Auto-Negotiation On Ethernet Interfaces - Dell Force10 C150 Configuration Manual

Auto-Negotiation on Ethernet Interfaces

Setting speed and duplex mode of 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: Starting with FTOS 7.8.1.0, when a copper SFP2 module with catalog number GP-SFP2-1T is used
in the S25P model of the S-Series, its speed can be manually set with the speed command. When the
speed is set to 10 or 100 Mbps, the duplex command can also be executed.
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 Force10 recommends keeping auto-negotiation enabled. Auto-negotiation
should only be disabled 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
Auto-negotiation is always enabled when the
To discover whether the remote and local interface require manual speed synchronization, and to manually
synchronize them if necessary, use the following command sequence (see
Step Task
1 Determine the local interface status. See
Figure 20-34.
2 Determine the remote interface status.
3 Access CONFIGURATION mode.
4 Access the port.
5 Set the local port speed.
6 Optionally, set full- or half-duplex.
7 Disable auto-negotiation on the port. If the
speed was set to 1000, auto-negotiation
does not need to be disabled.
8 Verify configuration changes.
negotiation auto
command is tied to the
speed
command is set to
Command Syntax
show interfaces [
interface
] status
slot-number
[Use the command on the remote system
that is equivalent to the above command.]
config
interface
interface slot
speed { 10 | 100 | 1000 | auto }
duplex { half | full }
no negotiation auto
show config
speed
1000 auto
or .
Figure 20-35 on page
Command Mode
| linecard
EXEC Privilege
EXEC
EXEC Privilege
EXEC Privilege
/ CONFIGURATION
port
INTERFACE
INTERFACE
INTERFACE
INTERFACE
command.
456):
Interfaces | 455