Reference Guide

Brocade Fabric OS Command Reference 693

53-1004112-02

portCfgISLMode

Enables or disables ISL R_RDY mode on a port.

Synopsis portcfgislmode [slot/]port,mode

Description Use this command to enable or disable interswitch link read-ready (ISL R_RDY) mode on a port. Use the

portCfgShow command to determine whether ISL R_RDY mode is enabled on a port.

In ISL R_RDY mode, the port sends a primitive signal that the port is ready to receive frames. The port sends an

exchange link parameter (ELP) with flow control mode 02. If a port is ISL R_RDY enabled, it can only receive an

ELP with flow control mode 02. A received ELP with flow control mode 01 will segment the fabric.

This mode cannot detect any inconsistencies in fabric operating mode parameters, such as the PID format of

connected ports. Before enabling ISL R_RDY mode, ensure that all fabric-wide parameters are consistent for

every switch in the fabric.

Use configShow fabric.ops to view a complete listing of fabric operating mode parameters on the switch.

The following E_Port configurations are not applicable to a port configured for ISL R_RDY mode. If configured,

these port configuration parameters are ignored during E_Port initialization:

• Trunk port

• VC link init

The portCfgISLMode and portCfgLongDistance levels LE, LD, or LS only can be enabled at the same time. Such

an ISL uses R_RDY mode of flow control over the long distance link. This feature is not backward compatible with

firmware versions that do not support it.

Notes Changes made by portCfgISLMode are persistent across switch reboots and power cycles.

This configuration can be cleared but not set on VE/VEX_Ports.

The execution of this command is subject to Virtual Fabric restrictions that may be in place. Refer to "Using Fabric

OS Commands" and "Command Availability" for details.

The Fabric OS port configuration commands are not supported on FCoE ports.

Operands This command has the following operands:

slot

For bladed systems only, specify the slot number of the port to display, followed by a slash

(/).

port

Specify the port to display, relative to its slot for bladed systems. Use switchShow to list

valid ports.

mode

Specify 1 to enable ISL R_RDY mode. Specify 0 to disable ISL R_RDY mode.