Transition Networks, Inc.
S4224 Web User Guide
33595 Rev. C
Page 660 of 669
Router Port
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
R
apid
S
panning
T
ree
P
rotocol,
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.
S
SA
(Source Address); contrast DA.
SAMBA
Samba is a program running under UNIX-like operating systems 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".
SFP
Small Form Factor Pluggable module (1-4Gbps).
SFP+
Small Form Factor Pluggable Plus module (8-10Gbps).
SHA
SHA (
S
ecure
H
ash
A
lgorithm) is 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.
SHA is an authentication protocol; one of two cryptography methods used for S4224 user authentication. SHA-1
is a cryptographic hash function designed by the National Security Agency (NSA) and published by the NIST as
a U.S. FIPS standard. SHA-1 is part of many widely accepted security applications and protocols (e.g., TLS,
SSL, PGP, SSH, S/MIME, and IPSec). See also “MD5”.
Shaper
A shaper can limit the bandwidth of transmitted frames. It is located after the ingress queues.
Short Pipe Model
One of three different models defined in RFC 3270, and which define, for example, inheritance of TTL and
EXP/TC in the label stack during push and pop. TTL inheritance is defined in RFC 4343. See also "Pipe Model"
and "Uniform Model".
Site-local Address
An IPv6 addresses for local site only. In IPv6, an address having scope that is limited to the local site.
SMAC
(Source MAC Address) The 12 hex digits of a source MAC address consist of the first/left 6 digits (which should
match the vendor of the Ethernet NIC) and the last/right 6 digits which specify the interface serial number for
that interface controller vendor. See also "DMAC". The list below identifies some of the blocks of assigned
vendor MAC addresses (i.e. the first 3 bytes of a MAC source address).
00000C Cisco
00000E Fujitsu
