Trunk link is used to carry the different VLANs traffic on a
single link. There are two different protocols are used for Ethernet
trunking, 802. 1q and ISL. Trunking change the formatting of the
packets. The ports need to be in agreement as to which format is being
use to transmit data on the trunk, if there is different trunking
encapsulation on the two ends of the link they will not able to
communicate. Similar situation will occur if one of your ports is
configured in trunking mode and other one as in access mode.
First create multiple VLANs with name, assign multiple ports to them
then create 802.1q trunk link between the two switches to allow
communication between VLANs.
To
create a VLAN, first enter global configuration mode to run the
following commands.
Configuration to create VLAN 2 and 3 on switch A
SwitchA(config)#configure terminal (enter in
global configuration mode)
SwitchA(config)#vlan 2 (defining
the vlan 2)
SwitchA(config)#vlan 2 name marketing (assigning the name
marketing to vlan 2)
SwitchA(config)#vlan 3 (defining
the vlan 3)
SwitchA(config)#vlan 3 name management (assigning the name management
to vlan 3)
SwitchA(config)#exit (exit
from vlan 3)
Now
assigning the ports 2 and 3 to VLAN 2, it must be done from the
interface mode. Enter the following commands to add port 2 and 3 to VLAN
2.
SwitchA(config)#configure terminal
(enter in 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 4 and 5 to VLAN 3, enter the following commands to
add port 4 and 5 to VLAN 3.
SwitchA(config)#configure terminal
(enter in 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 create VLAN 2 on switch B
SwitchB(config)#configure terminal (enter in
global configuration mode)
SwitchB(config)#vlan 2 (defining
the vlan 2)
SwitchB(config)#vlan 2 name marketing (assigning the name
marketing to vlan 2)
SwitchB(config)#vlan 3 (defining
the vlan 3)
SwitchB(config)#vlan 3 name management (assigning the name management
to vlan 3)
SwitchB(config)#exit (exit
from vlan 3)
Now
assigning the ports 2 and 3 to VLAN 2, it must be done from the
interface mode. Enter the following commands to add port 2 and 3 to VLAN
2.
SwitchB(config)#configure
terminal (enter in 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 4 and 5 to VLAN 3, enter the following commands to
add port 4 and 5 to VLAN 3.
SwitchB(config)#configure
terminal (enter in 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 with 802.1q
Now
create 802.1q trunk link between the two switches to allow communication
between VLANs.
On
both switches, SwitchA and SwitchB type the following command with
802.1q at the fastethernet 0/1 interface.
SwitchA(config)#configure terminal
(enter in global configuration mode)
SwitchA(config)#interface fastethernet 0/1 (select
the Ethernet 0 of port 1)
SwitchA(config-if)#switchport mode trunk (set port 1 as
trunk port)
SwitchA(config-if)#switchport trunk 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 mode trunk (set port 1 as
trunk port)
SwitchA(config-if)#switchport trunk encapsulation dot1q
SwitchB(config-if)#end
(exit from interface 1)
To
verify that fastethernet 0/1 has been established as trunk port, type
the show interface fastethernet 0/1 switchport at the privileged
EXEC mode.
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