TCP/IP Management Programming Manual

Glossary
HP NonStop TCP/IP Management Programming Manual—529636-001
Glossary-6
Ethernet
error lists to explain the error further. The token code for the error token is ZSPI-TKN-
ERROR. Its value is a structure consisting of the subsystem ID and an error number
identifying the error. See also error list, error number, or return token.
Ethernet. A popular local area network technology invented at the Xerox Corporation Palo
Alto Research Center. An Ethernet itself is a passive coaxial cable; the
interconnections all contain active components. Ethernet is a best-effort delivery
system that uses CSMA/CD technology. Xerox Corporation, Digital Equipment
Corporation, and Intel Corporation developed and published the standard for 10 Mbps
Ethernet.
Ethernet 4 ServerNet adapter (E4SA). A ServerNet adapter for Ethernet local area
networks (LANs) that contains four Ethernet ports.
Ethernet meltdown. An event that causes saturation or near saturation on an Ethernet. It
usually results from illegal or misrouted packets and typically lasts only a short time. As
an example, consider an IP datagram directed to a nonexistent host and delivered by
way of hardware broadcast to all machines on the network. Gateways receiving the
broadcast will send out ARP packets in an attempt to find the host and deliver the
datagram.
event. In DSM terms, a significant change in some condition in the system or network.
Events can be operational errors, notifications of limits exceeded, requests for action
needed, and so on.
event log. A file or set of files maintained by EMS to store event messages generated by
subsystems.
Event Management Service (EMS). .A part of DSM used to provide event collection, event
logging, and event distribution facilities. It provides for different event descriptions for
interactive and programmatic interfaces, lets an operator or application select specific
event-message data, and allows for the flexible distribution of event messages within a
system or network. EMS has an SPI-based programmatic interface for both reporting
and retrieving events. See also DSM
or event message.
event management. The reporting and logging of events, the distribution and retrieval of
information concerning those events, and the actions taken by operations personnel or
software in response to the events. Compare control and inquiry
.
event message. A special kind of SPI message that describes an event occurring in the
system or network. Compare command message.
Expand. The Expand subsystem enables you to link together as many as 255
geographically dispersed NonStop systems to create a network with the same
reliability, capacity to preserve data integrity, and potential expansion as a single
Tandem system.