Planet Networking & Communication SGS-5240 Series User Manual page 297

LOC
LOC is an acronym for Loss Of Connectivity and is detected by a MEP and is indicating lost connectivity in the network.
Can be used as a switch criteria by EPS
M
MAC Table
Switching of frames is based upon the DMAC address contained in the frame. The switch builds up a table that maps
MAC addresses to switch ports for knowing which ports the frames should go to (based upon the DMAC address in the
frame). This table contains both static and dynamic entries. The static entries are configured by the network
administrator if the administrator wants to do a fixed mapping between the DMAC address and switch ports.
The frames also contain a MAC address (SMAC address), which shows the MAC address of the equipment
sending the frame. The SMAC address is used by the switch to automatically update the MAC table with these
dynamic MAC addresses. Dynamic entries are removed from the MAC table if no frame with the corresponding
SMAC address have been seen after a configurable age time.
MEP
MEP is an acronym for Maintenance Entity Endpoint and is an endpoint in a Maintenance Entity Group (ITU-T
Y.1731).
MD5
MD5 is an acronym for Message-Digest algorithm 5. MD5 is a message digest algorithm, used cryptographic hash
function with a 128-bit hash value. It was designed by Ron Rivest in 1991. MD5 is officially defined in RFC 1321 - The
MD5 Message-Digest Algorithm.
Mirroring
For debugging network problems or monitoring network traffic, the switch system can be configured to mirror frames
from multiple ports to a mirror port. (In this context, mirroring a frame is the same as copying the frame.)
Both incoming (source) and outgoing (destination) frames can be mirrored to the mirror port.
MLD
MLD is an acronym for Multicast Listener Discovery for IPv6. MLD is used by IPv6 routers to discover multicast
listeners on a directly attached link, much as IGMP is used in IPv4. The protocol is embedded in ICMPv6 instead of
using a separate protocol.
MVR
Multicast VLAN Registration (MVR) is a protocol for Layer 2 (IP)-networks that enables multicast-traffic from a source
VLAN to be shared with subscriber-VLANs. The main reason for using MVR is to save bandwidth by preventing
duplicate multicast streams being sent in the core network, instead the stream(s) are received on the MVR-VLAN and
forwarded to the VLANs where hosts have requested it/them (Wikipedia).
N
NAS
NAS is an acronym for Network Access Server. The NAS is meant to act as a gateway to guard access to a
protected source. A client connects to the NAS, and the NAS connects to another resource asking whether the
client's supplied credentials are valid. Based on the answer, the NAS then allows or disallows access to the
protected resource. An example of a NAS implementation is IEEE 802.1X.
NetBIOS
NetBIOS is an acronym for Network Basic Input/output System. It is a program that allows applications on separate
computers to communicate within a Local Area Network (LAN), and it is not supported on a Wide Area Network (WAN).
The NetBIOS giving each computer in the network both a NetBIOS name and an IP address corresponding to a
different host name, provides the session and transport services described in the Open Systems Interconnection
(OSI) model.
User's Manual of SGS-5240 Series Managed Switch
297