Switchport Trunk Encapsulation isl Command on CISCO Router/Switch

Command

Switchport Trunk Encapsulation isl

Use

Enables ISL trunking encapsulation on the interface.

Syntax

Switch(config-if)#switchport trunk encapsulation isl

Example

In this example, isl trunk encapsulation is enabled SW3’s fa0/2.

SW3(config)#int fa0/2
SW3(config-if)#switchport trunk encapsulation isl

Next, the trunk information is displayed for SW3.

SW3(config-if)#do show interface trunkPort Mode Encapsulation Status Native vlan
Fa0/20 auto n-802.1q trunking 1
Fa0/21 auto n-802.1q trunking 1
Fa0/22 auto n-802.1q trunking 1
Port Vlans allowed on trunk
Fa0/20 1-4094
Fa0/21 1-4094
Fa0/22 1-4094

Port Vlans allowed and active in management domain
Fa0/20 1,10-20,55,99,555
Fa0/21 1,10-20,55,99,555
Fa0/22 1,10-20,55,99,555

Port Vlans in spanning tree forwarding state and not pruned
Fa0/20 none
Fa0/21 1,10-11
Fa0/22 none

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