Cisco MDS 9000 Series Configuration Manual page 196

Disabling Extended Receiver Ready
Before you begin
You must enable ER_RDY flow-control mode using the system fc flow-control er_rdy command on the
local and adjacent switches, and then flap the ISLs connecting the local and adjacent switches to enable
ER_RDY flow-control mode on the ISLs.
Step 1
Enter configuration mode:
switch# configure terminal
Step 2 Enable ER_RDY flow-control mode:
switch(config)# system fc flow-control er_rdy
Note Enable the ER_RDY flow-control mode on both the connected switches for an existing Inter-Switch Link (ISL)
before proceeding to step 3.
Step 3
Select a Fibre Channel interface and enter interface configuration submode:
switch(config-if)# interface fc slot/port
Step 4 Gracefully shut down the interface and administratively disable traffic flow:
switch(config-if)# shutdown
Step 5
Enable traffic flow on the interface:
switch(config-if)# no shutdown
Step 6 Return to privileged executive mode:
switch(config-if)# end
Step 7
Verify if the link is in ER_RDY flow-control mode:
switch# show flow-control er_rdy
Disabling Extended Receiver Ready
To disable Extended Receiver Ready (ER_RDY) on a switch, perform these steps:
Before you begin
1. Remove the congestion-isolation portguard action for the links in the port-monitor policy. For more
information, see
2. Disable the Congestion Isolation feature. For more information, see
page
Step 1
Enter configuration mode:
switch# configure terminal
Step 2 Disable ER_RDY flow-control mode:
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
178
Configuring the Port-Monitor Portguard Action for Congestion Isolation, on page
179.
Congestion Detection, Avoidance, and Isolation
Enabling Congestion Isolation, on
180.