HP StorageWorks Fabric OS 5.0.0 Command Reference Guide (AA-RW1MA-TE, May 2005)

Fabric OS 5.0.0 command reference guide 423
A long-distance link also can be configured to be part of a trunk group (refer to portCfgTrunkPort).
Two or more long-distance links in a port group forms a trunk group when they are configured for the
same speed, the same distance level, and their link distances are nearly equal.
The vc_translation_link_init option is used to enable the long-distance link initialization
sequence.
desired_distance is a required parameter to configure a port as 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 allocates buffers. In this case, the port operates in degraded mode instead being
disabled due to insufficient buffers.
Pressing Ctrl+D cancels the configuration update.
When a port is configured to be a long-distance port, the output of portShow and switchShow
displays the long-distance level. In the portShow output, the long-distance level is indicated as follows:
• L0 normal
• LE standard <= 10 km
• LM medium long <= 25 km
• L1 long <= 50 km
• L2 super long <= 100 km
• LD auto
In the switchShow output, the long distance mode displays as Lx, where x is the second letter in
two-letter distance-level code described earlier; however, L0.5 mode displays L0.5.
NOTE: The portCfgISLMode and portCfgLongDistance mode cannot both be enabled at the
same time; otherwise, fabric segmentation occurs.
When some of the ports in the switch are configured as long-distance ports, the remaining ports can be
disabled or running in buffer-limited mode due to a lack of frame buffers. Conversely, if a port is
configured as a long-distance port and there are not enough frame buffers remaining, the port does not
initialize.
Operands
This command has the following operands:
slotnumber Specifies the slot number, for bladed systems only. The slot
number must be followed by a slash (/).
portnumber Specifies a port number. Valid values for port number vary,
depending on the switch type. This operand is required.
distance_level Refer to the Description section for information about the
value.
vc_translation_link_ini
t
Specifies the long-distance link-initialization sequence; 1
activates and 0 deactivates this mode. When the command
is run without specifying a value, 1 is assigned automatically
for the long distance link. This operand is optional
desired_distance Refer to the Description section for information about the
value.