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Benefits of using multiple interfaces vs VLAN trunk

Moving from a 4200 to a 5600, we've doubled in ethernet ports. This made me wonder, what are the pros/cons of multiple physical interfaces versus a VLAN trunk. Why would I connect, for example, VLAN1, 2, 3 and 4 to eth1, 2, 3 and 4 as opposed to trunking them all on eth1?

I could come up with this, but what am I missing?

  • Theoretical sharing of the 1Gb bandwidth
  • Spreading them over several switches
  • Bonding



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