Network Design Concepts; Layer 2 Network Design Concepts; Vlan - Fujitsu PRIMERGY 10/40GbE Connection Blade 18/8+2 Function Manual

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Table Of Contents

Table of Contents

Chapter 1

1.1

Layer 2 network design concepts

1.1.1 VLAN

In layer 2 network, the destination is determined based on MAC address. And Layer2 network can be divided by

logical network called VLAN. It can make one logical network from multiple physical network or multiple logical

network from one physical network. Each VLAN is managed with VLAN ID(VID).

VLAN ID

VLAN is managed by VLAN ID which number is from 1 to 4094 in decimal. The communication between the

same VLAN ID is possible but between the different VLAN ID is not possible.

Type of VLAN

There are three type of VLAN.

• Port VLAN

This is to set "which vlan is belonged" to each Ethernet port. The port will belong to assigned VLAN

• Tag VLAN

It is used when multiple VLANs are set on 1 physical line. Multiple VLANs are implemented on 1 physical line by

inserting VLAN header in the frame header of Ethernet by the method standardized in IEEE802.1Q.

• Protocol VLAN

In the frame header of Ethernet, there is a field of 16 bits called as frame type, and upper level protocol which

is stored in that frame can be identified.

For example, communication of different network protocol called as IP and IPX can be identified at the level of

the Ethernet frame. VLAN protocol uses this information and VLAN different in each network protocol can be

identified.

For example, VLAN for each sub network is divided and routing is executed in IP. However, in the IPX protocol

setting is executed where it is treated as 1 network without any divisions.

The setting of each ETHER port can be changed for these three types. In other words, when VLAN ID is 10, VLAN

can be set as VLAN port in ETHER port 1, and tag VLAN in ETHER port 2. The data of 10 VLAN is sent and

received by ETHER port 1 and ETHER port 2, and it is sent and received as a normal frame without tag by ETHER

port 1 and the frame with tag by ETHER port 2 in VLAN ID.

Port VLAN

（VID20）