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support.dell.com PowerVault 56F 16-Port Fibre Channel Switch Commands 4-11
The switch provides the ability to tune the switch in a specific application, by configur-
ing the parameters for the switch's eight virtual channels. Note that the first two
virtual channels are reserved for the switch's internal functions and are not user-
configurable. The default virtual channel settings have already been optimized for
switch performance. Changing the default values, if properly selected, may improve
switch performance somewhat, but may also severely degrade performance.
You should not change these settings without fully understanding the effects of those
changes. Table 4-6 describes the virtual channel parameters.
VC Encoded
Address Mode
When this mode is set, frame source and destination
addresses utilize an address format compatible with
PowerVault 50F.
When this mode is set to
0
, 239 PowerVault 51F switches
may be cascaded.
Disable Transla-
tive Mode
The setting is only relevant if VC Encoded Address Mode is
also set. When set, this mode maintains explicit address
compatibility with first-generation switches. However,
enabling this feature also disables translative/phantom
addressing.
Set this mode only if hardware or software systems are
attached to the fabric which explicitly rely on a specific frame
address format.
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 set, the virtual channel ID is used in
conjunction with a frame header to form the final virtual
channel ID.
(!
%
VC Link
Control
This changes the virtual channel used for N_Port-
generated, Class 2 link control frames (ACKs,
P_BSYs, and P_RJTs).
0
= Force N_Port-generated link control frames
to be sent back using a Class 2 data virtual
channel.
1
= Force N_Port-generated link control frames
to be sent back using a virtual channel normally
reserved for fabric-internal traffic.
0
VC Class 2
Sets the virtual channel used for Class 2 frame
traffic. May be set to virtual channel 2, 3, 4, or 5.
2
(!
%