Extended Buffer-To-Buffer Credits - Cisco MDS 9000 Series Configuration Manual

Extended Buffer-to-Buffer Credits

Default
buffer-to-buffer
credit buffers
Maximum
buffer-to-buffer
credit buffers
Note
Cisco MDS 9148S and Cisco MDS 9250i are 16 Gbps line-rate switches.
The following guidelines apply to buffer-to-buffer credit buffers on the 40/48-port 9250i/9148S Fabric switches:
• Buffer-to-buffer credit buffers can be configured from a minimum of 1 buffer to a maximum of 64 buffers
• Buffer-to-buffer credit buffers can be configured from a minimum of 2 buffers to a maximum of 64
• Buffer-to-buffer credit buffers for F or FL port can be configured for a single port in a port group from
• Buffer-to-buffer credit buffers for E or TE port can be configured for a single port in a port group from
Note The ports that are moved to minimum credits need not be licensed.
Extended Buffer-to-Buffer Credits
To facilitate buffer-to-buffer credits for long-haul links, the extended buffer-to-buffer credits feature allows
you to configure the receive buffers above the maximum value on all 4-Gbps, 8-Gbps, advanced 8-Gbps,
16-Gbps, and 32-Gbps switching modules. When necessary, you can reduce the buffers on one port and assign
them to another port, exceeding the default maximum. The minimum extended buffer-to-buffer credits per
port is 256 and the maximum is 4095.
In general, you can configure any port in a port group to dedicated rate mode. To do this, you must first release
the buffers from the other ports before configuring larger extended buffer-to-buffer credits for a port.
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
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64
253
per port when the ports are in F or FL mode.
buffers per port when the ports are in E or TE mode.
a minimum of 1 buffer to a maximum of 253 buffers when all other ports in a port group are moved to
minimum credits.
a minimum of 2 buffer to a maximum of 253 buffers when all other ports in a port group are moved to
minimum credits.
Configuring Interface Buffers
64
253