The Cisco Switching Small Business / SG main commands

Last updated: Feb 04, 2022

Configuration

Switch model : Cisco SG550X
Switch model : Cisco SG350X
Switch model : Cisco CBS250

Commands

Show

Get firmware version :

Cisco# show version

Get serial number :

Cisco# show system id

Get model, uptime, hostname, MAC Address :

Cisco# show system unit 1

Get mac address :

Cisco# show mac address-table

Get gbic (sfp module) informations :

Cisco# show inventory

Show last logs :

Cisco# show logging

Show learned ip addresses :

Cisco# show arp

Misc

Change password :

Cisco (config)# username cisco password myNEWpassword

Add admin user :

Cisco (config)# username cisco privilege 15 password myNEWpassword

Change hostname :

Cisco (config)# hostname Switch

Save current config :

Switch# copy running-config startup-config Switch# write

Set switch ip :

Switch (config)# interface vlan1
Switch (config-if)# ip address 192.168.1.100 255.255.255.0
Switch (config-if)# no ip address dhcp

Set dns :

Switch (config)# ip name-server 192.168.1.110
Switch (config)# no ip domain lookup

Add ip gateway :

Switch (config)# interface vlan1
Switch (config-if)# ip default-gateway 192.168.1.254

Reboot :

Switch # reload

Interface range (use gi1, gi2 etc… for CBS series) :

Switch (config)# interface range ge1/0/4,ge1/0/30 Switch (config)# interface range ge1/0/4-18

Enable ssh server :

Switch (config)# ip ssh server

Disable http server

Switch (config)# no ip http server

Disable password maximum lifetime :

Switch (config)# password aging 0

Disable Bonjour :

Switch (config)# no bonjour enable

Disable PNP :

Switch (config)# no pnp enable

Check cpu utilization :

Switch# show cpu utilization

Globally disable the M#@!€*£cking auto smartport (port autoconfiguration) for CBS series :

Switch (config)# no macro auto

Import/Export Config

Upload config to tftp server

Switch # copy run tftp://tftp_server/YYYY-MM-DD

Import config from tftp server

Switch # copy tftp://tftp_server/YYYY-MM-DD run

Update Firmware

Easy method

Upload new firmware :

Switch # boot system tftp://tftp_server/firmware.bin

Reboot to load new firmware :

Switch # reload

Normal method

Upload new firmware

Switch # copy tftp://tftp_server/firmware.bin flash://system/images/

Get available firmwares

Switch # show bootvar

Enable new firmware

Switch # boot system image-2

Reboot

Switch # reload

PoE

Turn off PoE

Switch (config)# interface gi1/0/1
Switch (config-if)# no power inline

Turn on PoE

Switch (config)# interface gi1/0/1
Switch (config-if)# power inline auto

Get PoE informations

Switch # show power inline
Switch # show power inline gi1/0/1

VLAN

Add a VLAN :

Switch (config)# vlan database
Switch (config-vlan)# vlan 4
Switch (config)# interface vlan 4
Switch (config-if)# name VoIP

Set the access VLAN to an interface :

Switch (config)# interface GigabitEthernet 1/24
Switch (config-if)# switchport mode access
Switch (config-if)# switchport access vlan4

Configure the allowed VLAN to a Trunk interface :

Switch (config)# interface te 1/0/1
Switch (config-if)# switchport mode trunk
Switch (config-if)# switchport trunk allowed vlan none
Switch (config-if)# switchport trunk allowed vlan add 4,100,101,150

Locked Port / Disable port security

Message : Your port has port security enable and has noticed that the MAC address on that port is different from what the port had originally learned.

Switch # set interface active gi2/0/4
Switch # show ports security gi2/0/4
Switch (config) # interface gi2/0/4
Switch (config-if)# no port security

sFlow

Set sFlow :

Switch (config)# sflow receiver <index of the receiver> <sflow receiver ip> port 2055
Switch (config)# interface range GigabitEthernet1/0/1-48
Switch (config-if-range)# sflow flow-sampling 1024 1
Switch (config-if-range)# sflow counters-sampling 600 1

Disable sFlow :

Switch (config)# interface TengigabitEthernet1/0/1
Switch (config-if)# no sflow counters-sampling
Switch (config-if)# no sflow flow-sampling

Port Mirroring / SPAN

Set mirroring on GigabitEthernet1/0/1

Switch (config)# monitor session 1 destination interface GigabitEthernet1/0/1

With GigabitEthernet1/0/2 and GigabitEthernet1/0/3 traffic :

Switch (config)# monitor session 1 source interface GigabitEthernet1/0/2 both
Switch (config)# monitor session 1 source interface GigabitEthernet1/0/3 both

NTP

Show current time :

Switch# show clock

Show ntp status :

Switch# show sntp status

Set ntp (you should configure network access first) :

Switch (config)# clock source sntp
Switch (config)# sntp unicast client enable
Switch (config)# sntp server 0.pool.ntp.org

Spanning Tree

Show spanning tree configuration :

Switch# show spanning-tree

Set current switch as root bridge :

Switch (config)# spanning-tree priority 4096

Use RTSP (Rapid Spanning Tree Protocol) mode :

Switch (config)# spanning-tree mode rstp

Computing

Music

Misc

The Cisco Switching Small Business / SG main commands

Configuration

Commands

Show

Misc

Import/Export Config

Update Firmware

Easy method

Normal method

PoE

VLAN

Locked Port / Disable port security

sFlow

Port Mirroring / SPAN

NTP

Spanning Tree