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  • 1. VLAN 1 VLAN ConfigurationThe network lab has two Catalyst 2950T24 switches, withnames Maryland and California, and one Catalyst 2950GSwitch with name Virginia.- References:http://www.cisco.com/en/US/products/hw/switches/ps4916/products_configuration_guide_chapter09186a008017e532.html − The two Catalyst 2950T24’s in the network lab, each has 24 10/100 Base T ports, and two 10/100/1000 Base T ports i.e., gi0/1 and gi0/2. − For Catalyst 2950G (i.e, Virginia), the two 10/100/1000 Base T ports are currently not installed − The 24 10/100 Base T ports are: fa0/1, fa0/1,fa0/2, … fa0/24 − Two 10/100/1000 Base T ports are: gi0/1 and gi0/2Jan. 26,2010 1
  • 2. VLAN 2♦ All the Cisco switches has two operational modes − User Exec Mode : When a user first establishes the connection with the switch, and enter the password, the switch is in ‘User EXEC Mode’, and the prompt is ‘>’. − Privileged Mode: when user enter the command ‘enable’ and supply the password, it enters the privileged mode, and the prompt is ‘#’ − Only in privileged mode, a user can enter configuration mode; to enter configuration mode, user must enter the command ‘config t’ ♦ Configuration commands − The following configuration commands explains how to define a vlan name, assigning a static-access ports to a VLAN, or deleting a VLAN. − A VLAN port can be either in permanent trunk mode, or in non-trunking mode as accessJan. 26,2010 2
  • 3. VLAN 3 Configure Privileged ModeUser Mode enable Mode Config t Router(config)# Router> Router# end disable end Ctrl-Z interface Router(config-if) router Router(config-router)Jan. 26,2010 3
  • 4. VLAN 4♦ What is a Trunk? • A Trunk is a point-to-point link that transmit and receive traffic between switches or switch and routers. • Trunks carry the traffic of multiple VLANs and can extend VLANs across an entire networkI.Define VLAN namestep command purpose1 Config t Enter global configuration mode2 Vlan vlan-id Enter a VLAN ID3 Name vlan-name Enter a name for the VLAN4 end Return to privileged mode5 Show vlan {name | id vlan-id } Verify your entries6 copy running-cnofig startup- Save the configuration in the switch config or wr mem configuration fileJan. 26,2010 4
  • 5. VLAN 5II.Insert interface ports to VLANStep Command Purpose1 Config terminal Enter global configuration mode2 Inter interface-id Enter the interface to be added to the VLAN3 Switchport mode access Define the VLAN membership mode for the port4 Switchport access vlan Assign the port to a VLAN Vlan-id5 end Return to privileged EXEC mode6 Show config or running-config Verify the VLAN membership mode of interf interface-id the interface7 Sh interf interface-id switchport Verify your entries in the Administrative mode and the access mode VLAN field8 Copy running-config startup- Save your entires in the configuration config file Or wr memIII.Deleting a VLANstep command purpose1 Config t Enter global configuration mode2 No vlan vlan-id Remove the VLAN by entering the VLAN-ID3 end Return to privileged mode4 Sh vlan brief Verify the VLAN removed5 copy running-config startu-config Save the configuration in the switch or wr mem startup configuration fileJan. 26,2010 5
  • 6. VLAN 6 ♦ The 26 interface ports of Catalyst 2950 T24 are: • Interface fa0/i, where i= 1. 24 are the 24 10/100 Base T ports • Interface gi0/1 or 0/2 are the two 10/100/1000 Base T ports ♦ The 24 ports of Catalyst 2950G Switch are: • Interface fa0/i, where i= 1. 24 ♦ Switchport mode access – interface is put into permanent nontrunking mode ♦ Switchport mode trunk - interface into permanent trunking modeJan. 26,2010 6
  • 7. VLAN 7Examples of VLAN configurationCalifornia#sh vtp status /* show the vtp status */California#sh vlan /*to show all the vlans configured */California#config t /* this command cause the switch to enter configuration mode, whenall configuration is completed, enter either Ctrl^z or end to return to privileged EXEC mode */California(config)#vlan 10 name vlan10 /* defines name of vlan 10 as vlan10California(config)#int fa0/1California(config)#switchport mode accessCalifornia(config)#switchport access vlan 10 /* set port fa0/1 into vlan 10 */California(config)#int fa0/2California(config)#switchport mode accessCalifornia(config)#switchport access vlan 10California(config)#int fa0/3California(config)#switchport mode accessCalifornia(config)#switchport access vlan 10/* at this point, vlan 10 has 3 members i.e., fa0/1, fa0/2 and fa0/3 */California(config)#vlan 20 name vlan20California(config)#int fa0/5California(config)#switchport mode accessCalifornia(config)#switchport access vlan 20California(config)#int fa0/6California(config)#switchport mode accessCalifornia(config)#switchport access vlan 20California(config)#int fa0/7California(config)#switchport mode accessCalifornia(config)#switchport access vlan 20Jan. 26,2010 7
  • 8. VLAN 8California(config)#int fa0/8California(config)#switchport mode accessCalifornia(config)#ctrl-ZCalifornia# /*return to privileged mode *//* At this poing vlan 20 has 4 members i.e., fa0/5, fa0/6, fa0/7 and fa0/8 */California(config)#int gi0/2California(config)# switchport mode trunk /* this will put the port gi0/2 to be in permanent trunking mode */California(config)#switchport access vlan 40 /* put int gi0/2 into vlan 40 */California(config)#switchport access vlan 20California(config)#end or ctrl-Z /* return to privileged mode */California#wr mem or copy running-config strtup-configJan. 26,2010 8