HP StorageWorks C-Series Fabric Switches for SAN-OS Release 3.2(1a) and FabricWare 2.1.(3) Release Notes (AA-RWEHH-TE, November 2007)

7 MDS Multilayer Director & Multilayer Fabric Switches Release Notes
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
inorder delivery: guaranteed, in-order delivery of
frames is enabled and no other steps are required
• If the display shows
inorder delivery: not guaranteed, in-order delivery of
frames is 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.
Refer to the Cisco MDS 9000 Family Fabric Manager Switch Configuration Guide to
enable IOD using Device/Fabric Manager.