What does MPLS stands for?

MPLS stands for Multi-protocol label switching 

What is a Layer 2 MPLS VPN?

• Uses an MPLS network in the provider core to deliver Layer 2 services to the customers. 
• Uses EoSDH, IPRAN and IPCORE Backhaul for the connectivity.  
• Has Ethernet Interface (FE or GE) as connectivity to customer router.

Is MPLS an alternative to IP?

• \         No.
•          There are many, many things that MPLS can't do. It's a supplement to IP to provide additional connection oriented capabilities to the network.
•         MPLS is Layer 2.5 technology while IP is layer 3. 

What are the goals of a Layer 2 MPLS VPN?

•        A Layer 2 MPLS VPN is exactly the same as a Layer 2 VPN.
•          A Layer 2 MPLS VPN allows the use of a single network technology (namely, MPLS) to offer many services, including IP, Layer 2 VPNs, Layer 3 VPNs, MPLS traffic engineering, and Differentiated Services (DiffServ).
•          A single network architecture that offers multiple services is often referred to as a converged network.
•          A single access line to provide multiple services is also beneficial to a service provider.

What are alternate Layer 2 MPLS VPN proposals?

More than one Layer 2 MPLS VPN architecture has been under consideration by the Provider-provisioned Virtual Private Network Working Group (PPVPN WG) of the IETF. The primary proposals were known as draft-Kompella and draft-Martini, and these were the file names of the versions of those drafts as of November 2001:

■Draft-martini-l2circuit-trans-mpls-07.txt

■Draft-martini-l2circuit-encap-mpls-03.txt

■Draft-kompella-ppvpn-l2vpn-00.txt

Note:

Be sure to check the Internet Drafts http://www.ietf.org/ID.html section of the IETF Web site for updates, because the drafts change often. The answer to question number 12 explains the status of those drafts in November 2001.

When should a service provider deploy a Layer 2 MPLS VPN rather than another VPN technology?

The simplest case is when the service provider’s customer is already using a Layer 2 VPN. Migration is fairly straightforward in this case. Other situations where a Layer 2 MPLS VPN is preferable are when a service provider is using non-IP protocols or has a large number of routes in its network. An important factor to note in contrasting Layer

2 and Layer 3 MPLS VPNs is that Layer 2 MPLS VPNs usually require the provider’s customer to have more routing expertise.

How is a Layer 2 MPLS VPN different from a Layer 3 MPLS VPN?

The main difference, from the service provider’s point-of-view, is that there is no Layer 3 routing information exchange between the customer and the service provider. The other difference is that the service provider does not need to care nor to know what network-layer protocol the customer uses. On the flip side, Layer 2 MPLS VPNs currently require that all sites in the service provider’s customer network connect to the service provider with the same Layer 2 technology (for example, that all use Frame Relay). This Layer 2 dependence gives the customer Layer 3 independence, because the customer can run any Layer 3 protocol. There is also an intermediate solution, called Layer 2 interworking, whereby each

customer site can connect with a different Layer 2 technology, but the Layer 3 protocol is limited to IP. In a Layer 3 MPLS VPN, however, the various sites can connect with any technology.

How is it different from Circuit Cross-connect?

There are two major advantages of Layer 2 MPLS VPNs over Circuit Cross-connect: First, with Circuit Cross-connect, you must configure point-to-point circuits. Building a VPN in this manner is tedious, because adding or removing a site requires a fair amount of work, as well as touching lots of routers. With Layer 2 MPLS VPNs, you can configure a VPN specifically, so the configuration is much more straightforward. Adding or removing a site is also much simpler, and in many cases it involves touching only the one router attached to the site. Second, each Circuit Cross-connect requires a dedicated provider edge-to-provider edge label-switched path (PE-to-PE LSP), and this LSP must be signalled by using

RSVP. (Using Label Distribution Protocol [LDP] makes no sense in a Circuit Cross-connect, point-to-point scenario, because it employs a reverse-path tree approach.) Layer 2 MPLS VPNs use label stacking, so a single PE-to-PE LSP can be used for multiple VPNs and, in fact, for multiple services. This makes it an extremely scalable technology. Furthermore, this LSP can be set up through any means, including RSVP and LDP. Label-stacking techniques also support greater infrastructure scalability.

What are the benefits of a Layer 2 MPLS VPN to a service provider and to an enterprise customer?

To a service provider, this is a significant migration step toward a single IP- and MPLS-based infrastructure for all services. Existing tail-circuit technology (Frame Relay or ATM) can be re-used. This not only makes the transition familiar to operators and maximizes the service provider’s investment, but also retains the operational simplicity of those existing technologies (thus no responsibility for customer routing). Auto provisioning makes deployment easier at scale. By using label-stacking techniques, Layer 2 MPLS VPNs are specifically designed for scalability and for deployment in carrier-of-carriers environments. For enterprise customers, the scalability of this technology is well-suited to large corporations. 

MPLS can provide multiprotocol connectivity (IPX and SNA, for instance), and it also easily supports IP multicasting. Customers that are accustomed to managing their own routing domains can continue to do so. They can also deploy extra security, such as IPSec encryption.

