User manual

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McDATA Sphereon™ 4500 Fabric Switch Product Manager User Manual

Configuring the Switch

NOTE: Ordinarily, you do not need to change values in this dialog box from

their defaults. The only exception is the Preferred Domain ID. Change this

value if the switch will participate in a multiswitch fabric.

4. Use information under Switch Parameters to change settings as

required for parameters in this dialog box.

5. After you change settings, click the Activate button.

Fabric Parameters

Configure the following parameters as required by your fabric.

R_A_TOV Resource allocation time-out value. This variable is used to time out

operations that depend on the maximum possible time that a frame

can be delayed in a fabric and still be delivered. Adjust the value for

R_A_TOV in tenths of a second (100 ms) increments over a range of

10 tenths (1 second) to 1200 tenths (120 seconds). The default value is

100 tenths (10 seconds).

NOTE: Set the same value for R_A_TOV on all switches on a multiswitch

fabric. If the value is not the same on all units, the fabric segments. Also, the

value for R_A_TOV must be greater than the value configured for E_D_TOV.

E_D_TOV Error-detect time-out value: This defines the time that the switch

waits for an expected response before declaring an error condition.

Configure this value in tenths of a second (100 millisecond)

increments in a range of 2 tenths of a second to 600 tenths (60

seconds). The default value is 20 tenths (2 seconds).

NOTE: Set the same value for E_D_TOV on all switches on a multiswitch

fabric. If the value is not the same, the fabric segments.

Switch Priority Setting this value determines the principal switch for the multiswitch

fabric. Select either Principal (highest priority), Default, or Never

Principal (lowest priority) from the Switch Priority drop-down list.

If all switches are set to Principal or Default, the switch with the

highest priority and the lowest WWN becomes the principal switch.

Following are some examples of principal switch selection when

switches have these settings.

• If you have three switches and set all to Default, the switch with

the lowest WWN become the principal switch.