Fabric OS Reference Manual

192 Fabric OS Reference Manual
setSplbMode
Enable or disable 2-port loopback.
Synopsis
setSplbMode [0|1]
Availability admin
Description Use this command to enable SPLB mode if the operand is
1
and disable the
SPLB mode if the operand is
0
. The mode is saved in flash memory and
stays in that mode until the next execution of
setSplbMode
.
The mode becomes active as soon as this command is executed. It does not
require a reboot to take effect.
The SPLB mode, when enabled, forces
spinSilk
to disable two-port
loopback for M->M connected ports. This may be useful to isolate internal
switch problems from GBIC problems since the internal paths are used
much less with SPLB mode enabled.
The SPLB mode, when disabled, forces
spinSilk
to circulate frames
between pairs of M->M connected ports:
P1 TX >>> P1 RX -> P2 TX >>> P2 RX -> P1 TX
>>> cable or internal loop-back
-> routing table entry
The connections between pairs of M->M ports will be chosen to exercise
the connections between as many chips (or bloom quadrants) as possible
subject to the setting of allow_intra_chip and the availability of pairs of
M->M ports.
Any ports that are cross-cabled will be routed to each other in the normal
manner regardless of the setting of SPLB mode:
P1 TX >>> P2 RX -> P1 TX
P2 TX >>> P1 RX -> P2 TX