Will MPLS replace Frame Relay or ATM as the VPN technology of choice?

·         Layer 2 or Layer 3 MPLS VPN can run on frame relay, ATM infrastructure. A common choice of technology for the service provider’s core network is SONET/SDH.
·         Layer 2 MPLS VPNs allow service providers full freedom to choose internal network technologies independent of the Layer 2 VPN service offerings.
·         Currently most VPN networks are based on MPLS technology. Customer prefer MPLS VPN because of its flexibility, scalability and multilevel protection offered by IP network.

Could IPSec be transported over Kompella and Martini Internet Draft-based VPN networks?

Certainly. If the customer wants more security than is provided by simple isolation, Encryption, or authentication, using IPSec or other means would complement Layer 2 MPLS VPNs well. In fact, this is highly recommended.

MPLS VPN

What is MPLS VPN?

MPLS VPN is a family of methods for harnessing the power of multiprotocol label switching (MPLS) to create virtual private networks (VPNs). MPLS VPN gives network engineers the flexibility to transport and route several types of network traffic using the technologies of a MPLS backbone.

Keeping pace with the technological trend to provide latest and varied value added services to its customers, Service Provider harnesses IP Infrastructure based on MPLS Technology to offer world class IP VPN services.

 MPLS is an acronym for "Multi Protocol Label Switching". 

MPLS(Multi Protocol Label Switching) VPN is a technology that allows a Service Provider to have complete control over parameters that are critical to offering its customers service guarantees with regard to bandwidth throughputs, latencies and availability.

 The technology enables secure Virtual Private Networks (VPN) to be built and allows scalability that will make it possible for Service Provider to offer assured growth to its customers without having to make significant investments.

 Service Provider would now be geared to provide Bandwidth on demand, Video Conferencing, Voice Over IP (VoIP) and a host of other value added services that could revolutionize the way a corporate business works! 

Registration form example using VB.net

Please Comment for any program down in the comment box.

Opening, Closing, and Hiding Forms with Visual Basic .NET

Opening,Showing, Closing, and Hiding Forms with Visual Basic .NET

NOTE-Before you can open (or close) a form, you need to know the specific name of the form you want to open or close. The Solution Explorer window lists the names of all the forms that make up your Visual Basic .NET program, such as a form named frmMain.vb.

Opening a form:

After you know the name of the form that you want to display, you need to use BASIC command to open the form, such as the following:

Dim oForm As FormName
oForm = New FormName()
oForm.Show()
oForm = Nothing

Hiding a form

If you want to temporarily make a form disappear, you can use the magic Hide command, such as:

FormName.Hide()

Showing a form

After you've hidden a form, you'll eventually want to make it visible again by using the Show command, such as:

FormName.Show()

Closing a form

Hiding a form just tucks it out of sight, but the form is still loaded in the computer's memory. To clear a form out of memory, you need to use the Close command, such as:

FormName.Close()

How to: Add Windows Forms to a Project(Inserting a Form into a Project)

Inserting a Form into a Project

To insert a form into your project

1. From Class View, select the project to which you want to add the form, and click the right mouse button.
2. From the shortcut menu, click Add and then click Add Class.

   If the New Form command is not available, your project may be based on the Active Template Library (ATL). To add a form to an ATL project, you must specify certain settings when first creating the project.
3. From the MFC folder, click MFC Class.
4. Using the MFC Class Wizard, make the new class derive from CFormView.

Visual C++ adds the form to your application, opening it inside the Dialog editor so that you can begin adding controls and working on its overall design.

Sources: https://msdn.microsoft.com/en-us/library/fhxbke21.aspx

Simple Form for adding the leaves of an Employee

How to: Delete records from SQL table in VB.Net

How to: Delete records from SQL table in VB.Net 

Code to delete a record from SQL table using VB.Net is as follows:

Note-
1: Double Click the delete button and copy the following code
2:And also change the server in connection string and the database also

Private Sub Button3_Click(sender As System.Object, e As System.EventArgs) Handles Button3.Click
        Try
            con.ConnectionString = "Server=.\SQLEXPRESS;Database=Employee Details;Trusted_Connection=True"
            con.Open()
            cmd.Connection = con
            cmd.CommandText = "Delete From emp_det where emp_id like @emp_id"

            cmd.Parameters.Add(New SqlParameter("@emp_id", TextBox1.Text))
            cmd.ExecuteNonQuery()
            If MessageBox.Show("Do you really want to Delete this Record?", "Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) = DialogResult.No Then

                MsgBox("Operation Cancelled")

                Exit Sub

            End If
        Catch ex As Exception
            MessageBox.Show("Error while deleting record on table..." & ex.Message, "Delete Records")

        Finally

            con.Close()

        End Try

    End Sub

Allow Numbers only in a TextBox - Visual Basic .NET

So the code for allowing only numbers in the textbox for employee ID is:

Just copy the code in the box given below:

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress         If Asc(e.KeyChar) <> 13 AndAlso Asc(e.KeyChar) <> 8 AndAlso Not IsNumeric(e.KeyChar) Then             MessageBox.Show("Please enter numbers only")             e.Handled = True         End If End Sub

The Result: