Dell POWEREDGE M1000E - Manual (Page 188)

160 Fabric OS Command Reference
53-1002746-01
configure
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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.
Disable Default PortName
When this mode is set, the switch does not generate a default port name.
Edge hold time
Configures the maximum time a frame can wait after it is received on the ingress
port and before it is delivered to the egress port. If the frame waits in the egress
buffer for more than the configured hold time, the switch drops the frame,
replenishes sender's credit, and increments the counters sts_tx_timeout and
er_c3_timeout on the TX and RX ports respectively. The frame-timeout indicates a
slow draining or a congestion or bottleneck in the fabric. Decreasing hold time on
the edge switches may reduce frame drop counts in the core switches. This
parameter is stored persistently in the configuration file. You can configure edge
hold time on both default and logical switch.
The edge hold time configuration is a chip-based value and the configuration
varies between Condor2-based platforms and Condor3-based platforms.
Condor2-based platform provides one register to store the edge hold time value
and any change in this value will affect all ports in the chip. Therefore, the edge
hold time configuration will not be changed for Condor2-based platform ports in a
logical switch. The Condor2-based platform ports in a logical switch take the
default edge hold time value (220 milliseconds) or the value configured in the
default switch. Condor3-based platform provides four registers to store the edge
hold time configuration and therefore each port in a chip can be configured one of
the four values.
The edge hold time parameter is enabled by default with a value of 500
milliseconds. The following are the three predefined edge hold time values:
80
Low edge hold time (in milliseconds).
220
Medium edge hold time (in milliseconds).
500
High edge hold time (in milliseconds). This is the default value.