> # Configuring Buffer Credits on a Generation 2, Generation 3 or Generation 4 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.

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