Tag - vlan

Virtual Local Area Network (VLAN)

Virtual Local Area Network (VLAN)

Virtual Local Area Network (VLAN) is a logical grouping of hosts. This grouping allows them to communicate if they are on the same LAN, irrespective of the physical topology of the network. VLAN offer the ability to group computers together into logical workgroups. This can simplify network administration when connecting clients to servers that are geographically distributed. Typically, VLAN consist of co-workers in the same department but in different locations or a cross functional team working on a joint endeavor.

Virtual Area Network (VLAN)

 

Virtual Local Area Network (VLAN)

Virtual Local Area Network (VLAN) is a logical grouping of hosts. This grouping allows them to communicate if they are on the same LAN, irrespective of the physical topology of the network. VLAN offer the ability to group computers together into logical workgroups. This can simplify network administration when connecting clients to servers that are geographically distributed. Typically, VLAN consist of co-workers in the same department but in different locations or a cross functional team working on a joint endeavor.

 

VLAN Types:

There are two basic types of VLAN:

  1. Tagged: VLAN is based on the IEEE 802.1Q specification. Each packet has a 4-byte tag added to the packet hearer. The switch must support IEEE 802.1Q tagging and be properly configured. Please check your switch documents for the correct switch configuration.
  2. Un-tagged: Or Port-based VLANs are statically configured on the switch. They are transparent to connected devices.

 

Execution Reviews:

  • Many companies software supports maximum of 64 VLANs per network port or team.
  • To set up IEEE VLAN membership (Multiple VLANs), the adapter must be attached to a switch with IEEE 802.1Q VLAN capability.
  • VLAN can co-exist with teams (if the adapter supports both). The team must be defined first, then you can set up your VLAN.
  • You can set up only one untagged VLAN per port or team. You must have at least one tagged VLAN before you can set up an un-tagged VLAN.
  • After creating the VLAN, the adapter associated with the VLAN can have a temporary loss of connectivity.
  • A VLAN cannot be removed if a virtual NIC is bound to it.
  • If VLAN is assigned to an adapter, the Priority and VLAN option on the Advanced properties tab is enabled and cannot be disabled until all VLAN is removed from the adapter.
  • If you change the setting under the Advanced tab for one VLAN, it changes the settings for all VLANS using that port.
  • Advanced Networking Services (ANS) VLANs are not supported on adapters and teams that have VMQ enabled. But, VLAN filtering with VMQ is supported via Microsoft Hyper-V VLAN interface.
  • You can have different VLAN tags on a child partition and its parent. Those settings are separate from one to another, and can be different or the same. The VLAN tag on the parent and child must be the same if you want the parent and child partitions to be able to communicate through that VLAN.

For more information see Microsoft Hyper-V virtual NIC on teams and VLANs.

 

Advantages of VLAN:

  • Improve LAN configuration updates (Adding, Editing, Moves).
  • Improve network performance.
  • Simplicity in your management tasks.
  • Frontier for broadcast storms.
  • Reduce security complications.

 

Before Patch Installation:

 Before Patch Installation (VLAN)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

After Patch Installation:

After Patch Installation (VLAN)

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How DHCP different than VLAN

6. How is it different than VLANs?

DHCP and VLANs, which are very different in concept, are sometimes cited as different solutions to the same problem. While they have a goal in common (easing moves of networked computers), VLANs represent a more revolutionary change to a LAN than DHCP. A DHCP server and forwarding agents can allow you to set things up so that you can unplug a client computer from one network or subnet and plug it into another and have it come alive immediately, it having been reconfigured automatically. In conjunction to Dynamic DNS, it could automatically be given its same name in its new place. VLAN-capable LAN equipment with dynamic VLAN assignment allows you to configure things so a client computer can be plugged into any port and have the same IP number (as well as name) and be on the same subnet. The VLAN-capable network either has its own configuration that lists which MAC addresses are to belong to each VLAN, or it makes the dvcermination from the source IP address of the IP packets that the client computer sends. Some differences in the two approaches:

DHCP handles changes by reconfiguring the client while a VLAN-capable network handles it by reconfiguring the network port the client is moved to.
DHCP dynamic reconfiguration requires a DHCP server, forwarding agent in each router, and DHCP capability in each client’s TCP/IP support. The analogous capability in VLANs requires that all hubs throughout the network be VLAN-capable, supporting the same VLAN scheme. To this point VLAN support is proprietary with no vendor interoperability, but standards are being developed.
DHCP can configure a new client computer for you while a VLAN-capable network can’t.
DHCP is generally aimed at giving “easy moves” capability to networks that are divided into subnets on a geographical basis, or on separate networks. VLANs are generally aimed at allowing you to set up subnets on some basis other than geographical, e.g. instead of putting everyone in one office on the same subnet, putting each person on a subnet that has access to the servers that that person requires.
There is an issue with trying to use DHCP (or BOOTP) and VLANs at the same time, in particular, with the scheme by which the VLAN-capable network dvcermines the client’s VLAN based upon the client computer’s source IP address. Doing so assumes the client computer is already configured, which precludes the use of network to get the configuration information from a DHCP or BOOTP server.

7. What protocol and port does DHCP use?
DHCP, like BOOTP runs over UDP, utilizing ports 67 and 68.

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