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VLAN Trunk

  • Trunk Link
  • Tagged Frames
  • Access Ports
  • Untagged Frames

Trunking Protocols

  • IEEE 802.1q
  • Available cross platform
  • Cisco Inter-Switch Link (ISL)
  • Cisco Only

Configure VLAN Trunk

Example

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10.0.0.10/24 ---(F0/1) [Switch1] -{TrunkLink}- [Switch2]     (F0/1)--- 172.16.0.10/24
                  (F0/4)|                       |(F0/2)
    10.0.0.11/24--------|                       |--------172.16.0.11/24

Config

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en
conf t
vlan 10
name LEFT

vlan 20
name RIGTH
exit
exit

int f0/1
switchport mode access vlan 20

inf f0/2
switchport mode access vlan 10
exit
exit

# Configuring Trunk Link
int f0/24
switchport mode trunk
switchport trunk allowed vlan 10,20
exit
exit

show vlan
show interface trunk # show info about trunk link(s)