Basic Commands
enable
conf t
exit
end
hostname SW100
copy running-config startup-config
Favorite Commands
wr
logging synchronous
no ip domain lookup
no enable password
show ip int brief
show vlan brief
L2 (show ip route) or L3 (show run | i ip route)
show vlan
IOS12 (show running-conf) or IOS15 (show running-config all)
show startup-conf
sh run | include def
show version
show clock detail
show ip ssh
show crypto key mypubkey rsa
Set ssh to version 2
show ip ssh
conf t
ip ssh version 2
exit
show ip ssh
Configure NTP Time Server
show ntp status
conf t
ntp server 172.16.200.14
exit
show ntp status
To remove: no ntp server 172.16.200.14
conf t
clock timezone PST -8
exit
show clock
Switch# clock set 08:45:00 08 December 2021
conf t
clock summer-time PDT recurring 2 Sun Mar 2:00 1 Sun Nov 2:00
exit
show clock
Generate RSA Key
ip domain-name iotnetwork.local
crypto key generate rsa
4096
RELOAD?
Add User
username web password my_password
Operating Mode
Layer 2 or switching mode (switchport command).
If the physical port is in Layer 2 mode (the default), you must enter the no switchport interface configuration command to put the interface into Layer 3 mode.
conf t
interface FastEthernet 1/2
no switchport
ip address 172.16.120.50 255.255.255.0
no shutdown
end
no ip domain lookup
traceroute 172.16.100.245
Escape Sequence (control+shift+6) and hold
(For Layer 2 Switch) show ip route
(For Layer 2 Switch) ip default-gateway 172.16.101.1
(For Layer 3 Switch) show run | i ip route
(For Layer 3 Switch) ip route 0.0.0.0 0.0.0.0 172.16.101.1
show int FastEthernet 1/2 switchport
Create Vlans
show vlan brief
conf t
vlan 20
vlan 30
show vlan brief
end
conf t
interface FastEthernet 1/2
switchport access vlan 20
end
show int FastEthernet 1/2 switchport
conf t
int vlan 20
ip address 172.16.20.1 255.255.255.0
Reload Switch
write erase
reload
delete flash:vlan.dat
reload
Trunks
show interface trunk
conf t
show run interface GigabitEthernet 1/1
interface GigabitEthernet 1/1
switchport mode trunk
exit
show interface trunk
Set IP
show int vlan 1
int vlan 1
ip address 171.16.100.100 255.255.255.0
show int vlan 1