The Cisco Switching Small Business / SG main commands

Last updated: Feb 25, 2025

Configuration

Switch model: Cisco SG550X
Switch model: Cisco SG350X
Switch model: Cisco CBS250
Switch model: Cisco Catalyst 1300

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) information:

Cisco# show inventory

Show last logs:

Cisco# show logging

Show learned ip addresses:

Cisco# show arp

User Account Management

Change password:

Cisco(config)# username cisco password myNEWpassword

Add admin user:

Cisco(config)# username cisco privilege 15 password myNEWpassword

Disable password maximum lifetime:

Switch(config)# password aging 0

Misc

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

Disable DNS lookup feature for unknown commands:

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 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

Erase configuration, do a factory reset:

Switch(config)# delete startup-config

Disable the logging of system messages and events to the console interface:

Switch(config)# no logging console

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

LACP

Switch01

Configure LACP on interfaces gi1/0/1 and gi1/0/2:

Switch01(config)# interface range gi1/0/1-2
Switch01(config-if-range)# channel-group 1 mode auto

Configure Link Aggregation, the Po 1 virtual interface, like any other interface:

Switch01(config)# interface Port-Channel 1
Switch01(config-if)# switchport mode trunk
Switch01(config-if)# switchport trunk allowed vlan all

Switch02

Configure LACP on interfaces gi1/0/1 and gi1/0/2:

Switch02(config)# interface range gi1/0/1-2
Switch02(config-if-range)# channel-group 1 mode auto

Configure Link Aggregation, the Po 1 virtual interface, like any other interface:

Switch02(config)# interface Port-Channel 1
Switch02(config-if)# switchport mode trunk
Switch02(config-if)# switchport trunk allowed vlan all

Show

Switch01# show lacp port-channel 1 Switch01# show lacp gi1/0/1

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 vlan 4

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

Configure Stack

Stack two SG switches

Note: When stacking two SG switches, it's essential to ensure that both the models and firmware are the same.

Cisco stack configuration: two switches connected via TenGigabitEthernet ports te1/0/1 and te1/0/2.

Switch01

Enter the context of Stack Unit 1:

Switch01(config)# stack unit 1

Set the Unit ID to 1 (Master):

Switch01(unit)# stack configuration links te1-2 unit-id 1

Save the configuration:

Switch01(unit)# do write

Restart:

Switch01(unit)# do reload

Switch02

Enter the context of Stack Unit 1:

Switch02(config)# stack unit 1

Set the Unit ID to 2:

Switch02(unit)# stack configuration links te1-2 unit-id 2

Save the configuration:

Switch02(unit)# do write

Restart:

Switch02(unit)# do reload

Show commands

Display the stack configuration:

Stack# show stack configuration

Unit Id  After Reboot Configuration
         Unit Id   Stack Links   
-------- ------- --------------- 
1        1       te1-2           
2        2       te1-2

Display the stack settings:

Stack# show stack

Topology is Chain
Units stack mode: Native

Unit Id     MAC Address        Role    Network Uplink 
                                       Port    Port   
                                       Type    Type   
------- ------------------- ---------- ------- ------ 
   1     40:a6:e8:e6:9c:11    active     gi      te   
   2     40:a6:e8:e6:9c:12   standby     gi      te

Display the stack information for an entire stack:

Stack# show stack links details

Topology is Chain

UNIT ID   Link     Status   Speed Neighbor Neighbor     Neighbor
                                  Unit ID  Link         MAC Address
------- -------- ---------- ----- -------- -------- -------------------
   1      te1      Active    10G     2       te2     40:a6:e8:e6:9c:12
   1      te2      Active    10G     2       te1     40:a6:e8:e6:9c:12
   2      te1      Active    10G     1       te2     40:a6:e8:e6:9c:11
   2      te2      Active    10G     1       te1     40:a6:e8:e6:9c:11

Remove stack configuration

Remove the stack configuration settings:

Switch01(config)# stack unit 1 Switch01(unit)# no stack configuration

Computing

Music

Misc

The Cisco Switching Small Business / SG main commands

Configuration

Commands

Show

User Account Management

Misc

Import/Export Config

Update Firmware

Easy method

Normal method

LACP

Switch01

Switch02

Show

PoE

VLAN

Locked Port / Disable port security

sFlow

Port Mirroring / SPAN

NTP

Spanning Tree

Configure Stack

Stack two SG switches

Switch01

Switch02

Show commands

Remove stack configuration