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Configuring Interfaces
Configuring Ethernet Interfaces
On a 100BASE-FX SFP module, you cannot configure the speed as nonegotiate.
You cannot configure duplex mode on SFP module ports; they operate in full-duplex mode except in these situations:
—
When a Cisco1000BASE-T SFP module is in the SFP module slot, you can configure duplex mode to auto or
full. Half-duplex mode is supported with the auto setting.
—
When a Cisco100BASE-FX SFP module is in the SFP module slot, you can configure duplex mode to half or full
(the default for this SFP module). Although the auto keyword is available, it puts the interface in full-duplex mode
because the 100BASE-FX SFP module does not support autonegotiation.
If both ends of the line support autonegotiation, we highly recommend the default setting of auto negotiation.
If one interface supports autonegotiation and the other end does not, configure duplex and speed on both interfaces;
do not use the auto setting on the supported side.
When STP is enabled and a port is reconfigured, the switch can take up to 30 seconds to check for loops. The port
LED is amber while STP reconfigures.
Caution:
Changing the interface speed and duplex mode configuration might shut down and re-enable the interface
during the reconfiguration.
Setting the Interface Speed and Duplex Parameters
Beginning in privileged EXEC mode, follow these steps to set the speed and duplex mode for a physical interface.
Command
1.
configure terminal
2.
interface interface-id
3.
no shutdown
4.
speed {10 | 100 | 1000 | auto [10 | 100 |
1000] | nonegotiate}
Purpose
Enter global configuration mode.
Specify the physical interface to be configured, and enter interface
configuration mode.
Enable the port, if necessary. By default, UNIs and ENIs are disabled,
and NNIs are enabled.
Enter the appropriate speed parameter for the interface:
Enter 10, 100, or 1000 to set a specific speed for the interface.
The 1000 keyword is available only for 10/100/1000 Mbps ports
or SFP module ports with a 1000BASE-T SFP module.
Enter auto to enable the interface to autonegotiate speed with
the connected device. If you use the 10, 100, or the 1000
keywords with the auto keyword, the port autonegotiates only at
the specified speeds.
The nonegotiate keyword is available only for SFP module ports.
SFP module ports operate only at 1000 Mbps but can be
configured to not negotiate if connected to a device that does not
support autonegotiation.
Note:
When a Cisco1000BASE-T SFP module is in the SFP module
slot, the speed can be configured to 10, 100, 1000, or to auto, but
not to nonegotiate.
35
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