Q-Logic 8C/16 Manuel D’Utilisation

5 – Managing Ports
Configuring Ports

5-12

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Q

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.

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. Refer to 

.

F_Port

Fabric port - Supports a single public device (N_Port).

FL_Port

Fabric loop port - Self discovers a single device (N_Port) or a loop of up 
to 126 public devices (NL_Port).

TL_Port

Translated loop port - Supports a loop of up to 124 private target devices 
capable of communicating with up to 63 off-loop initiator devices. Refer to 
the installation guide for your switch for more information about TL_Ports.

G_Port

Generic port - Self discovers as an F_Port or an E_Port.

GL_Port

Generic loop port - Self discovers as an F_Port, FL_Port, or an E_Port. 
GL_Port is the default port mode. A single device on a public loop will 
attempt to configure as an F_Port first, then if that fails, as an FL_Port.

Donor

Donor port - Allows buffer credits to be used by another port.

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.