negotiation auto
Enable auto-negotiation on an interface.
C-Series, E-Series, S-Series, Z-Series, S4810
Syntax
negotiation auto
To disable auto-negotiation, use the no negotiation auto command.
Defaults Enabled.
Command Modes INTERFACE
Command History
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 8.1.1.0 Introduced on the E-Series ExaScale.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
pre-Version
6.2.1.0
Introduced on the E-Series.
Usage
Information
This command is supported on C-Series, S-Series, and E-Series (TeraScale and ExaScale)
10/100/1000 Base-T Ethernet interfaces.
The no negotiation auto command is only available if you first manually set the speed
of a port to 10Mbits or 100Mbits.
The negotiation auto command provides a mode option for configuring an individual
port to forced-master/forced slave after you enable auto-negotiation.
NOTE: The mode option is not available on non-10/100/1000 Base-T Ethernet line cards.
If you do not use the mode option, the default setting is slave. If you do not configure forced-
master or forced-slave on a port, the port negotiates to either a master or a slave state. Port
status is one of the following:
• Forced-master
• Force-slave
• Master
• Slave
• Auto-neg Error—typically indicates that both ends of the node are configured with
forced-master or forced-slave.
CAUTION: Ensure that one end of your node is configured as forced-master and one is
configured as forced-slave. If both are configured the same (that is, forced-master or
forced-slave), the show interfaces command flaps between an auto-neg-error and
forced-master/slave states.
You can display master/slave settings with the show interfaces command.
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