Administrators Guide (Supporting Fabric OS v7.3.0) Manual

VC number which, if this feature is enabled, is retrieved by indexing the CSCTL value into the table for
each frame entering the fabric.
Irrespective of the type of frame classification method used, the flow priority of a frame is primarily
determined by the VC number used to transmit the frames across the ISL ports. In both methods of
classification, the VC number for a frame is determined at the ingress Fabric port (F_Port) or Fabric
Loop port (FL_Port), when the frame enters the fabric for the very first time. To maintain the same flow
priority for a frame across all the ISL hops in a fabric, the same VC number is used while transmitting
the frame at the egress E_Port until it is out of the fabric thru an F_Port or FL_Port. The main difference
between the QoS zone method of classification and the CSCTL VC-based method of classification is
how the VC number is computed when the frame enters into the fabric thru an F_Port or FL_Port port
and, of course, the manner of setting up these two frame classification methods.
Once the CSCTL mode is enabled on an F_Port or FL_Port in a switch, the CSCTL value in the frame
header of all the incoming frames on that F_Port or FL_Port is used to index into the ASIC’s CSCTL
database table to compute the VC number, which will define the frame’s flow priority throughout its life
in the fabric until it exits out of the fabric thru another F_Port or FL_Port. The QoS links (ISLs) preserve
this classification during the frame’s traversal across all the hops in the fabric.
NOTE
When CSCTL mode and QoS zones are enabled, QoS zones lose priority to CSCTL mode.
Enabling CSCTL mode
1. Select the Port Admin tab.
2. Select View > Advanced mode.
3. Select a port or ports to configure.
4. Select CSCTL > Enable from the Actions list.
Disabling CSCTL mode
1. Select the Port Admin tab.
2. Select View > Advanced mode.
3. Select a port or ports to configure.
4. Select CSCTL > Disable from the Actions list.
Configuring compression and encryption
Encryption provides security for the frames while they are in-flight and compression allows better
bandwidth utilization over long distance. Total bandwidth supported per blade for encryption is 32 Gbps
and compression is 64 Gbps. For a pizza box switch, total bandwidth for encryption and/or compression
is 32 Gbps.
NOTE
Compression and Encryption feature is supported only on 16 Gbps-capable FC platforms and it is not
supported in Access Gateway mode.
Enabling CSCTL mode
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