Appendix A
Acronyms
139
RDI
RDI is an acronym for Remote Defect Indication. It is a OAM functionality that is used by a MEP to indicate defect
detected to the remote peer MEP.
Router Port
A router port is a port on the Ethernet switch that leads switch towards the Layer 3 multicast device.
RSTP
In 1998, the IEEE with document 802.1w introduced an evolution of STP: the Rapid Spanning Tree Protocol, which
provides for faster spanning tree convergence after a topology change. Standard IEEE 802.1D-2004 now incorporates
RSTP and obsoletes STP, while at the same time being backwards-compatible with STP.
SAMBA
Samba is a program running under UNIX-like operating systems (not the Brazilian dance) that provides seamless
integration between UNIX and Microsoft Windows machines. Samba acts as file and print servers for Microsoft
Windows, IBM OS/2, and other SMB client machines. Samba uses the Server Message Block (SMB) protocol and
Common Internet File System (CIFS), which is the underlying protocol used in Microsoft Windows networking.
Samba can be installed on a variety of operating system platforms, including Linux, most common Unix platforms,
OpenVMS, and IBM OS/2.
Samba can also register itself with the master browser on the network so that it would appear in the listing of hosts
in Microsoft Windows "Neighborhood Network".
sFlow
sFlow is an industry standard technology for monitoring switched networks through random sampling of packets on
switch ports and time-based sampling of port counters. The sampled packets and counters (referred to as flow
samples and counter samples, respectively) are sent as sFlow UDP datagrams to a central network traffic monitoring
server. This central server is called an sFlow receiver or sFlow collector.
Additional information can be found at
http://sflow.org
.
SHA
SHA is an acronym for Secure Hash Algorithm. It designed by the National Security Agency (NSA) and published by
the NIST as a U.S. Federal Information Processing Standard. Hash algorithms compute a fixed-length digital
representation (known as a message digest) of an input data sequence (the message) of any length.
Shaper
A shaper can limit the bandwidth of transmitted frames. It is located after the ingress queues.
SMTP
SMTP is an acronym for Simple Mail Transfer Protocol. It is a text-based protocol that uses the Transmission Control
Protocol (TCP) and provides a mail service modeled on the FTP file transfer service. SMTP transfers mail messages
between systems and notifications regarding incoming mail.
SNAP
The SubNetwork Access Protocol (SNAP) is a mechanism for multiplexing, on networks using IEEE 802.2 LLC, more
protocols than can be distinguished by the 8-bit 802.2 Service Access Point (SAP) fields. SNAP supports identifying
protocols by Ethernet type field values; it also supports vendor-private protocol identifier.
SNMP
SNMP is an acronym for Simple Network Management Protocol. It is part of the Transmission Control
Protocol/Internet Protocol (TCP/IP) protocol for network management. SNMP allow diverse network objects to
participate in a network management architecture. It enables network management systems to learn network
problems by receiving traps or change notices from network devices implementing SNMP.
SNTP
SNTP is an acronym for Simple Network Time Protocol, a network protocol for synchronizing the clocks of computer
systems. SNTP uses UDP (datagrams) as transport layer.
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