Technical data

Glossary-10 Fabric OS Administrator’s Guide
Publication Number: 53-0000518-09
L
L_Port Loop port. A node port (NL_Port) or fabric port (FL_Port) that has arbitrated loop capabilities. An
L_Port can be in either Fabric Mode or Loop Mode.
LAN Local area network. A network in which transmissions typically take place over fewer than 5 kilometers
(3.4 miles).
latency The time required to transmit a frame. Together, latency and bandwidth define the speed and capacity of
a link or system.
LED Light-emitting diode. Used to indicate the status of elements on a switch.
LIFA Loop-initialization fabric-assigned frame. Contains a bitmap of all fabric-assigned AL_PAs and is the
first frame transmitted in the loop initialization process after a temporary loop master has been selected.
LIHA Loop-initialization hard-assigned frame. A hard-assigned AL_PA that is indicated by a bit set and is the
third frame transmitted in the loop initialization process after a temporary loop master has been
selected.
LILP Loop-initialization loop-position frame. The final frame transmitted in a loop initialization process. A
returned LIRP contains an accumulation of all of the AL_PA position maps. This allows loop members
to determine their relative loop position. This is an optional frame and is not transmitted unless the
LIRP is also transmitted.
Link Services A protocol for link-related actions.
LIP Loop initialization primitive. The signal used to begin initialization in a loop. Indicates either loop
failure or node resetting.
LIPA Loop-initialization previously assigned. The device marks a bit in the bitmap if it did not log in with the
fabric in a previous loop initialization.
LIRP Loop-initialization report position frame. The first frame transmitted in the loop initialization process
after all L_Ports have selected an AL_PA. The LIRP gets transmitted around the loop so all L_Ports can
report their relative physical position. This is an optional frame.
LISA Loop-initialization soft-assigned frame. The fourth frame transmitted in the loop initialization process
after a temporary loop master has been selected. L_Ports that have not selected an AL_PA in a LIFA,
LIPA, or LIHA frame select their AL_PA here.
LISM Loop-initialization select master frame. The first frame transmitted in the initialization process when
L_Ports select an AL_PA. LISM is used to select a temporary loop master or the L_Port that will
subsequently start transmission of the LIFA, LIPA, LIHA, LISA, LIRP, or LILP frames.
LM_TOV Loop master timeout value. The minimum time that the loop master waits for a loop initialization
sequence to return.
loop
initialization
The logical procedure used by an L_Port to discover its environment. Can be used to assign AL_PA
addresses, detect loop failure, or reset a node.
looplet A set of devices connected in a loop to a port that is a member of another loop.