Brocade OS Command Reference Manual Supporting Fabric OS v6.0.0 (53-1000599-01, October 2007)

88 Fabric OS Command Reference
53-1000599-01
configure
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WAN_TOV Wide area network time out value (WAN_TOV) displays in milliseconds. This
timer is the maximum frame time out value for a WAN, if any, interconnecting
the Fibre Channel islands.
MAX_HOPS Maximum hops (MAX_HOPS) is an integer that denotes the upper limit on the
number of hops a frame might have to traverse to reach any destination port
from any source port across the fabric.
Note that the The R_A_TOV, E_D_TOV, WAN_TOV, and MAX_HOPS
configuration parameters are inter-related. 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, the user might 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 the user 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 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.
A Brocade Extended Fabrics license is required to set this mode.