses (200).  
The unit will not move the port into secure mode.  
3Com recommends that port security be enabled  
Link aggregation and Gigabit ports  
When manually configuring an aggregated link the  
switch may report the following error message:  
 
8
SUPERSTACK® 3 SWITCH 3226 AND SWITCH 3250 SOFTWARE VERSION 1.02 RELEASE NOTES  
No more ports may be added to aggregated  
link.  
physicalInterface ethernet portState  
CLI command  
You should check the configuration of the  
following items on the physical port  
SFP Modules  
port security is disabled on the port.  
When adding or removing SFP modules the switch  
will reset a number of port parameters. 3Com  
recommends that you verify the following port  
parameters after adding or removing an SFP module:  
The VLAN membership of the port matches that  
of the aggregated link  
LACP is disabled.  
Media configuration (auto negotiation, speed and  
No ACL is bound to the port.  
duplex)  
If you attempt to enable LACP on a port which is  
currently a manual member of a link aggregation  
then the following error will be displayed:  
Link Aggregation membership.  
LACP state.  
Spanning tree port parameters.  
VLAN membership.  
Failed to set port 1:50 lacp status  
If you wish the ports to automatically form a trunk  
using LACP then the ports must first be removed  
from the manual aggregation.  
IP Configuration and Routing  
The Switch is optimized to operate as an edge  
router with a single default gateway acting as the  
next hop route to all other subnets.  
If a trunk is disabled by using the bridge  
linkAggregation modify linkStateCLI  
command then the physical trunk member ports  
for the aggregation will be disabled. A side effect  
of the ports being disabled is that they will no  
longer negotiate to become LACP-trunk members.  
If the trunk was formed by LACP then the trunk  
will disappear because it no longer has any  
member ports.  
In larger networks it may take several minutes for  
the unit to learn the correct routing information.  
The unit may have to flush and relearn the routing  
information if there is a topology change in the  
network. During this time the network connectivity  
may be intermittent.  
If the LACP trunk is disabled as above then  
attempting to enable the trunk with the  
linkStatecommand will respond with an error  
that the trunk can not be configured. In order to  
form the LACP trunk you must manually re-enable  
the individual trunk member ports using the  
In certain situations, the Switch will be unable to  
used hardware routing display the following error  
message in the system summary and route table:  
Current network configuration requires use of  
software routing, resulting in degraded  
performance.  
 
Points to Note when using the Switch 3226 and Switch 3250  
9
This message can be caused by one of the  
following situations:  
Reconfiguring an IP interface may cause the RIP  
configuration and static routes settings for that  
interface to be lost.  
if there are more than14 routes whose next hop  
is not the default gateway. 3Com recommends  
reconfiguring the network so that the uplink  
from the Switch goes directly to another layer 3  
router which is configured as the default gate-  
way.  
When adding or modifying an IP interface the CLI  
and Web interface may appear to hang for up to  
30 seconds while the operation takes place.  
When forwarding DHCP and BOOTP requests in a  
multinetted environment, the UDP helper will only  
use the primary IP interface in the forwarded  
requests. This will cause the BOOTP/DHCP server to  
allocate all dynamic addresses from the primary  
subnet of a multinetted VLAN.  
if the unit is unable to contact one or more of  
its next-hop routers then software routing will  
be used. Find the reason why the router cannot  
be contacted and correct the problem.  
if there is no default gateway configured. Con-  
figure a default gateway and check to see if the  
problem is solved.  
If the number of multicast traffic groups on your  
network exceeds the maximum supported by the  
Switch (64) then you may see occasional bursts of  
multicast traffic as the Switch updates its internal  
configuration.  
when the Switch is learning new routes. The  
Switch may take up to a minute to learn new  
routes. The above message may be displayed  
for a short time while a route is learned. This is  
normal behavior.  
Some combinations of IP commands in a  
multinetted environment may cause the IP address  
of interface 1 to become a secondary address.  
Rebooting the unit will reset this interface as the  
primary address. There is no other means of  
clearing this condition.  
When the unit is in the default IP mode of auto it  
will attempt to contact a DHCP server on the  
network to obtain an IP address. If there is no  
DHCP server available on the network then the  
unit will not be accessible using TCP/IP.  
Access Control Lists  
Please use the console to configure the unit with  
an IP address or connect the unit to a network  
with a DHCP server. If using DHCP you will need to  
use a console connection or log information from  
your DHCP server to discover the address which  
has been assigned to the unit.  
When trying to bind an Access Control List (ACL) to a  
port you may see the following error generated:  
Fail to bind port 26 ACL  
This error will appear if:  
 
