Command Line Reference Guide

564 | Interfaces
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FTOS(conf-if-autoneg)#
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.
Example 2
(Display
Auto-negotiation)
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:
...
Both sides of the link must have auto-negotiation enabled or disabled for the link to come up.
The following table details the possible speed and auto-negotiation combinations for a line between
two 10/100/1000 Base-T Ethernet interfaces.
Related
Commands
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.
Table 25-44. Auto-negotiation and Link Speed Combinations
Port 0 Port 1
Link Status between
Port 1 and Port 2
auto-negotiation enabled* speed
1000 or auto
auto-negotiation enabled* speed
1000 or auto
Up at 1000 Mb/s
auto-negotiation enabled speed 100 auto-negotiation enabled speed 100 Up at 100 Mb/s
auto-negotiation disabled speed 100 auto-negotiation disabled speed 100 Up at 100 Mb/s
auto-negotiation disabled speed 100 auto-negotiation enabled speed 100 Down
auto-negotiation enabled* speed
1000 or auto
auto-negotiation disabled speed 100 Down
* You cannot disable auto-negotiation when the speed is set to 1000 or auto.
speed (for 10/100/1000 interfaces) Set the link speed to 10, 100, 1000 or auto-negotiate the speed.