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7000 Series L3 Managed Switch Reference Manual for Software v1.0
C-22 Glossary
May 30, 2003 Beta Draft
SimpleX signaling
SX is one of IEEE 802.3's designations for media. For example, 1000SX indicates 1000 gigabit Ethernet
over "short haul" or "short wavelength" optical fiber.
SMC1
A model of Serial Management Controller from Motorola.
SMII
Serial Media Independent Interface.
SNMP
See “Simple Network Management Protocol” on page 21.
SODIMM.
Small Outline Dual Inline Memory Module.
Spanning Tree
A technique that detects loops in a network and logically blocks the redundant paths, ensuring that only one
route exists between any two LANs.
Spanning Tree Protocol (STP)
A protocol that finds the most efficient path between segments of a multi-looped, bridged network. STP
allows redundant switches and bridges to be used for network resilience, without the broadcast storms
associated with looping. If a switch or bridge falls, a new path to a redundant switch or bridge is opened.
SRAM
Static Random Access Memory.
STP
Spanning Tree Protocol. See “802.1D” on page 1 for more information.
stub area
OSPF area that carries a default route, intra-area routes, and interarea routes, but does not carry external
routes. Virtual links cannot be configured across a stub area, and they cannot contain an ASBR. Compare
with non-stub area. See also ASAM and OSPF. (Cisco Systems Inc.)
Subnet Mask
Combined with the IP address, the IP Subnet Mask allows a device to know which other addresses are local
to it, and which must be reached through a gateway or router.
Switch
A device that interconnects several LANs to form a single logical LAN that comprises of several LAN
segments. Switches are similar to bridges, in that they connect LANs of a different type; however they
connect more LANs than a bridge and are generally more sophisticated.