Release Notes HP C-series FC Switches for NX-OS_5.2(8a)(5697-2659, July 2013)
16 MDS 9000 Series Multilayer Director & Multilayer Fabric Switches Release Notes
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.
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 Fabric Configuration Guide, Cisco DCNM for SAN, Cisco DCNM for SAN, Release 6.x
to enable IOD using Device Manager/DCNM.