Isl-r_rdy, Dy, long – Brocade Network OS Command Reference v4.1.0 User Manual

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Network OS Command Reference

407

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isl-r_rdy

Sets the flow control primitive used to prevent frame drop to ISL R_RDY mode.

Synopsis

isl-r_rdy

no isl-r_rdy

Operands

None

Defaults

no isl-r_rdy or VC_RDY flow control mode.

Command Modes

Interface Fibre Channel configuration mode

Description

Use this command to enable inter switch link receiver ready (ISL R_RDY) flow control mode on a
Fibre Channel port.

This flow control mode can be enabled only for a port configured for long distance operation with
long distance modes LE, LD, or LS.

In ISL R_RDY mode, the port sends the R_RDY 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.

Usage Guidelines

Brocade recommends disabling ISL R_RDY.

This command can be used only on Network OS platforms with Fibre Channel ports
(Brocade VDX 6730-32 and Brocade VDX 6730-76 switches), in Brocade VCS Fabric mode, and
with the FCoE license installed.

A Fibre Channel port configured as a trunk port cannot have the ISL R_RDY flow control enabled.

Enter no isl-r_rdy to disable ISL R_RDY mode on a port, and instead establish VC_RDY flow control.

Examples

To enable ISL R_RDY mode on a port:

switch(config)# interface FibreChannel 7/0/2

switch(conf-FibreChannel-7/0/2)# isl-r_rdy

To disable ISL R_RDY mode on a port:

switch(config)# interface FibreChannel 7/0/2

switch(conf-FibreChannel-7/0/2)# no isl-r_rdy