VLAN Trunking Protocol (VTP)

VLAN is a group of devices/users physically connected to one or more switches, but they are logically separated. All devices in a single VLAN receive broadcast sent by a device in that respective VLAN. By default, all interfaces of switch are in a single VLAN or single broadcast domain.

It’s a very simple job to configure VLANs on few switches; you just have to manually access every switch and configure VLANs. But it will be a very tedious job to configure VLANs manually on each and every switch in the large network.

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Trunk Links

Trunk links have a capability to carry multiple VLANs on a single link and should be used for interconnecting switches. By default, switch interfaces can carry only one VLAN data.

As in Figure 1, there are two VLANs on SW-A, VLAN 2 and 3. User A-1 is in VLAN 2 and User A-2 is in VLAN 3. Same way there is two VLANs on SW-B. User B-1 is in VLAN 3 and User B-2 is in VLAN 3.

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VLAN Membership

In static VLAN configuration VLANs are manually created and assigned to switch interfaces. VLAN assignment to interfaces cannot be deleted or altered without any manual intervention, that’s why this method is most secure and very simple to configure.

IP configuration on hosts or user PCs must match with VLAN membership on switches.

As in figure 3, interface g0/1 and g0/2 are manually configured in VLAN 2 and interface g0/3 and g0/4 are in VLAN 1. By default, all interfaces of switches are in VLAN 1.

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