Users Guide

○ Platforms (Z9100, Z9264F, S5200 Series, Z9332F-ON, S4100 Series, MX series and S4200 Series) with 100G(QSFP28
and QSFP28DD) ports do not support 1G auto negotiation.
○ For 10G and 1G BASE-T ports, you cannot disable auto negotiation for copper Gigabit Ethernet interfaces.
○ If you modify flow control settings on an auto negotiation-enabled port, the port flaps for the changes to take effect.
○ If a DAC (25G, 40G, 50G, 100G, 200G, or 400G) is connected to a switch, auto negotiation is enabled by default.
● Z9332F-ON platform: OS10 supports 25G auto negotiation with third-party 25G NIC devices that comply with the IEEE
802.3by and 25G Ethernet Consortium standards. When you use a third-party NIC device that does not support the 25G
Ethernet Consortium standard, to bring up the port:
○ If you have enabled SmartAN technology on the server, disable auto negotiation on the OS10 switch port.
○ Otherwise, disable auto negotiation on both the OS10 switch port and the third-party link partner.
To force negotiation, use the following command:
negotiation on
To disable negotiation, use the following command:
negotiation off
To reset the negotiation mode to the default setting of the media you use, use one of the following commands:
negotiation auto
no negotiation
The following examples show that the nondefault configuration is added to the running configuration:
OS10(conf-if-eth1/1/50)# negotiation off
OS10(conf-if-eth1/1/50)# show configuration
!
interface ethernet1/1/50
no shutdown
switchport access vlan 1
negotiation off
flowcontrol receive on
OS10(conf-if-eth1/1/50)# negotiation on
OS10(conf-if-eth1/1/50)# show configuration
!
interface ethernet1/1/50
no shutdown
switchport access vlan 1
negotiation on
flowcontrol receive on
The following examples show that the default configuration is not added to the running configuration:
OS10(conf-if-eth1/1/50)# negotiation auto
OS10(conf-if-eth1/1/50)# show configuration
!
interface ethernet1/1/50
no shutdown
switchport access vlan 1
flowcontrol receive on
The following example shows that the no negotiation command resets the interface to the default setting of the media
used.
OS10(conf-if-eth1/1/50)# no negotiation
OS10(conf-if-eth1/1/50)# show configuration
!
interface ethernet1/1/50
no shutdown
switchport access vlan 1
flowcontrol receive on
OS10(conf-if-eth1/1/50)# do show interface ethernet 1/1/50
Ethernet 1/1/50 is up, line protocol is up
Hardware is Eth, address is e4:f0:04:3e:2d:86
Interfaces
361