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IV. Enable In-Order Delivery of Frame

During a steady-state environment, the hardware and software architecture of the C-series

MDS 9000 Family prevents out-of-order (OOO) frame distribution from occurring. If the

fabric encounters a failure, some devices may not be able to handle any OOO frames. For

this reason, HP requires in-order delivery (IOD) be enabled for all switches. There is a

switch setting to enable in-order of frames during fabric failure.

Note: IOD feature is not supported on the MDS 9020.

Using the Management Console or Telnet to Enable IOD

Use the following procedure to enable in-order delivery (IOD) of frames with management

console or telnet:

1. Log into the switch using either the management console or telnet

2. Enter your network-admin privileged account by entering your login name and

password

switch login: admin

Password: <admin password>

3. Enter the following:

switch# show in-order-guarantee

4. The response shows whether or not in-order delivery is enabled



If the display shows

enabled and no other steps are required



If the display shows

disabled; continue to the next step

5. Enter into the configuration mode by entering the following command:

switch# config terminal

6. Enter the following command to set in-order delivery of frames:

switch(config)# in-order-guarantee

switch(config)# exit

7. Enter the following command to verify that in-order delivery is enabled:

switch# show in-order-guarantee

You should see the following response for all VSANs:

inorder delivery: guaranteed

8. Copy the running configuration into the startup configuration by entering the

following:

switch# copy running-config startup-config

Note: The running configuration overwrites the startup configuration.

IOD must be enabled for any additional VSANs created.

inorder delivery: guaranteed,

inorder delivery: not guaranteed,

MDS Multilayer Director & Multilayer Fabric Switches Release Notes

in-order delivery of frames is