Users Guide

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.
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 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.
Dell#show interfaces status
Port Description Status Speed Duplex Vlan
Gi 1/1 Down 1000 Mbit Auto 1
Gi 1/2 Down Auto Auto 1
Gi 1/3 Down Auto Auto --
Gi 1/4 Force10Port Up 1000 Mbit Auto 30-130
Gi 1/5 Down Auto Auto --
Gi 1/6 Down Auto Auto --
Gi 1/7 Up 1000 Mbit Auto 1502,1504,1506-1508,1602
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Interfaces