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All PC nodes at the Utah Emulab cluster have at least four ethernet ports connected to the
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[switch fabric](http://www.emulab.net/doc/docwrapper.php3?docname=topo.html&printable=1). All of the over 2000 ports can be connected in arbitrary ways by
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[experiment switch fabric](http://www.emulab.net/doc/docwrapper.php3?docname=topo.html&printable=1). All of the roughly 500 nodes and over 2000 ports can be connected in arbitrary ways by
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setting up VLANs on the switches via remote configuration tools. The
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current PC and switch topology is shown below. One additional ethernet
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current PC and switch topology is shown in the switch fabric diagram. One additional Ethernet
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port on each PC is connected to the core router, and is the public facing
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interface. Thus each PC has a full duplex 1Gps or 10Gps connection to
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interface. Thus each PC has a full duplex 100Mbps (pc3000) or 1Gps (all others) connection to
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the servers. These connections are for dumping data off of the nodes and
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such, without interfering with the experimental interfaces. The only impact
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on the node is processor and disk use, and bandwidth on the PCI bus.
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