Rockwell Tools 1783-MS10T User Manual download pdf (Page 73)

Publication 1783-UM002C-EN-P - April 2009 73

Chapter 3

Port and Interface Settings

A cause of port connectivity failure can be a disabled port. Verify that the port

or interface is not disabled or powered down for some reason. If a port or

interface is manually shut down on one side of the link or the other side, the link

does not come up until you re-enable the port. Use the CLI show interfaces

privileged EXEC command to verify the port or interface error-disabled,

disabled, or shutdown status on both sides of the connection. If needed,

re-enable the port or the interface.

Verify Switch Performance

Review this section when troubleshooting switch performance problems.

Speed, Duplex, and Autonegotiation

If the port statistics show a large amount of alignment errors, frame check

sequence (FCS), or late-collisions errors, this might indicate a speed or duplex

mismatch.

A common issue with speed and duplex occurs when the duplex settings are

mismatched between two switches, between a switch and a router, or between

the switch and a workstation or server. This can happen when manually setting

the speed and duplex or from autonegotiation issues between the two devices.

A mismatch occurs under these circumstances:

• A manually set speed or duplex parameter is different from the manually

set speed or duplex parameter on the connected port.

• A port is set to autonegotiate, and the connected port is set to full

duplex with no autonegotiation.

To maximize switch performance and ensure a link, follow one of these

guidelines when changing the settings for duplex and speed:

• Let both ports autonegotiate both speed and duplex.

• Manually set the same speed and duplex parameters for the ports on

both ends of the connection to the same values.

• If a remote device does not autonegotiate, configure the duplex settings

on the two ports to the same values.

The speed parameter can adjust itself even if the connected port does

not autonegotiate.

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Rockwell Tools 1783-MS10T User Manual Page 73