
• Similar to basic switching, except…
– … sender can utilize multiple LIDs associated to the same
destination port
• Packets sent to one DLID take a fixed path
• Different packets can be sent using different DLIDs
• Each DLID can have a different path (switch can be configured
differently for each DLID)
• Can cause out-of-order arrival of packets
– IB uses a simplistic approach:
• If packets in one connection arrive out-of-order, they are dropped
– Easier to use different DLIDs for different connections
• This is what most high-level libraries using IB do!
CCGrid '11
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