Reference Guide

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.
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 | linecard slot-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 slot/port
5. Set the local port speed.
INTERFACE mode
speed {10 | 100 | 1000 | auto}
6. Optionally, set full- or half-duplex.
INTERFACE mode
duplex {half | 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
NOTE: The show interfaces status command displays link status, but not administrative status. For both
link and administrative status, use the show ip interface [interface | brief | linecard
slot-number] [configuration]
command.
Example of the show interfaces status Command to View Link Status
FTOS#show interfaces status
Port Description Status Speed Duplex Vlan
Gi 0/0 Up 1000 Mbit Auto --
Gi 0/1 Down Auto Auto 1
Gi 0/2 Down Auto Auto 1
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