====== CLI ======

===== passwords =====

<code>
conf term
enable secret 0 <pass>
! for telnet:
line vty 0 4
login
password <pass>
end
wr
copy run start
</code>


===== STARTUP_CONFIG_IGNORED =====

<code>
%SYS-6-STARTUP_CONFIG_IGNORED: System startup configuration is ignored based on the configuration register setting.
</code>

<code>
sh version
...
Configuration register is 0x141
</code>

[[https://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/50421-config-register-use.html]]

<code>
enable
dir
conf term
boot system flash bootflash:cat4500-ipbasek9-mz.122-54.SG1.bin
exit
wr
copy run star

config-register 0x102

reload
</code>


===== Console baud rate =====
It is possible to switch console baud rate after boot. It will be applied after system will bootup and executes startup-config.

<code bash>
configure terminal
line con 0
speed 9600
! note: now you need to reconfigure your terminal client to different baud rate
end
wr
copy run star
</code>


===== LLDP =====
<code>
enable
config terminal
lldp run
exit
copy run start

show lldp neighbors
</code>
===== PoE =====
  * ''show power inline''

===== Enable SNMP =====

<code cli>
enable
configure terminal
snmp-server community public ro
snmp-server contact <itadmin@grinn-global.com>
snmp-server location GRINN - Serwerownia
exit
copy run start
</code>

===== VLAN =====

<code>
enable
show vlan
configure terminal

! delete vlan 7
no vlan 7

! add tagged vlan 28
vlan 28
name admin
end

show vlan

configure terminal
interface range Gi0/1-28
switchport trunk encapsulation dot1q
switchport trunk native vlan 1
switchport trunk allowed vlan add 28,255
no shut
end
</code>

<code>
configure terminal
interface range Gi0/1-28
! to remove all ports from VLAN:
no switchport access vlan
end
</code>

==== VLAN IP address ====

<code>
enable
configure terminal
interface vlan 1
no ip address DHCP
no ip address
end

int vlan 28
ip address 192.168.28.31 255.255.252.0
no shutdown
exit

ip default-gateway 192.168.28.1
ip name-server 192.168.28.1
ntp server 192.168.28.1
end

show ip redirects
show spanning-tree vlan 28
sh int vlan 28

copy running-config startup-config
</code>

<code>
wr
copy running-config startup-config
</code>

==== put one port in VLAN ====

<code>
conf term
interface Gi1/48
switchport access vlan 28
end
wr
</code>


===== reload =====

<code>reload</code>

===== RSTP =====

<code>
show spanning-tree summary
enable
config
spanning-tree mode ?
spanning-tree mode rapid-pvst

spanning-tree vlan 1 priority 57344
spanning-tree vlan 2 priority 57344
spanning-tree vlan 28 priority 57344
spanning-tree vlan 255 priority 57344
exit

show spanning-tree bridge

wr
copy run star

</code>

Disable STP:
<code>
enable
config terminal
Switch(config)#no spanning-tree vlan 1
wr
copy run star
</code>


===== Find MAC on ports =====

<code>
sh mac address-table vlan 1
</code>

<code>
show interface Gi0/40
show controllers
</code>


===== show port counters =====

<code cli>
show interface counters

enable
clear counters
</code>

===== diagnose port =====

<code cli>show interface Gi0/17</code>

Using Time Domain Reflectometer

<code cli>
enable
test cable-diagnostics tdr int Gi0/17
show cable-diagnostics tdr int Gi0/17
</code>