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The Cisco Switching Small Business / SG main commands

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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
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