Version 6 SuperStack 3 Switch 4400 Management Interface Reference Guide

Support - Problem Solving - Other Problems
http://support.3com.com/infodeli/tools/switches/4400/DHA1720-3AAA08/htm/support/problemsolving/otherproblems.htm[11/15/2010 3:44:17 PM]
Support
Problem Solving
Other Problems
You have added the Switch to an already busy network, and
response times and traffic levels have increased.
You may have added a group of users to one of the Switch ports via a
hub, and not disabled half duplex flow control for the port. Disable half
duplex flow control for all ports that are operating in half duplex and
are connected to multiple devices using a hub.
You have enabled auto-negotiation for a 10BASE-T/100BASE-TX
port, and you are seeing a large number of late events on the
port.
The port connected to the Switch is not auto-negotiating and is
operating in full duplex:
If you want the link to operate in full duplex, set the port on the
Switch to operate in full duplex.
If you want the link to operate in half duplex, set the port on the
other end of the link to operate in half duplex. For more
information, see the documentation supplied with the remote
device.
You cannot configure a port for 10Mbps.
Disable auto-negotiation for the port and then set the port speed and
duplex mode.
Via the CLI:
1. To disable auto-negotiation for the port, refer to the instructions
for
Enabling and Disabling Auto-negotiation.
2. To specify the speed and duplex mode of the port, refer to the
instructions for
Specifying the Speed and Duplex Mode.
Via the web interface:
To disable auto-negotiation for the port and specify the speed and
duplex mode of the port, refer to the instructions for
Enabling and
Disabling Auto-Negotiation.
Slow performance after installing your Switch with an existing
Network adapter.
Auto-negotiation only works if both sides of the link are set to
negotiate. If an auto-negotiating port is attached to a non auto-
negotiating port, the auto-negotiating port will configure itself to half
duplex. This is to prevent connecting to products that only operate in
half duplex. The default configuration for the Switch ports is auto-
negotiation.
Set the Switch port(s) to 100Mbps, full duplex to match the Network
adapter configuration.
Disable auto-negotiation for the port and then set the port speed and
duplex mode.