Configuring Port Speed

Port speed refers to the maximum amount of data that the line card transmits through a port at any given second.

Reference

Command	speed {1000 | 10000 | 25000 | 40000 | 100000}
Description	Configure speed in Mbps
Parameters	1000 1G 10000 10G 25000 25G 40000 40G 100000 100G
Mode	INTERFACE

Example

pbnoscli# configure terminal
pbnoscli(config)# interface ethernet Ethernet4/1
pbnoscli(config-if)# speed 
  1000                  1G
  10000                 10G
  100000                100G
  25000                 25G
  40000                 40G
pbnoscli(config-if)# speed 1000
pbnoscli(config-if)# 

You can verify the configuration by using the command(s) below:

pbnoscli# show interface summary 
============================================================================================================================
Interface       Lanes             Speed   MTU     FEC     Alias           Vlan    Oper    Admin   Type              Asym PFC
============================================================================================================================
Ethernet1/1     0,1,2,3           100G    1500    rs      etp1            trunk   up      up      QSFP28 or later   N/A     
Ethernet2/1     8,9,10,11         100G    9100    none    etp2            trunk   up      up      QSFP28 or later   N/A     
Ethernet3/1     16,17,18,19       100G    9100    none    etp3            trunk   up      up      QSFP28 or later   N/A     
Ethernet4/1     24,25,26,27       1G      9100    fs      etp4            trunk   down    up      N/A               N/A     
Ethernet5/1     32,33,34,35       100G    9100    none    etp5            trunk   down    up      QSFP28 or later   N/A     
Ethernet6/1     40,41,42,43       100G    9100    none    etp6            trunk   down    up      QSFP28 or later   N/A     
Ethernet7/1     48,49,50,51       100G    9100    none    etp7            trunk   down    up      QSFP28 or later   N/A     
Ethernet8/1     56,57,58,59       100G    9100    none    etp8            trunk   down    up      N/A               N/A     
Ethernet9/1     64,65,66,67       100G    9100    none    etp9            trunk   down    up      N/A               N/A     
Ethernet10/1    72,73,74,75       100G    9100    none    etp10           trunk   down    up      N/A               N/A     
Ethernet11/1    80,81,82,83       100G    9100    none    etp11           trunk   down    up      N/A               N/A     
Ethernet12/1    88,89,90,91       100G    9100    none    etp12           trunk   down    up      N/A               N/A     
Ethernet13/1    96,97,98,99       100G    9100    none    etp13           trunk   up      up      QSFP28 or later   N/A     
Ethernet14/1    104,105,106,107   100G    9100    none    etp14           trunk   up      up      QSFP28 or later   N/A     
<...>
Ethernet60/1    472,473,474,475   100G    9100    none    etp60           trunk   down    up      N/A               N/A     
Ethernet61/1    480,481,482,483   100G    9100    none    etp61           trunk   down    up      N/A               N/A     
Ethernet62/1    488,489,490,491   100G    9100    none    etp62           trunk   down    up      N/A               N/A     
Ethernet63/1    496,497,498,499   100G    9100    rs      etp63           routed  up      up      QSFP28 or later   N/A     
Ethernet64/1    504,505,506,507   100G    9100    rs      etp64           routed  up      up      QSFP28 or later   N/A     
pbnoscli#

pbnoscli# show running-config 
configure terminal
!
interface ethernet Ethernet1/1
forward-error-correction rs
!
interface ethernet Ethernet4/1
speed 1000
forward-error-correction fs
!
interface mgmt
ip address 10.4.4.53/23 gateway 10.4.4.1
!
pbnoscli#