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New Member

32-port line card B2B credits

When I setup an E-port on the first of the four ports in a quad , how can I allocate the number of B2B credits from default 12 to a higher number which are not used by the three disabled ports?

New Member

Re: 32-port line card B2B credits

Hi Michal,

The receive BB_credit values depend on the module type and the port mode.

For 32-port switching modules and host-optimized ports, the default value is 12 for Fx, E, and TE modes. These values cannot be changed.

For 16-port switching modules and full rate ports, the default value is 16 for Fx mode and 255 for E or TE modes. The maximum value is 255 in all modes. This value can be changed as required.

Here is an example how to change it:

gislaved(config-if)# switchport fc

fcrxbbcredit fcrxbufsize

gislaved(config-if)# switchport fcrxbbcredit ?

<1-255> Enter receive BB_credit

default Default receive BB_credit

performance-buffers Configure performance buffers for receive BB_credit

gislaved(config-if)# switchport fcrxbbcredit 30 ?

mode Configure receive BB_credit for specific mode

Carriage Return

gislaved(config-if)# switchport fcrxbbcredit 30 mod e?


gislaved(config-if)# switchport fcrxbbcredit 30 mode ?

E Configure receive BB_credit for E or TE mode

Fx Configure receive BB_credit for F or FL mode

For further details, you may want to check out the following URL :



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