Random useful switch Commands
We would like to post few random switch commands that we used in our day to day life.
To get the switch port of a MAC address, use the following command.
# show mac address-table address xx:xx:xx:xx:xx:xx
Aging time is 300 secVlan Mac Address Port Type
——– ——————— ———- ———-100 xx:xx:xx:xx:xx:xx gi1/0/12 dynamic
To view the MAC address of a switch port, execute the following command.
# show mac address-table interface gi1/0/2
Aging time is 300 secVlan Mac Address Port Type
——– ——————— ———- ———-
100 xx:xx:xx:xx:xx:xx gi1/0/2 dynamic
To view the vlan and administrative mode of a switch port, execute the following command.
#show interfaces switchport gi1/0/12
……..
Administrative Mode: access
Access Mode VLAN: 100
To get the speed of a switch port, use the below command.
# show interfaces status gi1/0/12
Flow Link Back Mdix
Port Type Duplex Speed Neg ctrl State Pressure Mode
——– ———— —— —– ——– —- ———– ——– ——-
gi1/0/12 1G-Copper Full 100 Enabled On Up Disabled Off
To change the VLAN of a switch port, follow the below steps.
#configure
(config)#interface gi1/0/<port number>
(config-if)#switchport access vlan 100
To Trunk a switch port to different vlan, execute the following command.
#configure
(config)#interface gi1/0/<port number>
(config-if)#switchport mode trunk
(config-if)#switchport trunk allowed vlan add <vlan number1> <vlan number2>
(config-if)#end
To shutdown a single port, execute the below commands.
#configure
(config)#interface gi1/0/<port number>
(config-if)# shutdown
To copy the running configuration to startup configuration, execute the mentioned command.
#copy running-config startup-config
To add a new vlan to database, follow the below mentioned steps.
#configure
#vlan database
# vlan <vlan number>
To view all the switch ports belongs to a particular vlan, execute the following command.
show vlan tag <vlan number>
This will list all the switch ports which belongs to a vlan.
To view the recent logs on the switch, execute the following command.
show logging
