> # 18-Port Fibre Channel/4-Port Gigabit Ethernet Multiservice Module BB_Credit Buffers

> Table 14-7 lists the BB_credit buffer allocation for 18-port 4-Gbps multiservice modules.

> Table 14-7 18-Port 4-Gbps Multiservice Module BB_Credit Buffer Allocation
> BB_Credit Buffer Allocation | BB_Credit Buffers Per Port
> --- | ---
> Dedicated Rate Mode 4-Gbps Speed | Shared Rate Mode 4-Gbps Speed
> ISL1 | Fx Port | ISL1 | Fx Port
> Default BB_credit buffers | 250 | 16 | 16 | 16
> Maximum BB_credit buffers | 250 | 250 | 16 | 16
> Total number of BB_credit buffers per module | 4509

> 1ISL = E port or TE port.

> The following considerations apply to BB_credit buffers on18-port 4-Gbps Fibre Channel switching modules:

> - BB_credit buffers for ISL connections can be configured from a minimum of 2 buffers to a maximum of 250 buffers for dedicated rate mode or 16 buffers for shared rate mode.
> - BB_credit buffers for Fx port mode connections can be configured. The minimum is 2 buffers and the maximum of 250 buffers for dedicated rate mode or 16 buffers for shared rate mode.
> - Performance buffers are not supported on this module.

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