 
10  
SUPERSTACK® 3 SWITCH 3226 AND SWITCH 3250 SOFTWARE VERSION 1.02 RELEASE NOTES  
The ACL which is being bound has more rules than  
can be accommodated by the hardware. The  
number rules available depends on the port type:  
NBX traffic is remarked to DSCP 46 and 802.1d  
priority 6.  
VLAN Configuration  
10/100 Ports - At least 15 rules per port  
10/100/1000 Ports - Maximum of 2 rules per  
port.  
Every port on the unit must be an untagged member  
of a single VLAN. Every port defaults to being an  
untagged member of VLAN1. If you add the port as  
an untagged member of another VLAN then this will  
replace the VLAN1 membership. If the port is an  
untagged member of a VLAN other than 1, then  
removing membership of this VLAN will cause the  
port to return to being an untagged member of  
VLAN1. The unit will respond with the following error  
if you attempt to remove the untagged membership  
of VLAN1:  
You try to bind an ACL to a port which forms part  
of an aggregated link, or a port that has LACP  
enabled.  
The Switch supports ACLs based on IP addresses and  
port ranges rather than VLAN IDs. To set up ACLs to  
restrict routing between VLANs, each VLAN should  
comprise a clearly defined subnet.  
ACLs should not be used on inter-switch links as they  
may interfere with routing messages required for  
normal network operation.  
Failed to delete untagged port 1:2 from VLAN  
1
Management via SNMP / MIBs  
Traffic Prioritization  
There is no CLI command available to remove IP  
Items configured using SNMP/MIB will be lost  
when the unit is power cycled. 3Com recommends  
that the CLI and Web interfaces are used to  
configure the unit instead.  
port based traffic prioritizations. If you wish to  
remove these entries you must either use the Web  
interface or initialize the unit.  
The counters for the etherStatsPkts(64~1518) MIB  
item count traffic which is sent and received by the  
unit. This does not conform to the MIB which  
states that it should count only received packets.  
The IP Port traffic prioritization only examines the  
destination port number field of TCP and UDP  
frames when determining the priority of the  
packet. This may result in the request and response  
frames being prioritized differently as they traverse  
the network.  
Small variations in the sampling of traffic statistics  
may cause the unit to incorrectly measure the  
traffic rates used for RMON alarms. To minimize  
the generation of incorrect alarms 3Com  
The Switch prioritizes traffic internally but does not  
mark or remark packets other than NBX packets.  
recommends that they are configured with a  
 
Points to Note when using the Switch 3226 and Switch 3250  
11  
minimum sampling period of 10 seconds and a  
minimum hysteresis of 20%.  
The presence of both a secure (HTTPS) and  
insecure (HTTP) Web interface on a single unit  
causes some browsers to incorrectly report the  
following warning message:  
SSH Management  
This page contains both secure and insecure  
items. Do you wish to proceed?  
The SSH server in the unit will reject all connection  
requests unless the unit has a SSH host key. This  
host key may be generated using the Security >  
Device > SSH > Server Auth > Key Gen command  
on the Web interface. You may wish to keep a  
record of the host key to allow you to confirm the  
identity of the switch when connecting remotely  
using SSH.  
This warning message may be safely ignored. All  
traffic to and from the unit using the HTTPS  
interface is encrypted. Alternatively you may try  
clearing the Web cache or upgrading your browser  
to the latest version.  
Saving Configuration  
If the unit reboots while using SSH you may have  
to manually restart your SSH client to reconnect  
once the unit has restarted.  
When making configuration changes to the  
Switch, do not reboot or turn off the unit for at  
least 10 seconds after the last configuration  
change. If the unit is rebooted or switched off  
before the 10 seconds is complete the  
HTTPS Management  
The secure Web server on the unit is supplied with  
a default certificate which will fail the browsers  
security checks and an error message like the  
following will be generated:  
configuration changes may be lost.  
Device Backup and Restore  
When the unit backs up the configuration file a  
number of security sensitive settings such as the  
user accounts, RADIUS shared secret and  
The name on the security certificate is  
invalid or does not match the name of the  
site.  
community strings are not backed up. The  
It is not possible for 3Com to ship a certificate with  
the unit that will satisfy these security checks. The  
browser will normally allow you to accept the  
connection regardless. All of the data which is sent  
between the browser and the unit will be securely  
encrypted. You may upload your own valid  
certificate to the switch if you want to avoid these  
warnings. The software to generate these  
certificates is beyond the scope of this document.  
comments in the configuration file indicate that  
these commands may be manually appended to  
the end of the file. Contrary to these instructions,  
3Com recommends that you restore the un-edited  
configuration file and manually reconfigure the  
security parameters using the CLI or Web interface.  
In some scenarios backing up the configuration on  
one unit and restoring it on another will cause the  
 
