HP AA979A - StorageWorks SAN Switch 2/8V, Administrator'S Manual, Page: 349 / 465

Fabric OS 5.3.0 administrator guide 361
4. Repeat step 3 for the remote extended ISL port. Both the local and remote extended ISL ports must be
configured to the same distance level. When the connection is initiated, the fabric will reconfigure.
The following example configures slot 1, port 1 for the LD link distance mode, enables the extended link
initialization sequence, and sets the desired distance to 50 kilometers:
switch:admin> portcfglongdistance 1/1 LD 1 50
desired_distance Specify the desired distance, in kilometers, for the link.
desired_distance is a required parameter to configure a port as an
LD and LS-mode link. For an LD-mode link, the desired distance is
used as the upper limit of the link distance to calculate buffer
availability for other ports in the same port group. When the
measured distance is more than desired_distance, the
desired_distance is used to allocate the buffers. In this case, the
port operates in degraded mode instead being disabled due to
insufficient buffers. For an LS-mode link, the actual distance is not
measured, instead the desired_distance is used to calculate the
buffers required for the port.
The specified value is the upper limit for calculating buffer
availability for the port. If the measured distance is more than the
specified desired_distance, the port is allocated the number of
buffers required by the specified desired distance. (Fabric OS
versions earlier than v4.4.0 do not support this parameter.)
Note: For 4/256 SAN Director with FC4-16, FC4-16IP, FC4-32, or
FC4-48 port blades, ports will be shown as buffer limited.