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32-15
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 32 Configuring Fibre Channel Routing Services and Protocols
In-Order Delivery
Figure 32-12 Multicast Root Configuration
Step 3 Set the Config Mode drop-down menu to lowestDomainSwitch.
Step 4 Click Apply Changes to save these changes, or click Undo Changes to discard any unsaved changes.
In-Order Delivery
In-Order Delivery (IOD) of data frames guarantees frame delivery to a destination in the same order that
they were sent by the originator.
Some Fibre Channel protocols or applications cannot handle out-of-order frame delivery. In these cases,
switches in the Cisco MDS 9000 Family preserve frame ordering in the frame flow. The source ID (SID),
destination ID (DID), and optionally the originator exchange ID (OX ID) identify the flow of the frame.
On any given switch with IOD enabled, all frames received by a specific ingress port and destined to a
certain egress port are always delivered in the same order in which they were received.
Use IOD only if your environment cannot support out-of-order frame delivery.
Tip If you enable the in-order delivery feature, the graceful shutdown feature is not implemented.
This section includes the following topics:
• About Reordering Network Frames, page 32-15
• About Reordering PortChannel Frames, page 32-16
• About Enabling In-Order Delivery, page 32-17
• Enabling In-Order Delivery Globally, page 32-18
• Enabling In-Order Delivery for a VSAN, page 32-18
• Configuring the Drop Latency Time, page 32-18
About Reordering Network Frames
When you experience a route change in the network, the new selected path may be faster or less
congested than the old route.
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