Cisco AJ732A - MDS 9134 Fabric Switch Release Note page 9

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.
9
inorder delivery: guaranteed,
inorder delivery: not guaranteed,
MDS Multilayer Director & Multilayer Fabric Switches Release Notes
in-order delivery of frames is
in-order delivery of frames is