How To Configure Trunking Betwixt Vlans Amongst Isl?

Trunking is a technique to comport dissimilar VLAN traffic using betoken to betoken link betwixt 2 devices. ISL (InterSwitch Link) is a cisco proprietary protocol tin laissez passer the sack piece of employment amongst Ethernet token telephone as well as Fddi also. Trunking changes the formatting of the packets. The ports remove to move inwards understanding every bit to which format is beingness piece of employment to transmit information on the trunk, if at that spot is dissimilar trunking encapsulation on the 2 ends of the link they volition non able to communicate. Similar province of affairs volition move on if i of your ports is configured inwards trunking manner as well as other i every bit inwards access mode.

First practise multiple VLANs amongst name, assign multiple ports to them thence practise ISL body link betwixt the 2 switches to let communication betwixt VLANs. 

To practise a VLAN, start larn inwards global configuration manner to run the next commands.

Configuration to practise VLAN 2 as well as three on switch A 

SwitchA(config)#configure final               (enter inwards global configuration mode) 

SwitchA(config)#vlan 2                                        (defining the vlan 2) 

SwitchA(config)#vlan 2 advert marketing       (assigning the advert marketing to vlan 2) 

SwitchA(config)#vlan 3                                        (defining the vlan 3) 

SwitchA(config)#vlan three advert management    (assigning the advert administration to vlan 3)

SwitchA(config)#exit                                            (exit from vlan 3) 

Now assigning the ports 2 as well as three to VLAN 2, it must move done from the interface mode. Enter the next commands to add together port 2 as well as three to VLAN 2. 

SwitchA(config)#configure terminal                                 (enter inwards global configuration mode) 

SwitchA(config)#interface fastethernet 0/2                     (select the Ethernet 0 of port 2) 

SwitchA(config-if)#switchport access vlan 2                  (allot the membership of vlan 2)

SwitchA(config-if)#exit                                                        (exit from interface 2) 

SwitchA(config)#interface fastethernet 0/3                     (select the Ethernet 0 of port 3) 

SwitchA(config-if)#switchport access vlan 2                  (allot the membership of vlan 2)

SwitchA(config-if)#exit                                                        (exit from interface 3)

 Now assigning the ports iv as well as v to VLAN 3, larn inwards the next commands to add together port iv as well as v to VLAN 3. 

 SwitchA(config)#configure terminal                                 (enter inwards global configuration mode) 

SwitchA(config)#interface fastethernet 0/4                     (select the Ethernet 0 of port 4) 

SwitchA(config-if)#switchport access vlan 3                  (allot the membership of vlan 3)

SwitchA(config-if)#exit                                                        (exit from interface 4) 

SwitchA(config)#interface fastethernet 0/5                     (select the Ethernet 0 of port 5) 

SwitchA(config-if)#switchport access vlan 3                  (allot the membership of vlan 3)

SwitchA(config-if)#exit                                                        (exit from interface 5) 

  

Configuration to practise VLAN 2 on switch B 

SwitchB(config)#configure final               (enter inwards global configuration mode) 

SwitchB(config)#vlan 2                                        (defining the vlan 2) 

SwitchB(config)#vlan 2 advert marketing       (assigning the advert marketing to vlan 2) 

SwitchB(config)#vlan 3                                        (defining the vlan 3) 

SwitchB(config)#vlan three advert management    (assigning the advert administration to vlan 3)

SwitchB(config)#exit                                            (exit from vlan 3)

Now assigning the ports 2 as well as three to VLAN 2, it must move done from the interface mode. Enter the next commands to add together port 2 as well as three to VLAN 2.

SwitchB(config)#configure terminal                                                (enter inwards global configuration mode) 

SwitchB(config)#interface fastethernet 0/2                    (select the Ethernet 0 of port 2) 

SwitchB(config-if)#switchport access vlan 2                 (allot the membership of vlan 2)

SwitchB(config-if)#exit                                                        (exit from interface 2) 

SwitchB(config)#interface fastethernet 0/3                    (select the Ethernet 0 of port 3) 

SwitchB(config-if)#switchport access vlan 2                 (allot the membership of vlan 2)

SwitchB(config-if)#exit                                                        (exit from interface 3) 

Now assigning the ports iv as well as v to VLAN 3, larn inwards the next commands to add together port iv as well as v to VLAN 3. 

SwitchB(config)#configure terminal                                                (enter inwards global configuration mode) 

SwitchB(config)#interface fastethernet 0/4                    (select the Ethernet 0 of port 4) 

SwitchB(config-if)#switchport access vlan 3                 (allot the membership of vlan 3)

SwitchB(config-if)#exit                                                        (exit from interface 4) 

SwitchB(config)#interface fastethernet 0/5                    (select the Ethernet 0 of port 5) 

SwitchB(config-if)#switchport access vlan 3                 (allot the membership of vlan 3)

SwitchB(config-if)#exit                                                        (exit from interface 5) 

Trunking amongst ISL 

Now practise ISL body link betwixt the 2 switches to let communication betwixt VLANs. 

On both switches, SwitchA as well as SwitchB type the next ascendency amongst ISL at the fastethernet 0/1 interface. 

SwitchA(config)#configure terminal                                 (enter inwards global configuration mode) 

SwitchA(config)#interface fastethernet 0/1                     (select the Ethernet 0 of port 1) 

SwitchA(config-if)#switchport manner trunk                (set port 1 every bit body port) 

SwitchA(config-if)#switchport body encapsulation isl 

SwitchA(config-if)#end                                                       (exit from interface 1) 

SwitchB(config)#interface fastethernet 0/1                    (select the Ethernet 0 of port 1) 

SwitchB(config-if)#switchport manner trunk                (set port 1 every bit body port) 

SwitchB(config-if)#switchport body encapsulation isl 

SwitchB(config-if)#end                                                       (exit from interface 1) 

To verify that fastethernet 0/1 has been established every bit body port, type the show interface fastethernet 0/1 switchport at the privileged EXEC mode.