VLAN - Revision history

135.26.232.130: /* Advantages of VLAN */

2018-04-12T20:44:33Z

‎Advantages of VLAN

Mhammett: Add to the networking category

2009-12-06T19:13:59Z

Add to the networking category

Nollan: --netdev_add is depreciated --> --netif_add is used now.

2008-06-12T22:04:21Z

--netdev_add is depreciated --> --netif_add is used now.

Botinki Kira: Robot: Automated text replacement (-VE +container)

2008-03-11T13:24:09Z

Robot: Automated text replacement (-VE +container)

Botinki Kira: Robot: Automated text replacement (-VEID +CTID)

2008-03-11T09:45:24Z

Robot: Automated text replacement (-VEID +CTID)

Kir: Added /* External links */ section

2007-02-07T11:19:37Z

Added ‎External links: section

Major: VLAN

2007-02-05T09:53:35Z

VLAN

New page

A virtual LAN, commonly known as a '''vLAN''' or as a '''VLAN''', is a method of creating independent logical networks within a physical network. Several VLANs can co-exist within such a network. This helps in reducing the broadcast domain and administratively separating logical segments of LAN (like company departments) which should not exchange data using LAN (they still can by routing).

A VLAN consists of a network of computers that behave as if connected to the same wire - even though they may actually be physically connected to different segments of a LAN. Network administrators configure VLANs through software rather than hardware, which makes them extremely flexible. One of the biggest advantages of VLANs emerges when physically moving a computer to another location: it can stay on the same VLAN without the need for any hardware reconfiguration.

VLAN 1 is the default VLAN; it can never be deleted. All untagged traffic falls into this VLAN by default.

==Advantages of VLAN==
* Increases the number of '''broadcast domains''' but reduces the size of each '''broadcast domain''', which in turn reduces network traffic and increases network security (both of which are hampered in case of single large broadcast domain)
* Reduces management effort to create subnetworks
* Reduces hardware requirement, as networks can be logically instead of physically separated
* Increases control over multiple traffic types.

== Common VLAN configurations for VE ==
VLAN can be used in following ways:
* Create VLAN device on physical network interface (eth0) and move it (VLAN device) to VE:
<pre>
host # vconfig add eth0 <vlan_id>
host # vzctl set <VEID> --netdev_add eth0.<vlan_id> --save
</pre>
* Create VLAN device inside VE on veth device
<pre>
ve # vconfig add eth0 <vlan_id>
</pre>

The second option is available only in kernel with virtualized VLAN (since 2.6.18-028test005 version).

← Older revision		Revision as of 19:13, 6 December 2009
Line 28:		Line 28:
	* [http://en.wikipedia.org/wiki/VLAN wikipedia:VLAN]		* [http://en.wikipedia.org/wiki/VLAN wikipedia:VLAN]
	* [http://en.wikipedia.org/wiki/IEEE_802.1Q wikipedia:IEEE 802.1Q]		* [http://en.wikipedia.org/wiki/IEEE_802.1Q wikipedia:IEEE 802.1Q]
		+	[[Category:Networking]]

@@ Line 16: / Line 16: @@
 <pre>
 host #  vconfig add eth0 <vlan_id>
-host #  vzctl set <CTID> --netdev_add eth0.<vlan_id> --save
+host #  vzctl set <CTID> --netif_add eth0.<vlan_id> --save
 </pre>
 * Create VLAN device inside container on veth device

← Older revision		Revision as of 11:19, 7 February 2007
Line 24:		Line 24:

	The second option is available only in kernel with virtualized VLAN (since 2.6.18-028test005 version).		The second option is available only in kernel with virtualized VLAN (since 2.6.18-028test005 version).
		+
		+	==External links==
		+	* [http://en.wikipedia.org/wiki/VLAN wikipedia:VLAN]
		+	* [http://en.wikipedia.org/wiki/IEEE_802.1Q wikipedia:IEEE 802.1Q]

@@ Line 6: / Line 6: @@
 ==Advantages of VLAN==
-* Increases the number of '''broadcast domains''' but reduces the size of each '''broadcast domain''', which in turn reduces network traffic and increases network security (both of which are hampered in case of single large broadcast domain)
+* Increases the number of '''broadcast domains''' but reduces the size of each '''broadcast domain''', which in turn reduces network traffic and increases network security (two of the main weaknesses in having a single large broadcast domain)
 * Reduces management effort to create subnetworks
 * Reduces hardware requirement, as networks can be logically instead of physically separated

@@ Line 11: / Line 11: @@
 * Increases control over multiple traffic types.
-== Common VLAN configurations for VE ==
+== Common VLAN configurations for container ==
 VLAN can be used in following ways:
-* Create VLAN device on physical network interface (eth0) and move it (VLAN device) to VE:
+* Create VLAN device on physical network interface (eth0) and move it (VLAN device) to container:
 <pre>
 host #  vconfig add eth0 <vlan_id>
 host #  vzctl set <CTID> --netdev_add eth0.<vlan_id> --save
 </pre>
-* Create VLAN device inside VE on veth device
+* Create VLAN device inside container on veth device
 <pre>
 ve #  vconfig add eth0 <vlan_id>