Administrator Guide

Setting the Speed 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 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 command.
DellEMC#show interfaces status
Port Description Status Speed Duplex Vlan
Te 1/1 Down 1000 Mbit Auto 1
Te 1/2 Down Auto Auto 1
Te 1/3 Down Auto Auto --
Te 1/4 Force10Port Up 1000 Mbit Auto 30-130
Te 1/5 Down Auto Auto --
Te 1/6 Down Auto Auto --
Te 1/7 Up 1000 Mbit Auto 1502,1504,1506-1508,1602
Te 1/8 Down Auto Auto --
Te 1/9 Down Auto Auto --
Te 1/10 Down Auto Auto --
Te 1/11 Down Auto Auto --
Te 1/12 Down Auto Auto --
[output omitted]
In the previous example, several ports display “Auto” in the Speed field. In the following example, the speed of port 1/1 is set to
100Mb and then its auto-negotiation is disabled.
DellEMC#configure
DellEMC(config)#interface tengig 1/1
406
Interfaces