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6 – Managing Ports
Configuring Ports
59048-02 A 6-13
Q
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 choose the OK button.
5. Connect the switches.
6.2.5
I/O Stream Guard
The I/O Stream Guard feature suppresses the generation of Registered State
Control Notification (RSCN) messages on a port basis. Choose Enable in the Port
Properties dialog to suppress the generation of RSCN messages for the selected
port.
6.2.6
Scan Device
The Device Scan feature queries the connected device during login for FC-4
descriptor information. Disable this parameter only if the scan creates a conflict
with the connected device.
6.2.7
Extending Port Credits
Each port is supported by a data buffer with a 12 credit capacity; that is, 12
maximum sized frames. For fiber optic cables, this enables full bandwidth service
over a distance of 20 kilometers at 1 Gbps (0.6 credits/Km), or 10 kilometers at 2
Gbps (1.2 credits/Km). Longer distances can be spanned at full bandwidth by
borrowing credits from designated donor ports thus pooling the buffer capacities.
This is called credit extension. Each donor port contributes 11 credits to the pool
from which the recipient ports can draw. For example, one donor port contributes
11 credits to the pool from which a recipient draws for a total of 23 credits (11+12).
This provides approximately 38 Km at 1 Gbps (23÷0.6) or 19 Km at 2 Gbps
(23÷1.2).
To extend credits, open the Port menu and select Ext Credit Wizard. The
Extended Credit Wizard leads you through the following process to extend credits
based on transmission distance requirements:
1. Extended Distance on SANbox2: Explains the concepts and principles of
extending port credits. Choose Next.
2. Extended Distance Requirements: Specify speed and distance requirements
for each port then choose Next.