Administrator Guide

Version Description
8.3.7.0 Introduced on the S4810.
8.1.1.0 Introduced on the E-Series.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
pre-6.2.1.0 Introduced on the E-Series.
Usage Information
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 systems.
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.
You can use the negotiation auto command to turn autonegotiation on or off only on fiber interfaces
operating at 1G speed.
If you use a 1 G SFP, disable autonegotiation on both peer ends. If you do not disable autonegotiation, the link
does not come up.
Example (Master/
Slave)
DellEMC(conf)# interface tengigabitethernet 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
TenGigabitEthernet 1/18 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
690 Interfaces