Nokia VPN Services Tunnel Structure

VPN-Labels

Nokia VPN Services Tunnel Structure

In this article I want to tell you about the tunnels used for services that is set up via MPLS. Here there are some key points that you must know to understand service structure well.

Think about physically we have one port. In services structure, there are transport tunnels that is set up via LDP or RSVP-TE. AS you know LDP and RSVP-TE are the two protocols that are used in MPLS as label swithing protocols. Shortly, transport tunnels are the tunnels that the label swithing is done with transport labels. This is the outher label of the VPN packet.LSPs (Label Swithed Paths) are set up with these protocols.

As you know VPN packets has two labels. One is the classical label, here it is mentioned as transport label. And the other is for customer specific VPN label. This is mentioned as service label in here.

The service labels(VPN labels) are set up with MP-BGP or TLDP(Targeted LDP). This label is the inner label. Packets transport across the provider network with switching the outher label(transport label). But when the packet leaves the provider core, at the edge, packet is routed acording to the inner label(service label or VPN label). Service labels identifies the destination customer site which the service will arrive.

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