Reference (Supporting Fabric OS v7.3.0) Owner manual

160 Fabric OS Command Reference
53-1003131-01
configure
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Note that the R_A_TOV, E_D_TOV, WAN_TOV, and MAX_HOPS configuration
parameters are interrelated. Assigning a specific value to one or more of these
parameters can change the range of allowed values that can be assigned to the
other parameters. As a result, you may not be able to set all the values within the
range displayed against each parameter. To reduce problems, the configuration
utility validates the modified parameter values and prompts you to re-enter some
values, if the validation check fails.
Data Field Size
The data field size specifies the largest possible value, in bytes, for the size of a
type 1 (data) frame. The switch advertises this value to other switches in the fabric
during construction of the fabric as well as to other devices when they connect to
the fabric. Setting this parameter to a value smaller than 2112 might result in
decreased performance.
Sequence-Level Switching
When sequence-level switching is set to 1, frames of the same sequence from a
particular source are transmitted as a group. When this feature is set to 0, frames
are transmitted interleaved among multiple sequences.
Under normal conditions, sequence-level switching should be disabled for better
performance. However, some host adapters have performance issues when
receiving interleaved frames from multiple sequences. When there are such
devices attached to the fabric, sequence-level switching should be enabled.
Disable Device Probing
When disable device probing is set to 1, devices that do not register with the
Name Server will not be present in the Name Server data base. Set this mode
only if the switch's N_Port discovery process (PLOGI, PRLI, INQUIRY) causes an
attached device to fail.
Suppress Class F Traffic
By default, the switch can send Class F frames. When this option is turned on,
Class F traffic is converted to Class 2 traffic before being transmitted.
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 100 km 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.
An Extended Fabrics license is required to set this mode.
BB Credit
The buffer-to-buffer (BB) credit represents the number of buffers available to
attached devices for frame receipt. The range of allowed values varies depending
on other system settings (see Unicast-only Operation). Refer to the Fabric OS
Administrator's Guide for more information on platform-specific BB Credit
limitations.
Insistent Domain ID Mode
When this mode is set, the switch attempts to acquire from the fabric the domain
number programmed in its "Switch Fabric Settings." If the operation fails, the
switch will segment from the fabric. You must disable the switch before configuring
this parameter.