Cisco command references for Cisco 2960, 3550, 3750, 4506

Enter the enable command to access privileged EXEC mode:

Switch> enable

Switch#

Switch# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Enable Telnet

Switch(config-if)#Line vty 5 15

Switch(config-if)#password yourpassword

Switch(config-if)#transport input telnet

Switch(config-if)#login

Add SNMP

Switch(config-if)#snmp-server community public RO

add NTP

Switch(config-if)#ntp peer IP-address

add name server

Switch(config-if)#ip name-server IP-address

Switch(config-if)#ip domain-name domain name

Create new VLAN

Switch(config-if)#vlan vlan-id

Switch(config-if)#name vlan-name

Switch(config-if)#interface vlan vlan-id

Switch(config-if)#description vlan-name

Adding IP helper

Switch(config-if)#interface vlan vlan-id

Switch(config-if)#ip helper-address IP-address

Adding sppaning-tree

Switch(config-if)#interface eth0/port-number

Switch(config-if)#spanning-tree portfast

delete VLAN

Switch#VLAN database

Switch(config-if)#no vlan vlan-id

Access List

This example shows how to configure an extended IP ACL that allows only TCP traffic to the destination IP address 128.88.1.2 with a TCP port number of 25 and how to apply it to an interface: 

 Switch(config)#access-list 102 permit tcp any host 128.88.1.2 eq 25 

 

 

Switch(config)#interface fastethernet0/8

 

 

Switch(config-if)#ip access-group 102 in 

 

 

 

This is an example of an extended ACL that allows TCP traffic only from two specified networks. The wildcard bits apply to the host portions of the network addresses. Any host with a source address that does not match the ACL statements is denied.

 

 

access-list 104 permit tcp 192.5.0.0 0.0.255.255 any

access-list 104 permit tcp 128.88.0.0 0.0.255.255 any
Switch(config-if)#access-list 101 deny   ip 10.143.12.0 0.0.3.255 10.143.8.30 0.0.0.1
Switch(Config-if)#access-list 101 permit ip any any
IP Routing
ip default-gateway x.x.x.1
ip route 0.0.0.0 0.0.0.0 x.x.x.1
ip route x.x.x.x 255.255.255.255  x.x.x.1
ip route x.x.x.0 255.255.248.0 VlanX
ip route x.x.x.0 255.255.255.128 VlanX
VLAN IP setup
 interface VlanX
 description Server VLAN
 ip address x.x.x.1 255.255.255.128
ip helper-address x.x.x.x
view config
Switch#show vlan brief
Switch#show vlan
Switch#show running-config
Switch#show startup-config
write config permanently
switch#wr
How to Backup Startup-Configuration?
COPY/ERASE/BACKUP NVRAM @your own risk
=====================================
switch#copy startup-config tftp:
Address or name of remote host []? 192.168.100.1
Destination filename [dhaka-confg]?
!!
1558 bytes copied in 0.248 secs
switch#
How to Backup IOS?
====================================
switch#copy flash: tftp:
Source filename []? flash:c2500-jk8os-l.122-1d.bin
Address or name of remote host []? 192.168.100.1
Destination filename [c2500-jk8os-l.122-1d.bin]?
How to Restore Startup-Configuration?
=========================================
switch#copy tftp: startup-config
Address or name of remote host []? 192.168.100.1
Source filename []? switch-confg
Destination filename [startup-config]?
How to Erase the NVRAM?
==============================
switch#write erase
Erasing the nvram filesystem will remove all files! Continue? [confirm]
[OK]
Erase of nvram: complete
switch#
switch#reload
Proceed with reload? [confirm]