Release Notes

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36
)Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.0(1a)
OL-21012-01
Limitations and Restrictions
Configuring Buffer Credits on a Generation 2 or Generation 3 Module
When you configure port mode to auto or E on a Generation 2 module, one of the ports will not come
up for the following configuration:
• Port Mode: auto or E for all of the ports
• Rate Mode: dedicated
• Buffer Credits: default value
When you configure port mode to auto or E on a Generation 3 module, one or two of the ports will not
come up for the following configuration:
• Port Mode: auto or E for the first half of the ports, the second half of the ports, or for all of the ports
• Rate Mode: dedicated
• Buffer Credits: default value
When you configure port mode to auto or E for all ports in the global buffer pool, you need to reconfigure
buffer credits on one or more of the ports. The total number of buffer credits configured for all the ports
in the global buffer pool should be reduced by 64.
Features Not Supported on the Cisco MDS 9148 Switch
The Cisco MDS 9148 Multilayer Fabric Switch does not support the following NX-OS features:
• IVR
• Remote Span
• Translative loop support
• FCC - no generation, quench reaction only
• FC-Redirect
In addition, the following features have these limits:
• VSANs - 31 maximum
• SPAN - 1 session maximum
PPRC Not Supported with FCIP Write Acceleration
IBM Peer to Peer Remote Copy (PPRC) is not supported with FCIP Write Acceleration.
Configuring a Persistent FCID in an IVR Configuration with Brocade Switches
The following information is relevant if you have a fabric that consists of Cisco MDS 9000 switches and
Brocade switches, and the Cisco MDS switches are running either NX-OS Release 4.x or Release 5.x
and Brocade is running FOS higher than 6.x. In an IVR configuration, when IVR NAT is enabled on a
Cisco MDS 9000 switch, the device in the native VSAN should be configured with a persistent FCID.
Assuming the FCID is 0xAABBCC, AA should be configured with the virtual IVR domain ID of the
VSAN that contains the ISLs and BB should be configured in the following range: