VLANs and Trunks
Categories Cisco
Standard VLANs range 1 – 1005
VLAN 1
Default VLAN & default 802.1q Native VLAN
Can not be deleted, but can be manually pruned from trunks
Can not be pruned by VTP
Should not be used for actual port assignments
VLAN should be used only for control plane. It should be pruned on trunks when possible.
Extended VLANS range 1006 – 4094
Normally only used in one of two cases:
VTP is configured in transparent mode
VTP Version 3
Not all extended VLANs can be used – some are used as internal VLANs.
An example of this would be creating a routed port on a switch.
show vlan internal usage
sh run | i ascending | descinding
Layer 2 Trunking
802.1q
open standard
Native VLAN sent untagged
DTP
Dynamic Trunking Protocol
sh int trunk
sh int switchport
sh spann vlan/interface x
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