User guide

Cisco MDS 8Gb Fabric Switch for HP BladeSystem c-Class User Guide 47
G_Port Generic port. A port that can operate as an E_Port or F_Port. A port is defined as a
G_Port when it is not yet connected or has not yet assumed a specific function in the
fabric. See also
E_Port, F_Port, U_Port.
hard address The AL_PA that an NL_Port attempts to acquire during loop initialization. See also
defined zone configuration.
idle Continuous transmission of an ordered set over an FC link when no data is being
transmitted, to keep the link active and maintain bit, byte, and word synchronization.
integrated fabric The fabric created by connecting multiple HP switches with multiple ISL cables, and
configuring the switches to handle traffic as a seamless group.
ISL trunking The distribution of traffic over the combined bandwidth of multiple ISLs. A set of
trunked ISLs is called a trunking group; the ports in a trunking group are called
trunking ports.
isolated E_Port An E_Port that is online but not operational due to overlapping domain IDs or
nonidentical parameters (such as E_D_TOVs). See also
E_D_TOV.
ITRC IT Resource Center.
K28.5 A special 10-bit character that indicates the beginning of a transmission word that
performs FC control and signaling functions. The first seven bits are the common
pattern.
kernel flash Flash (temporary) memory connected to the peripheral bus of the processor and visible
within the memory space of the processor. Also called user flash.
L_Port Loop port. A node loop port (NL_Port) or fabric loop port (FL_Port) that has arbitrated
loop capabilities. An L_Port can be in one of two modes:
• Fabric mode: Connected to a port that is not loop capable and is using fabric
protocol.
• Loop mode: In an arbitrated loop and using loop protocol. An L_Port in loop mode
can also be in participating mode or non-participating mode. See also
non-participating mode.
latency The time required to transmit a frame from the time it is sent until it arrives. Together,
latency and bandwidth define the speed and capacity of a link or system.
link With respect to FC, a physical connection between two ports, consisting of both
transmit and receive fibers.
link services A protocol for link-related actions.
LIP Loop initialization primitive. The signal that begins initialization in a loop. It indicates
either loop failure or the resetting of a node.
LM_TOV Loop master time-out value. The minimum time that the loop master waits for a loop
initialization sequence to return.
loop failure Loss of signal within a loop for any period of time; loss of synchronization for longer
than the time-out value.
Loop_ID A hexadecimal value representing one of the 127 possible AL_PA values in an
arbitrated loop. See also
AL_PA.
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. See also
AL_PA.
LPSM Loop port state machine. The logical entity that performs arbitrated loop protocols and
defines the behavior of L_Ports when they require access to an arbitrated loop. See
also
L_Port.
LWL Long wavelength. A type of fiber optic cabling that is based on 1300 mm lasers and
supports link speeds up to 2 Gb/s. May also refer to the type of transceiver. See also
SWL.
master port The port that determines the routing paths for all traffic flowing through a trunking
group. One of the ports in the first ISL in the trunking group is designated as the master
port for that group. See also ISL trunking.