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

422 Fabric OS commands
Configures a port to support long-distance links.
Synopsis
portcfglongdistance [slotnumber/]portnumber [ distance_level]
[vc_translation_link_init] [desired_distance]
Availability
admin
NOTE: This command requires an HP Extended Fabrics license.
Description
Use this command to allocate enough full-size frame buffers on a particular port to support a long-distance
link up to 500 km. The port can only be used as an E_Port. Changes made by this command are persistent
across switch reboots or power cycles.
The value of distance_level can be one of the following (the numerical value representing each
distance_level is shown in parentheses):
Depending on the switch platform and the availability of frame buffers within the port group, the LD mode
link can operate up to distances of 500 km at 1 Gb/s, 250 km at 2 Gb/s, or 125 km at 4 Gb/s. On
some older switch platforms, the LD mode link can operate up to distances of 200 km at 1 Gb/s or 100
km at 2 Gb/s.
portCfgLongDistance
L0 (0) Reconfigure the port to be a regular switch 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 10 km, 5 km, or 2.5 km for the
port speeds of 1 Gb/s, 2 Gb/s, or 4 Gb/s, respectively.
L0.5 Level 0.5 (portCfgShow displays the two-letter code as LM) long distance, up to
25 km. A total of 12, 25, or 50 full-size frame buffers are reserved for the port at
speeds of 1 Gb/s, 2 Gb/s, or 4 Gb/s, respectively.
L1 (1) Level 1 long distance, up to 50 km. A total of 25, 50, or 100 full-size frame
buffers are reserved for the port at speeds of 1 Gb/s, 2 Gb/s, or 4 Gb/s,
respectively.
L2 (2) Level 2 long distance, up to 100 km. A total of 50, 100, or 200 full-size frame
buffers are reserved for the port at speeds of 1 Gb/s, 2 Gb/s, or 4 Gb/s,
respectively. For previously released switches (Bloom1-based), the number of
frames buffers is limited to 63.
LE (3) Level E mode is for E_Ports for distances beyond 5 km and up to 10 km. A total of
5, 10, or 20 full-size frame buffers are reserved for the port at speeds of 1 Gb/s,
2 Gb/s, or 4 Gb/s, respectively. LE does not require an Extended Fabrics license.
LD 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 250
full-size frame buffers are reserved, depending upon the distance measured
during E_Port initialization. If the desired distance is provided, it is used as the
upper limit to the measured distance. For Bloom1-based systems, the number of
frame buffers is limited to 63.