Brocade Fabric OS Command Reference Manual - Supporting Fabric OS v5.3.0 (53-1000436-01, June 2007)

Fabric OS Command Reference Manual 463
53-1000436-01
portCfgLongDistance
2
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.
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.
Depending on the switch platform and the frame buffers availability within the port group, the LD or
LS-level links can operate up to distances of 500 Km, 250 Km, or 125 Km at the fixed speed of 1
Gbit/sec, 2 Gbit/sec, or 4 Gbit/sec, respectively. (On some older switch platforms, the LD mode
link can operate up to distances of 200 Km and 100 Km at the fixed speeds of 1 Gbit/sec and 2
Gbit/sec, respectively.)
A long-distance link also can be configured to be part of a trunk group (see 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 enables the long-distance link initialization sequence. It must
be set to 1 for a long-distance link not configured for ISL R_RDY mode; otherwise, it must be reset
to 0.