Brocade Web Tools Administrator's Guide (53-0000194-01, November 2006)

3-10 Web Tools Administrator’s Guide

Publication Number: 53-0000194-01

Configuring Fabric Parameters

You can configure the following fabric parameters using the Configure tab and Fabric subtab of the

Switch Admin module (as shown in Figure 3-4 on page 3-11):

• BB Credit

The buffer-to-buffer credit is the number of buffers available to attached devices for frame receipt.

The default BB Credit is 16. The range is 1–27.

• R_A_TOV

Resource allocation timeout value (in milliseconds). This variable works with the E_D_TOV to

determine switch actions when presented with an error condition. The default is 10000. The

possible range is 4000–120000.

• E_D_TOV

Error detect timeout value (in milliseconds). This timer is used to flag a potential error condition

when an expected response is not received within the set time. The valid range is 1000–5000.

• Datafield size

The largest possible data field size (in bytes). The valid range is 256–2112.

• Switch PID Format

Select a switch PID format from one of the following:

- Format 1 (0-base, 256 encoding)

- Format 2 (16-base, 256 encoding)

• Sequence Level Switching

Check this box to enable frames of the same sequence from a particular group to be transmitted

together. When this option is not selected, frames are transmitted interleaved among multiple

sequences. Under normal circumstances, sequence-level switching should be disabled for better

performance. However, some host adapters have issues when receiving interleaved frames among

multiple sequences.

• Disable Device Probing

Set this mode only if the switch N_Port discovery process (PLOGI, PRLI, INQUIRY) causes an

attached device to fail. When set, devices that do not register with the Name Server are not present

in the Name Server data base.

• Per-Frame Routing Priority

Choose to select or deselect per-frame routing priority. When enabled, the virtual channel ID is

used in conjunction with a frame header to form the final virtual channel ID.

• Suppress Class F Traffic

Applies only if VC-encoded address mode is also set. When checked, translative addressing (which

allows private devices to communicate with public devices) is disabled.

• Insistent Domain ID Mode

Set this mode to make the current domain ID insistent across reboots, power cycles, and failovers.

This mode is required fabric wide to transmit FICON

data.