3com S7906E Manuel De Montage
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Tunneling Configuration
When configuring tunneling, go to these sections for information you are interested in:
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Tunneling Overview
Introduction to the Tunneling Technology
Tunneling is an encapsulation technology, which utilizes one network protocol to encapsulate packets of
another network protocol and transfer them over the network. A tunnel is a virtual point-to-point
connection providing a channel to transfer encapsulated packets. Packets are encapsulated and
decapsulated at both ends of a tunnel. Tunneling refers to the whole process from data encapsulation to
data transfer to data decapsulation.
Tunneling provides the following:
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Transition techniques, such as IPv6 over IPv4 tunneling, to interconnect IPv4 and IPv6 networks.
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Virtual private networks (VPNs) for guaranteeing communication security, such as generic routing
encapsulation (GRE) and dynamic virtual private network (DVPN).
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Traffic engineering, such as multiprotocol label switching traffic engineering (MPLS TE), thus
preventing network congestion.
The preceding tunneling technologies require that you create virtual Layer 3 interfaces (tunnel
interfaces) at both ends of a tunnel, so that devices at both ends can send, identify, and process packets
transferred through the tunnel.