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VLAN Trunking Protocol (VTP) of Cisco Catalyst switches to simplify management of the VLAN database across multiple switches.
in adition open method to configure trunk we use IEEE802.1q mode in Cisco Switches as well
in cisco example as below
conf t
int fa0
switchport mode trunk
switchport trunk encapsulation dot1q
exit
when you want to allow certain val in this trunk use below
switchport trunk allowed vlan Number1, Number2
Inter-Switch Link (ISL), which is a Cisco proprietary protocol
