> # Dedicated Rate Mode

> When port rate mode is configured as dedicated, a port is allocated required fabric bandwidth and related resources to sustain line rate traffic at the maximum operating speed configured for the port. In this mode, ports do not use local buffering and all receive buffers are allocated from a global buffer pool (see the "Buffer Pools" topic).

> Table 13-4 shows the bandwidth provided by the various port speed configurations on the 8-Gbps Advanced Fibre Channel switching modules.

> Table 13-4 Bandwidth Reserved for the Port Speeds on Generation 4 Switching Modules
> Configured Speed | Reserved Bandwidth
> --- | ---
> Auto | 8 Gbps
> 8-Gbps
> Auto with 4-Gbps maximum | 4 Gbps
> 4-Gbps
> Auto with 2-Gbps maximum | 2 Gbps
> 2-Gbps
> 1-Gbps | 1 Gbps

> Table 13-5 shows the bandwidth provided by the various port speed configurations on the 8-Gbps Fibre Channel switching modules.

> Table 13-5 Bandwidth Reserved for the Port Speeds on Generation 3 Switching Modules
> Configured Speed | Reserved Bandwidth
> --- | ---
> Auto | 8 Gbps
> 8-Gbps
> Auto with 4-Gbps maximum | 4 Gbps
> 4-Gbps
> Auto with 2-Gbps maximum | 2 Gbps
> 2-Gbps
> 1-Gbps | 1 Gbps

> Table 13-6 shows the amount of bandwidth reserved for a configured port speed on 4-Gbps switching modules.

> Table 13-6 Bandwidth Reserved for the Port Speeds on Generation 2 Switching Modules
> Configured Speed | Reserved Bandwidth
> --- | ---
> Auto | 4 Gbps
> 4-Gbps
> Auto with 2-Gbps maximum | 2 Gbps
> 2-Gbps
> 1-Gbps | 1 Gbps

> Note The 4-Port 10-Gbps Fibre Channel module ports in auto mode only support auto speed mode at 10 Gbps.

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