# Changing Buffer-to-Buffer Credits

SANbox2 switches negotiate with other switches to resolve differences in the number of port buffer credits. However, certain non-FC-SW-2-compliant switches do not negotiate and will isolate when connected. To remedy this situation, disconnect the switches, then reconfigure the SANbox2 E_Port to match the number of port buffer credits on the other switch.

Note: Changing buffer-to-buffer credits is necessary only for E_Ports that are connected to non-FC-SW-2-compliant switches. Contact your authorized maintenance provider for assistance in using this feature.

To change buffer-to-buffer credits to permit interoperability with non-compliant switches, do the following:

1. Determine the number of credits per port for the non-compliant switch:

* If the credits per port is equal to 12, stop here – no changes are needed.

* If the credits per port is less than 12, proceed to step 2.

* If the credits per port is greater than 12, you must extend credits for the affected SANbox2 port to increase the number of credits to match that of the non-standard switch.

2. Select the SANbox2 switch ports in the faceplate display that are to serve as links to the non-compliant switch.

3. Open the Port menu and select Port Properties.

4. In the E_Port BB Credits field, enter the number of credits per port of the non-compliant switch and click the OK button.

5. Connect the switches.