Fabric OS Administrator's Guide v7.0.0 (53-1002148-02, June 2011)

80 Fabric OS Administrator’s Guide
53-1002148-02
Forward error correction
4
Forward error correction
Forward error correction (FEC) provides method error control during data transmission by sending
redundant data to ensure error-free transmission on a specified port or port range. If the ports are
already in the requested configuration, no action is taken. If a range of ports is specified, some of
which are already in the requested configuration, a notification is generated, and no action is taken
for those ports only. All other ports in the specified range are updated. Use the portCfgFec
command, as described in the Fabric OS Command Reference. Execution of this command is
non-disruptive.
If the FEC flag is already enabled on the ports, this command takes no action. If a range of ports is
specified, some of which are already in the requested configuration, a notification is generated,
and no action is taken for those ports only. All other ports in the specified range are updated.
Execution of this command is non-disruptive.
NOTE
FEC is a criteria for a port trunk, but it configurable only on the Brocade DCX 8510-8, 6510-4,
CR16-8, and CR16-4.
FEC does not require handshaking between the source and the destination, it can be used for
broadcasting data to many destinations simultaneously from a single source. In the simplest form
of FEC, each character is sent twice. The receiver checks both instances of each character for
adherence to the protocol being used. If conformity occurs in both instances, the character is
accepted. If conformity occurs in one instance and not in the other, the character that conforms to
the protocol is accepted. If conformity does not occur in either instance, the character is rejected
and a blank space or an underscore (_) is displayed in its place.
To enable the FEC feature on a single port and to display the configuration, perform the following
commands.
switch:admin>portcfgfec --enable 1
switch:admin>portcfgfec --show 1
Forward Error Correction capable: ON
Forward Error Correction configured: ON
To enable the FEC feature on a port, on which this feature is already enabled, perform the following
command.
switch:admin>portcfgfec --enable 8
Same configuration for port 8
To enable the FEC feature on a port range, perform the following command. Any ports in the range
that were enabled by previous commands remain enabled.
switch:admin>portcfgfec --enable 0-8
To disable the FEC feature on a port range, perform the following command.
switch:admin>portcfgfec --enable 0-8
Frame Redirection
Frame Redirection provides a means to redirect traffic flow between a host and a target that use
virtualization and encryption applications, such as the Brocade SAS blade and Brocade Data
Migration Manager (DMM), so that those applications can perform without having to reconfigure
the host and target. You can use this feature if the hosts and targets are not directly attached.