Reference Guide

586 | Interfaces
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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 once auto-negotiation is enabled
Figure 23-20. negotiation auto Master/Slave Example
If the mode option is not used, 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.
You can display master/slave settings with the show interfaces command.
Figure 23-21. Display Auto-negotiation Master/Slave Setting (partial)
Both sides of the link must have auto-negotiation enabled or disabled for the link to come up.
Note: The mode option is not available on non-10/100/1000 Base-T Ethernet line cards.
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 will flap between an auto-neg-error and
forced-master/slave states.
FTOS(conf)# int gi 0/0
FTOS(conf-if)#neg auto
FTOS(conf-if-autoneg)# ?
end Exit from configuration mode
exit Exit from autoneg configuration mode
mode Specify autoneg mode
no Negate a command or set its defaults
show Show autoneg configuration information
FTOS(conf-if-autoneg)#mode ?
forced-master Force port to master mode
forced-slave Force port to slave mode
FTOS(conf-if-autoneg)#
FTOS#show interfaces configured
GigabitEthernet 13/18 is up, line protocol is up
Hardware is Force10Eth, address is 00:01:e8:05:f7:fc
Current address is 00:01:e8:05:f7:fc
Interface index is 474791997
Internet address is 1.1.1.1/24
MTU 1554 bytes, IP MTU 1500 bytes
LineSpeed 1000 Mbit, Mode full duplex, Master
ARP type: ARPA, ARP Timeout 04:00:00
Last clearing of "show interfaces" counters 00:12:42
Queueing strategy: fifo
Input Statistics:
...