Brocade Communications Systems Brocade 8/12c Command Reference Manual page 177

R_A_TOV
E_D_TOV
WAN_TOV
MAX_HOPS
Data Field Size
Sequence-Level Switching
Disable Device Probing
Suppress Class F Traffic
Fabric OS Command Reference
53-1001764-01
The resource allocation time out value specified in milliseconds. This variable
works with the variable E_D_TOV to determine switch actions when presented
with an error condition.
Allocated circuit resources with detected errors are not released until the time
value has expired. If the condition is resolved prior to the time out, the internal
time-out clock resets and waits for the next error condition.
Error detect time out value specified in milliseconds. This timer is used to flag a
potential error condition when an expected response is not received within the set
time limit. If the time for an expected response exceeds the set value, then an
error condition occurs.
Wide area network time out value specified in milliseconds. This timer is the
maximum frame time out value for a WAN, if any, interconnecting the Fibre
Channel islands.
Maximum 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 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.
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.
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.
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.
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.
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