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Fabric OS Administrator’s Guide
53-1002446-01
Frame order delivery
4
Frame order delivery
The order of delivery of frames is maintained within a switch and determined by the routing policy
in effect. The frame delivery behaviors for each routing policy are:
•
Port-based routing
All frames received on an incoming port destined for a destination domain are guaranteed to
exit the switch in the same order in which they were received.
•
Exchange-based routing
All frames received on an incoming port for a given exchange are guaranteed to exit the switch
in the same order in which they were received. Because different paths are chosen for
different exchanges, this policy does not maintain the order of frames across exchanges.
If even one switch in the fabric delivers out-of-order exchanges, then exchanges are delivered to the
target out of order, regardless of the policy configured on other switches in the fabric.
NOTE
Some devices do not tolerate out-of-order exchanges; in such cases, use the port-based routing
policy.
In a stable fabric, frames are always delivered in order, even when the traffic between switches is
shared among multiple paths. However, when topology changes occur in the fabric (for example, if
a link goes down), traffic is rerouted around the failure, and some frames could be delivered out of
order. Most destination devices tolerate out-of-order delivery, but some do not.
By default, out-of-order frame-based delivery is allowed to minimize the number of frames dropped.
Enabling in-order delivery (IOD) guarantees that frames are either delivered in order or dropped.
You should only force in-order frame delivery across topology changes if the fabric contains
destination devices that cannot tolerate occasional out-of-order frame delivery.
Forcing in-order frame delivery across topology changes
1. Connect to the switch and log in using an account with admin permissions.
2. Enter the iodSet command.
NOTE
The iodSet command can cause a delay in the establishment of a new path when a topology
change occurs; use it with care.
3. Confirm the in-order delivery has been set by entering the iodShow command.
Restoring out-of-order frame delivery across topology changes
1. Connect to the switch and log in using an account with admin permissions.
2. Enter the iodReset command.
Содержание Fabric OS v7.0.1
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Страница 100: ...62 Fabric OS Administrator s Guide 53 1002446 01 Configuring FLOGI time handling of duplicate PWWN 3 ...
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Страница 228: ...190 Fabric OS Administrator s Guide 53 1002446 01 Brocade configuration form 8 ...
Страница 248: ...210 Fabric OS Administrator s Guide 53 1002446 01 Validating a firmware download 9 ...
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Страница 430: ...392 Fabric OS Administrator s Guide 53 1002446 01 Ports on Demand 18 ...
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Страница 544: ...506 Fabric OS Administrator s Guide 53 1002446 01 Displaying the range of output ports connected to xlate domains 24 ...
Страница 554: ...516 Fabric OS Administrator s Guide 53 1002446 01 Fabric configurations for interconnectivity A ...
Страница 572: ...534 Fabric OS Administrator s Guide 53 1002446 01 Hexadecimal overview D ...
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