Review/Perspective: Implement and Troubleshoot VLAN

2.1.c Implement and troubleshoot VLAN

  • 2.1.c [i] Access ports
  • 2.1.c [ii] VLAN database
  • 2.1.c [iii] Normal, extended VLAN, voice VLAN

Layer 2 Switchports can be used for the following:

  • Access Ports – One VLAN – This port will not dynamically negotiate a trunk since its statically set to a specific mode.  Access ports are by default applied to the native vlan (1) however you can statically assign a specific VLAN for the access port to participate in by configuring it under the interface as well.
    accessport

    • show int <interface> switchport – shows all attributes of the access port.
      sh int x switchport - access.PNG
  • VLAN Database – this file is saved in the NVRAM of the switch.  This preserves the VLAN information in case the switch loses power.  The VLAN database is saved in the VLAN.dat file.
    show-vlan
  • Normal VLAN range is 1 – 1001
  • Reserved VLAN range is 1002 – 1005
  • Extended VLAN range is 1006 – 4094
  • Voice VLANs are used on access ports to trunk voice traffic on top of data traffic on an access port
    voice vlan.PNG

 

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