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Glossary
g-5
Glossary
mirroring A fault tolerance method in which a backup data storage device
maintains data identical to that on the primary device and can
replace the primary if it fails.
N_port N_port is a node port, or a port on a disk or computer. An N_port can
only communicate with another N_port on another node, or to a
switch.
NL_port Node Loop port; a port supporting the Arbitrated Loop protocol.
node number In UltraNet Edge 3000 networking, a node number is a number
assigned to a specific UltraNet Edge 3000. Each node number must
be unique within the network. Valid values are 00–FF
(hexadecimal). The node number is an arbitrary assignment; you can
use any numbering convention. The default is zero.
OSPF Abbreviation for Open Shortest Path First, a routing protocol
developed for
IP networks based on the shortest path first or
link-state algorithm. Routers use link-state algorithms to send
routing information to all nodes in an internetwork by calculating the
shortest path to each node based on a topography of the Internet
constructed by each node. Each router sends that portion of the
routing table (keeps track of routes to particular network
destinations) that describes the state of its own links, and it also
sends the complete routing structure (topography). The advantage of
shortest path first algorithms is that they result in smaller more
frequent updates everywhere. They converge quickly, thus
preventing such problems as routing loops and Count-to-Infinity
(when routers continuously increment the hop count to a particular
network). This makes for a stable network. The disadvantage of
shortest path first algorithms is that they require a lot of CPU power
and memory. In the end, the advantages out weigh the disadvantages.
OSPF Version 2 is defined in RFC 1583. It is rapidly replacing RIP
on the Internet.
PCI See Peripheral Component Interconnect.
Peripheral Component
Interconnect
A 32-bit local bus(or 64-bit local bus for ATM OC-12) that can
transfer data between the main microprocessor (the CPU) and
peripherals at up to 132 Mbps.
peripheral device A piece of equipment such as a printer, monitor, disk, or tape unit,
that is not physically part of the computer.
protocol A set of conventions governing the treatment and the formatting of
data in electronic environments (between computers, computers and
devices, or over computer networks).