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README
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VDEv2: Virtual Distributed Ethernet.
(c) 2003/2004/2005/2006 Renzo Davoli
Long long time ago based on uml-router Copyright 2002 Yon Uriarte and Jeff Dike
qemu-vde-HOWTO is (c) by Jim Brown
Notice: Virtual Distributed Ethernet is not related in any way with
www.vde.com ("Verband der Elektrotechnik, Elektronik und Informationstechnik"
i.e. the German "Association for Electrical, Electronic & Information
Technologies").
Components of the VDE architecture:
- VDE switches: virtual counterpart of ethernet switches.
- VDE cables: virtual counterpart of a crossed-cable used to connect two switches.
- VDE 2 includes:
- switch management both from console and from a "unix socket terminal"
- VLAN 801.1q *almost* compatible
- FSTP (fast spanning tree) already incomplete and currently not tested for 802.1d/w/s
compatibility. under development. (vde_switch must be compiled with the FSTP flag on)
Using VDE:
- All units connected to the VDE see each other as they were on a real ethernet.
- A real Linux box can be connected to the VDE using a tap interface (TUNTAP)
(packets can be further routed using standard linux methods).
- It is possible to join two VDE switches -- also running on different
real conputers -- using virtual VDE cables
- UML (user-mode-linux) virtual machines can be connected to the VDE
- MPS (MIPS emulated machines (c) Morsiani/Davoli) can be connected
to the virtual VDE.
Examples of VDE uses:
- With VDE it is possible to create a virtual network of UML machines running
on several real computer
- VDE can be used to create tunnels (even crossing masquerated networks)
- VDE can provide mobility support. Changing a VDE cable with another does not
affect the communications in place. The new VDE cable can use a completely
different path on the real net. VDE supports also multiple concurrent VDE cables
between a pair of VDE-switches during the hand-off. This eliminates when possible
hich-ups of com