C
HAPTER
27
| Interface Commands
Interface Configuration
– 982 –
COMMAND USAGE
◆ 1000BASE-T does not support forced mode. Auto-negotiation should
always be used to establish a connection over any 1000BASE-T port or
trunk.
◆ When auto-negotiation is enabled the switch will negotiate the best
settings for a link based on the capabilities command. When auto-
negotiation is disabled, you must manually specify the link attributes
with the speed-duplex and flowcontrol commands.
◆ If auto-negotiation is disabled, auto-MDI/MDI-X pin signal configuration
will also be disabled for the RJ-45 ports.
EXAMPLE
The following example configures port 10 to use auto-negotiation.
Console(config)#interface ethernet 1/10
Console(config-if)#negotiation
Console(config-if)#
RELATED COMMANDS
capabilities (977)
speed-duplex (983)
shutdown This command disables an interface. To restart a disabled interface, use
the no form.
SYNTAX
[no] shutdown
DEFAULT SETTING
All interfaces are enabled.
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
COMMAND USAGE
This command allows you to disable a port due to abnormal behavior
(e.g., excessive collisions), and then re-enable it after the problem has
been resolved. You may also want to disable a port for security reasons.
EXAMPLE
The following example disables port 5.
Console(config)#interface ethernet 1/5
Console(config-if)#shutdown
Console(config-if)#
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