Cisco 2960 configuration notes

Easiest way to connect is to use the console port and minicom. Configure minicom /etc/minicom/minirc.dfl as follow:

# Machine-generated file - use "minicom -s" to change parameters.
pu port             /dev/ttyS0
pu baudrate         9600
pu bits             8
pu parity           N
pu stopbits         1

The launch the minicom command to get a terminal on the switch.

# minicom

Welcome to minicom 2.4

OPTIONS: I18n 
Compiled on Sep  5 2010, 08:31:32.
Port /dev/ttyS0

Press CTRL-A Z for help on special keys                                                              
                                                                                                     
cisco-home>enable
Password: 

cisco-home# sh int

Vlan1 is up, line protocol is up 
  Hardware is EtherSVI, address is 001b.8f48.2cc0 (bia 001b.8f48.2cc0)
  Internet address is 192.168.1.254/24
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
.....

Become root using enable and the admin password.

A few commands:

show interface (sh int) displays the status of all interfaces
sh int gigabitEthernet0/27 displays a specific interface
sh ru displays the running config
conf terminal (conf t) switches to configuration mode
int gigabitEthernet0/27 configures this interface
switchport mode trunk changes the interface to trunk mode
switchport trunk allowed vlan 1,2,4-4094 lists the allowed VLANs on that trunk interface
switchport access vlan 3 puts the whole interface into VLAN 3
switchport trunk allowed vlan 3 allow only vlan 3 on this interface
wr mem saves the running configuration permanently

A few more, see doc: * spanning-tree portfast * spanning-tree bpduguard enable * spanning-tree guard root

Example of interface configuration:

Trunk interface

interface GigabitEthernet0/27
 description Ramiel trunk LAN interface
 switchport trunk allowed vlan 1,2,4-4094
 switchport mode trunk
 spanning-tree portfast
 spanning-tree bpduguard enable
 spanning-tree guard root

Access interface:

interface GigabitEthernet0/13
 description Office 1
 switchport access vlan 3
 switchport trunk allowed vlan 3
 spanning-tree portfast
 spanning-tree bpduguard enable
 spanning-tree guard root