User manual

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McDATA Sphereon™ 4500 Fabric Switch Product Manager User Manual

Optional Features

Set the Congestion Threshold using one of these methods:

• Click the check box under the Use Algorithmic Threshold

column to display a value under the Threshold % column. This

value is computed by the feature’s rerouting algorithm. If you

click this check box, you cannot enter a value into the

Threshold % column for the port.

If you click the check box to remove the check, any value that

was set in the Threshold % column for the port will redisplay.

• Click in the Threshold % column and enter a value in the range

of 1 through 99.

NOTE: You must either specify a value in the Threshold % column or

select the Use Algorithmic Threshold checkbox.

4. Set Event Notification options. Note that, if enabled, these

notifications occur the first time the events occur. Notifications

are not resent while the problem persists.

• Unresolved Congestion. Click this check box to display a check

and enable notification. If enabled, an “unresolved

congestion” entry is made to the Event Log and an SNMP trap

will be generated, if trap recipients are configured through the

Configure SNMP dialog box.

An unresolved congestion event occurs when the rerouting

algorithm cannot find a path for rerouting data flow and

relieving congestion on an ISL.

• Back Pressure. Click this check box to display a check and

enable this option. If enabled, a back pressure entry will be

made to the Event Log and an SNMP trap will be generated if

trap recipients are configured through the Configure SNMP

dialog box.

A back pressure event occurs when the percentage of time the

ISL lacks BB_Credits exceeds the threshold. A separate event

also occurs when the backpressure condition ends.