Specifications

Fabric OS Commands
154 Fabric OS Version 3.1.x/4.1.x Reference Guide
Virtual Channel Settings
The switch enables fine tuning for a specific application, by configuring the
parameters for eight virtual channels. The first two virtual channels are reserved
for switch internal functions and are not available for modification.
The default virtual channel settings have already been optimized for switch
performance. Changing the default values can improve switch performance, but
can also degrade performance. Do not change these settings without fully
understanding the effects of the changes.
The Virtual Channel Setting fields are as follows:
:A description of the Virtual Channel Setting field follows:
Core Switch PID
Format (V3.1.x only)
This is used to set the 256 port PID format that is used for
core switches. This option enables single Domain port
density higher than 16. VC Encoded Address Mode and
Core Switch PID Format are mutually exclusive. They
cannot both be enabled at the same time. All switches in
the fabric must have this parameter set the same.
Per-frame Route
Priority
In addition to the eight virtual channels used in frame
routing priority, support is also available for per-frame
based prioritization when this value is set. When
Per-frame Route Priority is set to 1, the virtual channel ID is
used in conjunction with a frame header to form the final
virtual channel ID.
Long Distance Fabric When this mode is set to 1, ISLs in a fabric can be up to
100Km long. The exact distance level is determined by the
per-port configuration on the E_Ports of each ISL. Both
E_Ports in an ISL must be configured to run the same long
distance level, otherwise, the fabric will be segmented. The
Extended Fabric License is required to set this mode.
Table 3: Configure Command Virtual Channel Settings
Field Default Range
VC Priority 2 22 to 3
VC Priority 3 22 to 3
VC Priority 4 22 to 3
VC Priority 5 22 to 3
VC Priority 6 32 to 3
VC Priority 7 32 to 3