Brocade Communications Systems 8 Command Reference Manual page 691

Operands This command has the following operands:
slot
port
distance_level
vc_translation_link_init
desired_distance
Fabric OS Command Reference
53-1001764-02
Specify the slot number (for bladed systems only), followed by a slash (/).
Specify the number of the port to be configured relative to its slot for bladed
systems. Use switchShow to display a list of valid ports. This operand is
required.
Specify the long distance level as one of the following (the numerical value
representing each distance_level is shown in parentheses):
L0 (0) Specify L0 to configure the port as a regular port. A total of 20 full-size frame
buffers are reserved for data traffic, regardless of the port's operating speed;
therefore, the maximum supported link distance is up to 10 km at 1 Gbps, up
to 5 km at 2 Gbps, up to 2 km at 4 Gbps and up to 1 km at 8 Gbps.
LE (3) Specify LE mode to configure an E_Ports distance greater than 5 km and up
to 10 km. A total of 5, 10, 20, or 40 full-size frame buffers are reserved for
data traffic at port speeds of 1 Gbps, 2 Gbps, 4 Gbps, or 8 Gbps. LE does not
require an Extended Fabrics license.
LD (5) Specify LD for automatic long-distance configuration. The buffer credits for
the given E_Port are automatically configured based on the actual link
distance. Up to a total of 1452 full-size frame buffers are reserved depending
on the distance measured during E_Port initialization. Fabric OS v6.1.0 or
later supports up to 3000 km at 1 Gbps, up to 1500 km at 2 Gbps, and up to
750 km at 4 Gbps and 8 Gbps on certain platforms. If a value for
desired_distance is specified, it is used as the upper limit to the measured
distance.
LS (6) Specify LS mode to configure a static long distance link with a fixed buffer
allocation greater than 10 km. Up to a total of 1452 full-size frame buffers
are reserved for data traffic, depending on the specified desired_distance
value.
On switches running Fabric OS v6.2.0 or later, this parameter specifies the fill
words used on long distance links. When set to 1, the link uses ARB fill words
(default). When set to 0, the link uses IDLE fill words. The IDLE fill word option
is not compatible with QoS configured links and Credit Recovery enabled
links. You must disable these features before configuring long distance IDLE
fill words.
On switches running firmware versions earlier than Fabric OS v6.2.0, this
parameter controls the long distance link initialization sequence. Specify 1 to
activate the long distance link initialization sequence. Specify 0 to deactivate
this mode. This operand is optional. When the command is run without
specifying a value, 1 is assigned automatically for a long distance link in
VC_RDY flow control. Otherwise, 0 is assigned. For a long-distance link not
configured for ISL R_RDY mode, this parameter must be set to 1; otherwise, it
must be reset to 0.
This parameter is required when a port is configured as an LD or an LS mode
link. In LD mode, the value of desired_distance is the upper limit of the link
distance and is used to calculate buffer availability for other ports in the
same port group. When the measured distance exceeds the value of
portCfgLongDistance
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