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VLANs.and.Trunking (2-VLANs (Creating (Create a VLAN Automatically Creates…

- - - - VLAN-1
        
        Cannot be Deleted, But can be manually pruned from Trunks
        
        Cannot Be Pruned by VTP
        
        Default Vlan & 802.1q (Native Vlan)
        
        Should not be used for actual port assignments
      - VLANs 1002-1005
        
        Defult legacy Token Ring /FDDI VLANs
        
        Cannot be Deleted, But can be manually pruned from Trunks
        
        Cannot Be Pruned by VTP
        
        Should not be used for actual port assignments
  - - - VTP is configured in Transparent Mode
      - VTP V3
    - - Some are reserved for "internal" usage
  - - - E.g. Native Layer 3 switch port
      - Show Vlan internal usage
    - - For real deployments, check the internal allocations
      - Some allocate ascending, some descending
  - - - Spaning-Tree instance
      - MAC address table
- - - - One VLAN
    - - Multiple VLANs
      - DTP
        
        Dynamic Trunking Protocol
      - Verfied
        
        show interface switchport
        
        show spanning-tree [vlan | interface]
        
        show interface trunk
      - 802.1q
        
        Open standard
        
        "Native"VLAN set untagged
      - Manual Trunk Pruning
        
        Allowed list can be edited for manual pruning
        
        switchport trunk allowed vlan
        
        Verified
        
        show interface trunk
        
        show interface switchport
        
        Trunk’s “allowed list”
        
        All VLANs (1-4094) by default
    - - Transparent Layer 2 VPN
    - - DTP Negotiation
        
        Enabled by default
        
        DTP Desirable mode
        
        Initiates trunking negotiation
        
        switchport mode dynamic desirable
        
        switchport mode trunk
        
        DTP Auto mode
        
        Passively listen for trunking negotiation
        
        switchport mode dynamic auto
        
        Can be disabled by
        
        switchport mode access
        
        switchport mode dot1q-tunnel
        
        switchport nonegotiate
        
        Verified
        
        show interface switchport