12  
SUPERSTACK® 3 SWITCH 3226 AND SWITCH 3250 SOFTWARE VERSION 1.02 RELEASE NOTES  
default gateway setting to be lost. You should  
always check the IP address and route  
configuration when restoring the configuration on  
another unit.  
disabled the following error messages will be  
generated:  
Failed to set forward-time  
Failed to set hello-time  
When you enable spanning tree, all spanning tree  
settings are reset to their default values. If you  
want to use custom settings for spanning tree, you  
must configure spanning tree after enabling it.  
IGMP  
Disabling IGMP when there are hosts subscribing to  
multicast IP streams may prevent clients from  
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.  
Roving Analysis Port  
When the roving analysis port feature is activated  
the analyzer should see a copy of all packets sent  
and received by the mirror port. The switch does  
not currently mirror frames sent by the  
Spanning Tree  
When connecting switches together, 3Com  
management CPU of the switch itself. The analyzer  
port will therefore be unable to show  
management traffic from the unit or protocol  
control packets such as RIP which are being sent  
out of the mirror port.  
recommends that spanning tree fast start should  
be disabled on the interconnecting ports (it is  
enabled by default on all 10/100 ports and  
disabled by default on 10/100/1000 and SFP  
ports). This can be done using the Physical  
Interface > Ethernet > Setup command on the  
Web interface.  
While the analyzer port is active it still operates as  
a normal network port, allowing traffic to be  
switched to and from other network ports. You  
must be careful to differentiate traffic seen by the  
analyzer which is from the mirror port and other  
network traffic which may be being sent through  
the analyzer port.  
When connecting switches together, if spanning  
tree fast start is not disabled on the  
interconnecting ports, any previously learned  
addresses on links that become blocked will not  
correctly age out until the aging time has passed. If  
the switch is power cycled then the device will  
learn the addresses correctly.  
The traffic sent out of the analyzer port follows the  
VLAN membership setup for the analyzer port and  
not the mirror port. You must manually  
reconfigure the VLAN membership of the analyzer  
port to match the mirror port or you will not see  
the correct tagged / untagged packets on the  
analyzer.  
You must enable spanning tree before making  
changes to spanning tree settings. If you try to  
change spanning tree settings while the protocol is  
 
Points to Note when using the Switch 3226 and Switch 3250  
13  
compatibility with other 3Com devices but is ignored  
by this device.  
Combination Ports  
The two 10/100/1000 ports are combination ports.  
When an SFP module is inserted it has priority over  
the 10/100/1000 port of the same number. The  
corresponding 10/100/1000 port is disabled. The  
combination ports are numbered 25-26 on the  
Switch 3226 and 49-50 on the Switch 3250.  
When connected to a device that will not  
autonegotiate the device follows the algorithm  
required by the autonegotiation standard which  
states that ports must detect the link speed and then  
operate in half duplex mode.  
Supported SFP Modules  
Auto-MDIX is not available if auto-negotiation is  
disabled on a port. That port will only operate in  
MDIX mode.  
3CSFP91 — SFP 1000BASE–SX  
3CSFP92 — SFP 1000BASE–LX  
3CSFP97 — SFP 1000BASE–LH70  
LACP Protocol  
The LACP protocol is disabled by default. Some  
legacy devices do not support LACP and 3Com  
strongly recommends LACP remains disabled on  
ports connected to these devices (in rare cases, if  
LACP is enabled on ports connected to these  
devices, it can result in incorrect network  
configurations).  
Start-up Time  
The unit will take approximately 2 minutes to  
become fully operational. The unit is fully  
operational when the Self Test LED is lit solid green  
Autonegotiation of Port Speed and Duplex  
All ports on the unit default to using autonegotiation  
to determine the correct speed and duplex setting. If  
the link partner also supports autonegotiation then  
this will result in the optimum link speed and duplex.  
Web Interface  
Many Web browsers can be configured to ignore  
stylesheets, substituting user configured fonts and  
font sizes. Ignoring stylesheets may cause  
unpredictable effects when accessing the Web  
interface. 3Com recommends that you enable  
stylesheets on browsers used to access the Web  
interface of the Switch.  
The speed and duplex of the port may be manually  
set by using the physicalInterface ethernet  
portModecommand to disable autonegotiation and  
select a fixed speed and duplex.  
When autonegotiation is enabled, the unit asks for a  
fallback mode to be entered for use when the port  
connects to a non-autonegotiation device. This  
fallback mode parameter has been left in the CLI for  
 
14  
SUPERSTACK® 3 SWITCH 3226 AND SWITCH 3250 SOFTWARE VERSION 1.02 RELEASE NOTES  
Known Interoperability Issues  
After installation, click LiveUpdate to add support for  
the latest 3Com products.  
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.  
For HP OpenView users the Switch 3226 and Switch  
3250 (and all other 3Com managed products) are  
fully supported by the 3Com Integration Kit for HP  
OpenView (3C15300).  
When using LACP to form a trunk with a  
SuperStack 3 Switch 4400, ensure that the  
Switch 4400 is running the latest software release.  
Older versions of software occasionally fail to  
correctly form the trunk resulting in a network  
loop. Alternatively you could consider configuring  
the trunk manually.  
3Com Network Supervisor  
The CD-ROM contains 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. For larger  
networks (up to 2,500 nodes) and extra functionality  
you can purchase the 3Com Network Supervisor  
Advanced Package.  
Copyright © 2004, 3Com Corporation. All rights reserved.  
Unless otherwise indicated, 3Com registered trademarks are registered in the  
United States and may or may not be registered in other countries.  
3Com, SuperStack, and the 3Com logo are registered trademarks of 3Com  
Corporation.  
Windows is a registered trademark of Microsoft Corporation. Other brand and  
product names may be registered trademarks or trademarks of their respective  
holders.  
To download the latest 3Com Network Supervisor  
and Service Pack please visit:  
 

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