Expand Configuration and Management Manual (H06.21+, J06.10+)

Glossary
Expand Configuration and Management Manual — 529522-013
Glossary - 8
network routing table (NRT)
network routing table (NRT). A table that resides in each processor in each system in the
network. The NRT associates each destination system with the logical device (LDEV)
number of the best-path route Expand line-handler process to use to send messages
to that system. See also best-path route and network control process (NCP).
network topology. The pattern of interconnection of systems in a network. Common
network topologies include star, tree, ring, bus, mesh, and mixed.
network utility process. A NonStop Kernel input-output process (IOP), named $ZNUP,
which is used by the network control process ($NCP). $ZNUP answers requests that
require waits for system information. It also responds to requests for the time at remote
systems, the process information of remote processes, device information requests,
and traffic statistics.
node. A uniquely identified computer system connected to one or more other computer
systems in a network.
NonStop Cluster Switch. An assembly consisting of a ServerNet II Switch, an
uninterruptible power supply (UPS), and an AC transfer switch. The NonStop cluster
switch enables the routing of ServerNet messages across an external fabric of a
ServerNet cluster. The assembly can be packaged in a switch enclosure or in a 19-inch
rack.
NRT. See network routing table (NRT).
object type. A category of SCF objects to which a specific object belongs. There are four
Expand SCF object types: PROCESS, PATH, LINE, and ENTRY.
Open Systems Interconnection (OSI). A seven-layer network-architecture model defined
by the International Organization for Standardization (ISO). The two lower layers deal
with the physical connections and their protocols. The five upper layers deal with
network services, such as network file transfers and accessing remote databases.
operator message. A message, intended for an operator, that describes a significant event
on a NonStop server. An operator message is the displayed-text form of an Event
Management Service (EMS) event message.
OSI. See Open Systems Interconnection (OSI).
out-of-sequence (OOS) buffer. A portion of the Expand line-handler process data space
used to buffer packets that are received out of sequence by the Expand line-handler
process. Expand allocates 32767 words to the OOS buffer. See also
out-of-sequence
(OOS) packets.
out-of-sequence (OOS) packets. Packets that are destined for a process at the local
system but that are not received in the same order in which they were sent.