Service Manual

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 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.
Example
(Master/Slave)
Dell(conf)# interface tengigabitethernet 1/1
Dell(conf-if)#neg auto
Dell(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
Dell(conf-if-autoneg)#mode ?
forced-master Force port to master mode
forced-slave Force port to slave mode
Dell(conf-if-autoneg)#
Example
(Configured)
Dell#show interfaces configured
TenGigabitEthernet 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:
...
User Information
Both sides of the link must have auto-negotiation enabled or disabled for the link to come up.
Interfaces 643