Dell SmartFabric OS10 User Guide Release 10.5.4

Configuration notes

• All Dell PowerSwitches:
  • Platforms (Z9100, Z9264F, Z9332F-ON, Z9432F-ON, S5200 Series, S5448F-ON, S4100 Series, and S4200 Series with 25G (SFP28), 100G (SFP56DD, QSFP28), 200G (QSFP28DD), and 400G (QSFP56DD) 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
    Current address is e4:f0:04:3e:2d:86
Pluggable media present, QSFP28 type is QSFP28 100GBASE-CR4-2.0M
    Wavelength is 64
    Receive power reading is not available

Interface index is 112
Internet address is not set
Mode of IPv4 Address Assignment: not set
Interface IPv6 oper status: Disabled
MTU 1532 bytes, IP MTU 1500 bytes
LineSpeed 100G, Auto-Negotiation on