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iSR6152 Router Manager
User’s Guide
Glossary-4 ISR645610-00 B
G_Port
Generic port. A port that can operate as
either an E_Port or an F_Port. A G_Port
can determine operating mode at switch
port initialization, F_Port when an N_Port
attachment is determined, E_Port when an
E_Port attachment is determined. See
E_Port, F_Port, FL_Port, L_Port, N_Port,
NL_Port.
generic port
See G_Port.
heartbeat LED
A chassis LED that indicates the router
status.
hot replaceable
Also known as hot swappable, this means
you can add new devices or remove
existing ones when the system is running.
IANA
Internet Assigned Numbers Authority
(IANA) is responsible for the global coordi-
nation of the DNS root, IP addressing, and
other Internet protocol resources.
initiator
System component, such as a network
interface card, that originates an I/O
operation.
Internet Assigned Numbers Authority
See IANA.
Internet Protocol
See IP.
Internet small computer system interface
See iSCSI.
IOCB
Input/output control block. A command
structure in QLogic intelligent storage
peripheral (ISP) architecture.
IOCTL
Input/output control. A system call in Unix
and Linux systems that allows an applica-
tion to control or communicate with a
device driver outside usual read/write
operations.
IP
Internet Protocol. A method by which data
are sent from one computer to another
over the Internet. IP specifies the format of
packets, also called datagrams, and the
addressing scheme.
iSCSI
Internet small computer system interface.
Protocol that encapsulates data into IP
packets to send over Ethernet connec-
tions.
iSNS
Internet simple name service is used for
discovery and management of IP-based
SANs.
jumbo frames
Large IP frames used in high-performance
networks to increase performance over
long distances. Jumbo frames generally
means 9,000 bytes for Gigabit Ethernet,
but can refer to anything over the IP MTU,
which is 1,500 bytes on an Ethernet.
L_Port
Loop port. Does arbitrated loop functions
and protocols. NL_Ports and FL_Ports are
examples of loop-capable ports. See
E_Port, F_Port, FL_Port, G_Port, N_Port,
NL_Port
.