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7000 Series L3 Managed Switch Reference Manual for Software v2.0
C-18 Glossary
O
Open Shortest Path First
A link- state (algorithm used by the router to determine the current topology of a network), Interior Gateway
(distributes routing information between routers belonging to a single Autonomous System) routing
protocol. This protocol's algorithm determines the shortest path from its router to all the other routers in the
network. This protocol is rapidly replacing RIP on the Internet.
Open Systems Interconnection
OSI is a seven (7) layer architecture model for communications systems developed by the ISO for the
interconnection of data communications systems. Each layer uses and builds on the services provided by
those below it.
Operating System Application Programming Interface
OSAPI is a module within the System Support software that provides a set of interfaces to OS support
functions.
OS
Operating System.
OSAPI
See “Operating System Application Programming Interface” on page 18.
OSI
See “Open Systems Interconnection” on page 18.
OSPF
See “Open Shortest Path First” on page 18.
P
packet
A block of information sent over a network. A packet typically contains a source and destination network
address, some protocol and length information, a block of data, and a checksum.
PDU
See “Protocol Data Unit” on page 20.