Technical data

Glossary-18 Brocade SilkWorm 4100 Hardware Reference Manual

Publication Number: 53-0000563-02

LM_TOV Loop master timeout value. The minimum time that the loop master waits for a loop initialization

sequence to return.

Loom The code name given to the second-generation Brocade Fabric ASIC. This is the ASIC used in the

SilkWorm 2xxx series of switches.

loop circuit A temporary bidirectional communication path established between L_Ports.

loop failure Loss of signal within a loop for any period of time, or loss of synchronization for longer than the

timeout value.

Loop_ID A hexadecimal value representing one of the 127 possible AL_PA values in an arbitrated loop.

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.

Loop Mode One of two possible modes for an L_Port, in which the L_Port is in an arbitrated loop, using loop

protocol. An L_Port in Loop Mode can also be in Participating Mode or Nonparticipating Mode.

looplet A set of devices connected in a loop to a port that is a member of another loop.

LPB Loop port bypass. A primitive sequence transmitted by an L_Port to bypass one or all L_Ports to which

it is directed. It is used only in arbitrated loops.

LPE Loop port enable. A primitive sequence transmitted by an L_Port to enable one or all L_Ports that have

been bypassed with the LPB. It is used only in arbitrated loops.

LPSM Loop Port State Machine. Logic that monitors and performs the tasks required for initialization and

access to the loop. It is maintained by an L_Port to track behavior through different phases of loop

operations. Alternatively, the logical entity that performs arbitrated-loop protocols and defines the

behavior of L_Ports when they require access to an arbitrated loop.

LR Link reset. A primitive sequence used during link initialization between two N_Ports in point-to-point

topology or an N_Port and an F_Port in fabric topology. The expected response is an LRR.

LRR Link reset response. A primitive sequence during link initialization between two N_Ports in point-to-

point topology or an N_Port and an F_Port in fabric topology. It is sent in response to an LR and expects

a response of Idle.

LSAN Logical storage area network. An LSAN enables device and storage connectivity that spans two or more

fabrics. The path between devices in an LSAN can be local to a fabric or cross one or more FC routers

and one or more backbone fabrics.

LSAN zone The mechanism by which LSANs are administered. An FC router attached to two fabrics will “listen”

for the creation of matching LSAN zones on both fabrics. If this occurs, it will create phantom domains

and FC-NAT entries as appropriate, and insert entries for them into the name servers on the fabrics.

LSAN zones are compatible with all standard zoning mechanisms.

LWL Long wavelength. A type of fiber optic cabling that is based on 1300-mm lasers and supports link

speeds of 1.0625 Gbit/sec. Can also refer to the type of GBIC or SFP. See also SWL.