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Campus Network Switches -> Switches that allow maximum throughput, wire speed, and possibly PoE, that end users will connect too.
San Switch -> Wire Speed, Wire Speed (Must Have), 1 gig port minimum, 10 Gig ports would be preferred, Jumbo Frame support a must have.
If you are asking about an iscsi San switch, there is no difference, other than the configuration as John points out, particularly regarding frame size.
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thanks so much for the reply guys. But am still confused. If a LAN switch would take forwarding decisions on the basis of mac addresses, that on what criteria does a SAN switch do? Is the SAN switch all about wire speed or are there other advantages too?
Probably, the "SAN switch" forwards FC packets. You shouldn't compare it to ethernet, it's just a completely different forwarding paradigm, with different physical connections. And yes, it may also have ethernet ports.
If you're still interested - google "fibre channel".
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Traditionally, SANs have been supported by Fiber Channel, which offer features not available in "normal" Ethernet switches. The big difference in features is Fiber Channel works to make data transfer between devices predictable where Ethernet is "best effort".
Today there are enhanced Ethernet or Fiber Channel over Ethernet (FCoE) switches that provide Fiber Channel like features using Ethernet media. These enhanced Ethernet switches support standard Ethernet but to take advantage of the enhanced features, the connecting devices must also have enhanced Ethernet support.
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