Lossless Networkwide In-Order Delivery Guarantee
The Cisco MDS switch architecture guarantees that frames can never be reordered within a switch. This guarantee extends across an entire multiswitch fabric, provided the fabric is stable and no topology changes are occurring.
Unfortunately, when a topology change occurs (for example, a link failure occurs), frames might be delivered out of order. Reordering of frames can occur when routing changes are instantiated, shifting traffic from what might have been a congested link to one that is no longer congested. In this case, newer frames transmitted down a new non-congested path might pass older frames queued in the previous congested path.
To protect against this, all Fibre Channel switch vendors ...
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