Cisco VLAN

Following is an example Cisco VLAN configuration.

Create and name two VLANs in Cisco switch
Switch_A#vlan database
Switch_A(vlan)#vlan 2 name VLAN2
Switch_A(vlan)#vlan 3 name VLAN3

Assign ports to VLAN 2
Switch_A#configure terminal
Switch_A(config)#interface fastethernet 0/2
Switch_A(config-if)#switchport mode access
Switch_A(config-if)#switchport access vlan 2

Telnet sessions

1. Suspend the current Telnet session: Ctrl-Shift-6 x
   
   • enter
2. show sessions: Reveals all sessions are in used.
3. To Resume the previouly suspended telnet session:
   
   • Type the number of the session shown on show sessions

Cisco CDP Configuration

These are some of the Cisco IOS commands use in managing CDP on Cisco router & switch

1. show cdp interface
2. show cdp neighbors
3. show cdp neighbors detail
4. debug cdp packets
5. undebug all
6. show cdp traffic
7. clear cdp counters

Using Cisco IOS show commands

Following are some of the Cisco IOS show command on Cisco router / switch

1. show ?
2. show version
3. show clock
4. show hosts
5. show users
6. show history
7. show arp
8. show flash
9. show running-config
10. show starup-config
11. show interface
12. show protocol

Router Operation

Some notes on Cisco IOS router configuration.

Using TFTP for Cisco IOS Backup & Updates

Router#copy tftp flash

Using TFTP for Configuration File Backups & UPdates
Router#copy running-config tftp
Router#copy startup-config tftp
Router#copy tftp startup-config

Cisco Networking Basics

Private Addressing

1. 10.0.0.0 - 10.255.255.255
2. 172.16.0.0 - 172.31.255.255
3. 192.168.0.0 - 192.168.255.255

Access to Cisco Router

1. Console Port (Protocol: EIA/TIA-232)
2. Auxiliary Port (Protocol: EIA/TIA-232)
3. Telnet / Secure Shell (SSH)
4. HTTP / HTTPS Server
5. SNMP