7000 Series L3 Managed Switch Reference Manual for Software v1.0
C-18
Glossary
May 30, 2003 Beta Draft
OS
Operating System.
OSAPI
See “Operating System Application Programming Interface” on page 17.
OSI
See “Open Systems Interconnection” on page 17.
OSPF
See “Open Shortest Path First” on page 17.
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 19.
PHY
The OSI Physical Layer: The physical layer provides for transmission of cells over a physical medium
connecting two ATM devices. This physical layer is comprised of two sublayers: the Physical Medium
Dependent (PMD) sublayer, and the Transmission Convergence (TC) sublayer.
PIM-DM
See “Protocol Independent Multicast – Dense Mode” on page 19.
PMC
Packet Mode Channel.
Point-to-Point Protocol
PPP. A protocol allowing a computer using TCP/IP to connect directly to the Internet.
Port Mirroring
Also known as a roving analysis port. This is a method of monitoring network traffic that forwards a copy of
each incoming and outgoing packet from one port of a network switch to another port where the packet can
be studied. A network administrator uses port mirroring as a diagnostic tool or debugging feature, especially
when fending off an attack. It enables the administrator to keep close track of switch performance and alter it
if necessary. Port mirroring can be managed locally or remotely. An administrator configures port mirroring
by assigning a port from which to copy all packets and another port where those packets will be sent. A
Summary of Contents for ProSafe GSM7324
Page 4: ...May 30 2003 Beta Draft iv...