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LGB5128A User Manual
240
LOC is an acronym for Loss Of Connectivity and is detected by a MEP. It indicates lost
connectivity in the network. Can be used as 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) that 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 frames 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 guards 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