About Enabling In-Order Delivery - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

Chapter 32 Configuring Fibre Channel Routing Services and Protocols
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
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Frames that cannot be delivered in order through the old path within the switch latency drop period are
dropped. See the

About Enabling In-Order Delivery

You can enable the in-order delivery feature for a specific VSAN or for the entire switch. By default,
in-order delivery is disabled on switches in the Cisco MDS 9000 Family.
We recommend that you only enable this feature when devices that cannot handle any out-of-order
Tip
frames are present in the switch. Load-balancing algorithms within the Cisco MDS 9000 Family ensure
that frames are delivered in order during normal fabric operation. The load-balancing algorithms based
on source FC ID, destination FC ID, and exchange ID are enforced in hardware without any performance
degradation. However, if the fabric encounters a failure and this feature is enabled, the recovery will be
delayed because of an intentional pausing of fabric forwarding to purge the fabric of resident frames that
could potentially be forwarded out-of-order.
OL-17256-03, Cisco MDS NX-OS Release 4.x
The new frames are delivered through the new path after the switch latency drop period has elapsed
and all old frames are flushed.
"Configuring the Drop Latency Time" section on page
Cisco MDS 9000 Family Fabric Manager Configuration Guide
In-Order Delivery
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