Reference Guide

2_parity_err: 0 Ols_out: 0
CMI_bus_err: 0
Enabling long distance when connecting to TDM devices
Use this procedure when connecting to time-division multiplexing (TDM) devices and your Brocade switch has QoS and buffer credit
recovery enabled.
1. Connect to the switch and log in using an account assigned to the admin role.
2. Disable QoS.
switch:admin> portcfgqos --disable[slot/]port
If you do not disable QoS, after the second or third link reset (LR), ARB fill words display. Refer to the
Fabric OS Command
Reference for more for more information on setting fill words.
3. Disable buffer credit recovery. Buffer credit recovery is not compatible with the IDLE mode. If you do not disable buffer credit
recovery, it continues to perform a link reset.
switch:admin> portcfgcreditrecovery --disable [slot/]port
4. Configure the port to support long-distance links.
switch:admin> portcfglongdistance [slot/]port,LS,0,-distance 100
Forward error correction on long-distance links
Forward error correction (FEC) on user ports is supported for LD and LS long-distance modes. Use the portCfgLongDistance
command with the -fecEnable or -fecDisable options to enable or disable FEC, respectively, on a user port. Alternatively, you can use
the portCfgFec command with the --enable or --disable option as you would for any regular port.
For additional details about FEC, refer to Forward error correction on page 103.
Enabling FEC on a long-distance link
1. Connect to the switch and log in using an account assigned to the admin role.
2. Enter the portCfgLongDistance command and include the -fecEnable option, or issue the portCfgFec command with the --
enable option.
3. Enter the portCfgFec --show command to verify the configuration.
switch:admin> portcfglongdistance 1/20 LS 1 -distance 122 -fecenable
FEC has been enabled.
Reserved Buffers = 982
Warning: port (132) may be reserving more credits depending on port speed.
switch:admin> portcfgfec --show 1/20
Port: 20
FEC Capable: YES
10G/16G FEC Configured: ON
16G FEC via TTS Configured: OFF
FEC State: Inactive
Disabling FEC on a long-distance link
1. Connect to the switch and log in using an account assigned to the admin role.
Managing Long-Distance Fabrics
Brocade Fabric OS Administration Guide, 8.0.1
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