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Chapter 2: Installation tasks
A backpressure event occurs when the percent time an ISL has
low BB_Credit exceeds the low BB_Credit threshold.
d. The low BB_Credit threshold is the percent time an ISL is
allowed to not transmit data because BB_Credit is unavailable.
When the threshold is exceeded, data is rerouted to another
ISL. In addition, traffic cannot be rerouted to another low-
threshold ISL. Use one of the following to set the low
BB_Credit threshold:
• Click the Default check box. A check mark appears in the
box and a calculated default value appears (1% to 99%) in
the Low BB_Credit Threshold field. If the default value is
enabled, a value cannot be entered in the Low BB_Credit
Threshold field.
• Ensure the Default check box is blank. At the Low BB_Credit
Threshold field, type a percentage value from 1% to 99%.
NOTE:
The default low BB_Credit threshold is calculated by the
switch’s firmware and performs well in most cases.
2. For each switch port:
a. Click the check box in the Default Threshold % column. A check
mark appears in the box and a calculated default value
appears (1% to 99%) in the associated field in the Threshold %
column. If the default value is enabled, a value cannot be
entered in the Threshold % column.
b. Ensure the check box in the Default Threshold % column is
blank. At the associated field in the Threshold % column, type a
percentage value from 1% to 99%.
NOTE:
The default low BB_Credit threshold is calculated by the
switch’s firmware and performs well in most cases.
3. Click Activate to save the information. The message Your changes
to the port binding configuration have been successfully
activated
appears.
4. If additional optional features are to be installed, go to
Install PFE
Keys (Optional)
on page 184. If no PFE keys are to be installed, go
to
Task 26: Cable Fibre Channel Ports
on page 186.
Summary of Contents for SAN32M1
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