Trunk link is used to behavior the dissimilar VLANs traffic on a unmarried link. There are 2 dissimilar protocols are used for Ethernet trunking, 802. 1q together with ISL. Trunking modify the formatting of the packets. The ports require to move inward understanding every bit to which format is existence role to transmit information on the trunk, if in that place is dissimilar trunking encapsulation on the 2 ends of the link they volition non able to communicate. Similar province of affairs volition happen if i of your ports is configured inward trunking trend together with other i every bit inward access mode.
First exercise multiple VLANs amongst name, assign multiple ports to them together with then exercise 802.1q body link betwixt the 2 switches to let communication betwixt VLANs.
To exercise a VLAN, starting fourth dimension function inward global configuration trend to run the next commands.
Configuration to exercise VLAN 2 together with iii on switch A
SwitchA(config)#configure finally (enter inward 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 iii advert management (assigning the advert administration to vlan 3)
SwitchA(config)#exit (exit from vlan 3)
Now assigning the ports 2 together with iii to VLAN 2, it must move done from the interface mode. Enter the next commands to add together port 2 together with iii to VLAN 2.
SwitchA(config)#configure terminal (enter inward 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 together with v to VLAN 3, function inward the next commands to add together port iv together with v to VLAN 3.
SwitchA(config)#configure terminal (enter inward 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 exercise VLAN 2 on switch B
SwitchB(config)#configure finally (enter inward 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 iii advert management (assigning the advert administration to vlan 3)
SwitchB(config)#exit (exit from vlan 3)
Now assigning the ports 2 together with iii to VLAN 2, it must move done from the interface mode. Enter the next commands to add together port 2 together with iii to VLAN 2.
SwitchB(config)#configure terminal (enter inward 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 together with v to VLAN 3, function inward the next commands to add together port iv together with v to VLAN 3.
SwitchB(config)#configure terminal (enter inward 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 802.1q
Now exercise 802.1q body link betwixt the 2 switches to let communication betwixt VLANs.
On both switches, SwitchA together with SwitchB type the next ascendency amongst 802.1q at the fastethernet 0/1 interface.
SwitchA(config)#configure terminal (enter inward global configuration mode)
SwitchA(config)#interface fastethernet 0/1 (select the Ethernet 0 of port 1)
SwitchA(config-if)#switchport trend trunk (set port 1 every bit body port)
SwitchA(config-if)#switchport body encapsulation dot1q
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 trend trunk (set port 1 every bit body port)
SwitchA(config-if)#switchport body encapsulation dot1q
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.
