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5 – Managing Ports
Configuring Ports
59022-04 B 5-11
5.2.4
Changing TL Modes
You can configure a TL_Port to support a loop of private target devices or a loop
of private initiator devices.
■ For a loop of up to 124 private target devices, choose the TL Target radio
button. This enables up to 63 initiator devices anywhere in the fabric to
automatically connect with the private devices on the TL_Port. Group the
TL_Port and up to 63 initiators in the same soft or ACL zone using worldwide
name or domain ID and port ID membership to limit the number of possible
initiators to 63.
■ For a loop of up to 125 private initiator devices, choose the TL Initiator radio
button. This enables the private initiators on the TL_Port to automatically
connect to up to 64 target and initiator devices in the same soft or ACL zone.
You must group the TL_Port and the target devices in the same soft or ACL
zone using worldwide name or domain ID and port ID membership. If there
are more than 65 members in the zone, the TL_Port will be unable to
communicate with the fabric.
5.2.5
Changing Buffer-to-Buffer Credits
Each port has a receive buffer capacity of 12 Fibre Channel frames or credits
which is equal to approximately 24K bytes. Port buffer credits can be changed on
ports to allow connections to non-QLogic switches that have different port buffer
capacities. To change port buffer credits, do the following:
1. Select one or more ports in the faceplate display.
2. Open the Port menu and select Port Properties.
3. In the E_Port BB Credits field, enter the new number in the range from
0–255.
4. Choose the OK button to write the new buffer-to-buffer setting to the switch.
5.2.6
I/O Stream Guard
The I/O Stream Guard feature suppresses Registered State Control Notification
(RSCN) messages on a port basis.
5.2.7
Extending Port Credits
Each port is supported by a data buffer with a 12 credit capacity; that is, 12
maximum sized frames. For fibre 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.