Communication between different switches of the same VLAN

Ethernet switch port classification

ACCESS Port: unTagged port, i.e. access port . Can only belong to one VLAN , his frame transmitted without the VLAN tag , for connection to a computer port.

Trunk port: Tag Aware port, ie trunk interfaces . May allow multiple VLAN through, he transmitted frames with VLAN tags , is generally used between the switch port.

VLAN trunk, Profile Role: https://baike.baidu.com/item/VLAN%20Trunk

How communication between different VLAN switches do the same?

Figure:

It can be seen also on the different switch ports connected to FIG can withdraw cash;

Each data frame will be marked with the switch VLAN identification (different colors). Namely: in the relay link to tag, after the transmission of the different tags can identify different VLAN information transmission;

Ethernet relay service on the way:

Can be achieved in two VLAN ID:

1. ISL (Cisco proprietary)

2. IEEE 802.1Q (use more)

Principle two methods, frame formats; and a comparator;