Brocade Fabric OS Command Reference Manual (53-1000240-01, November 2006)

Fabric OS Command Reference Manual 2-449
Publication Number: 53-1000240-01
portCfgLongDistance
2
Note: Enter commands in lowercase only; mixed case is for readability.
portCfgLongDistance
Configures a port to support long-distance links.
Synopsis portcfglongdistance [slotnumber/]portnumber [distance_level][vc_translation_link_init]
[desired_distance]
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 be used only as an E_Port. This configuration can be cleared
but not set on VE/VEX_Ports. Changes made by this command are persistent across switch reboots or
power cycles.
N
ote
This command requires a Brocade Extended Fabrics license.
The value of distance_level can be one of the following (the numerical value representing each
distance_level is shown in parentheses):
L0 (0) Specify L0 to configure 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 at speeds of 1 Gbit/sec, 2 Gbit/sec, or 4 Gbit/sec, respectively.
LE (3) Specify LE 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 port speeds of 1 Gbit/
sec, 2 Gbit/sec, or 4 Gbit/sec, respectively. 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 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.
LS (6) Specify LS mode to configure a long-distance link with a fixed buffer allocation..
Up to a total of 250 full-size frame buffers are reserved for data traffic, depending
on the desired distance value provided with the portCfgLongDistance command.
For Bloom1-based systems, the number of frame buffers is limited to 63.