Table of Contents
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RUGGEDCOM ROX II
CLI User Guide
Tunneling and VPNs
This chapter describes how to configure various tunnels and Virtual Private Networks (VPNs).
CONTENTS
•
Section 12.1, "Managing Virtual Switches"
•
Section 12.2, "Managing the Layer2 Tunnel Daemon"
•
Section 12.3, "Managing L2TP Tunnels"
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Section 12.4, "Managing L2TPv3 Tunnels"
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Section 12.5, "Managing GOOSE Tunnels"
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Section 12.6, "Managing Generic Tunnels"
•
Section 12.7, "Managing Generic Routing Encapsulation Tunnels"
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Section 12.8, "Managing IPsec Tunnels"
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Section 12.9, "Managing 6in4 and 4in6 Tunnels"
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Section 12.10, "Managing DMVPN"
Section 12.1
Managing Virtual Switches
Virtual switches bridge different network segments together in a way that is independent of any particular
protocol.
Network traffic between segments is forwarded regardless of the IP and MAC addresses defined in the packet.
In a virtual switch, forwarding is done in Layer 2 and allows all network traffic, including Layer 2 Multicast (i.e.
GOOSE, ISO), IP Multicast, Unicast and Broadcast messages, to travel through the virtual switch tunnel without
any modifications.
A virtual switch can be useful, in particular, for GOOSE messaging when the sender and receiver need to
communicate through a routable IP network. Since there is no IP encapsulation for the Layer 2 traffic going
through the virtual switch, network latency is minimized for the traffic between end devices.
The virtual switch appears on the device as a virtual Ethernet interface over a physical interface (i.e. T1/E1 HDLC-
ETH or Ethernet port) between two routers. Physically, the two routers can be in different locations.
There can be multiple virtual switch instances in a router. Each instance can include two or more interfaces, but an
interface can only be a member of one virtual switch instance.
NOTE
There can be multiple virtual switch interfaces over a T1/E1 HDLC-ETH interface, in which the virtual
switch interfaces are separated by creating a VLAN over the T1/E1 HDLC-ETH interface.
Managing Virtual Switches
Chapter 12
Tunneling and VPNs
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