Users Guide

For 10/100/1000 Ethernet interfaces, the negotiation auto command is tied to the speed command. Auto-negotiation is
always enabled when the speed command is set to 1000 or auto.
NOTE: In the S3100 series, the negotiation auto and the speed commands are not available on the combo ports in the
hybrid mode. You need to provision the combo port as copper or fiber medium using the combo-port-type command.
Setting the Speed and Duplex Mode of Ethernet Interfaces
To discover whether the remote and local interface requires manual speed synchronization, and to manually synchronize them
if necessary, use the following command sequence.
1 Determine the local interface status. Refer to the following example.
EXEC Privilege mode
show interfaces [interface | stack—unit stack-unit-number] status
2 Determine the remote interface status.
EXEC mode or EXEC Privilege mode
[Use the command on the remote system that is equivalent to the first command.]
3 Access CONFIGURATION mode.
EXEC Privilege mode
config
4 Access the port.
CONFIGURATION mode
interface interface-type
5 Set the local port speed.
INTERFACE mode
speed {10 | 100 | 1000 | 10000 | auto}
NOTE: If you use an active optical cable (AOC), you can convert the QSFP+ port to a 10 Gigabit SFP+ port or 1 Gigabit
SFP port. You can use the speed command to enable the required speed.
6 Optionally, set duplex.
INTERFACE mode
duplex full
7 Disable auto-negotiation on the port.
INTERFACE mode
no negotiation auto
If the speed was set to 1000, do not disable auto-negotiation.
8 Verify configuration changes.
INTERFACE mode
show config
Example of the show interfaces status Command to View Link Status
NOTE: The show interfaces status command displays link status, but not administrative status. For both link and
administrative status, use the show ip interface command.
Dell#show interfaces status
Port Description Status Speed Duplex Vlan
Interfaces 338