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ISL Trunking Encapsulation on Switch

ISL Trunking is Cisco protocol

The switches are configured with basic functions: Example is for the 'Switch 1'

Figure 1.

Two Switches in the IT Network and ISL Trunking Encapsulation

Switch_A#enable
Switch_A#class (password)
Switch#show vlan (view table VLANs where we can see info about inclusion interfaces, at this moment, all interfaces ports belong to the default VLAN)
Switch#vlan database (ulazak u configuration mode za VLAN-ove na switchu, add or delete VLAN)
Switch(vlan)#vlan 10 name Accounting (create a new VLAN named Accounting)
Switch(vlan)#vlan 20 name Marketing (create a new VLAN named Marketing)
Switch(vlan)#vlan 30 name Engineering (create a new VLAN named Engineering)
Switch(vlan)#exit

Switch#configure terminal
Switch(config)#interface fastethernet 0/4 (entry in config mode fastethetnet interfaces 0/4)
Switch(config-if)#switchport mode access (change a switchport to a non-default VLAN, entry in config mode where we switch port from the default VLAN 1 in NON default Vlan in this case it is VLAN 10)
Switch(config-if)#switchport access vlan 10 (switch-setting interface and FA0/4 in VLAN10)

Switch(config-if)#interface fastethernet 0/5
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 10

Switch(config-if)#interface fastethernet 0/6
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 10
Switch(config-if)#exit

Switch(config)#interface fastethernet 0/7
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 20

Switch(config)#interface fastethernet 0/8
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 20

Switch(config-if)#interface fastethernet 0/9
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 20
Switch(config-if)#exit

Switch(config)#interface fastethernet 0/10
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 30

Switch(config)#interface fastethernet 0/11
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 30

Switch(config-if)#interface fastethernet 0/12
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 30
Switch(config-if)#end

View VLAN table on the Switch

where we can see the info belonging to interfaces/ports

Switch#show vlan 

Figure 2.

View created VLAN's

Try to ping the IP address 192.168.1.5 => unsuccessfully
Not set Cisco ISL protocol on ports Fa0/1 which connect two switches

Switch#configure terminal
Switch(config)#interface fastethernet 0/1 (entry in config mode fastethetnet interfaces 0/1)
Switch(config-if)#switchport mode trunk (set the switchport trunk type Fa0/1)
Switch(config-if)#switchport trunk encapsulation isl (setting ISL trunk on port Fa0/1)
Switch(config-if)#end

View and check ISL trunking encapsulation

Switch#show interface fastethernet 0/1 switchport (check the set trunk type on Fa0/1)

Figure 3.

ISL Trunkencapsulation oj the Switch

This configuration you can learn on the Cisco Network Academy - CCNA education