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ManualsBrandsDell ManualsAccess PlatformsNetworking S3100 Series
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Auto-Negotiation on Ethernet
Interfaces
By default, auto-negotiation of speed and duplex mode is enabled on 10/100/1000 Base-T Ethernet
interfaces. Only 10GE interfaces do not support auto-negotiation.
When using 10GE interfaces, verify that the settings on the connecting devices are set to no auto-negotiation.
NOTE: When you use a copper SFP2 module with catalog number GP-SFP2-1T in the S25P model, you
can manually set its speed with the speed command. When the speed is set to 10Mbps or 100Mbps, you
can use the duplex command.
The local interface and the directly connected remote interface must have the same setting, and auto-
negotiation is the easiest way to accomplish that, as long as the remote interface is capable of auto-
negotiation.
NOTE: As a best practice, Dell Networking recommends keeping auto-negotiation enabled. Only disable
auto-negotiation on switch ports that attach to devices not capable of supporting negotiation or where
connectivity issues arise from interoperability issues.
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.
Interfaces 408