Users Guide

Version Description
7.5.1.0 Introduced on the C-Series.
pre-6.2.1.0 Introduced on the E-Series.
Usage
Information
This command is supported on 10/100/1000 Base-T Ethernet interfaces.
You can use the negotiation auto command on the 10G ports on the device.
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.
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.
Example
(Master/Slave)
DellEMC(conf)# interface twentyFiveGigE 1/1
DellEMC(conf-if)# neg auto
DellEMC(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
DellEMC(conf-if-autoneg)# mode ?
forced-master Force port to master mode
forced-slave Force port to slave mode
DellEMC(conf-if-autoneg)#
Example
(Configured)
DellEMC# show interfaces configured
twentyFiveGigE 1/3 is up, line protocol is up
Hardware is DellEMCEth, 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:
...
User Information
Both sides of the link must have auto-negotiation enabled or disabled for the link to come up.
The following details the possible speed and auto-negotiation combinations for a line between two
10/100/1000 Base-T Ethernet interfaces.
Interfaces 695