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M
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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.
MLD Querier
A router sends MLD Query messages onto a particular link. This router is called the Querier. There will be
only one MLD Querier that wins Querier election on a particular link.
MPLS
The Multi-Protocol Label Switching (MPLS). It is a mechanism for speeding up the network traffic
transmission. The protocol use the Layer 2(Switching) label to forward packets. Instead of the Layer
3(Routing) level, it can avoid the complex destination lookups in routing table. MPLS uses a variety of
protocols to establish the network path, which are called Label Switched Paths (LSPs) then forward the
packet via the network paths. The packet will be labeled at the edge of the service provider's network and
service providers can use the label information to decide the best way for traffic flow forwarding.
The MPLS-TP (Multi-Protocol Label Switching Transport Profile) extensions to MPLS being designed by the
IETF based on requirements provided by service providers. It will be designed for use as a network layer
technology in transport networks. MPLS-TP provides service providers with a reliable packet-based
technology that is based upon circuit-based transport networking, and thus is expected to align with current
organizational processes and large-scale work procedures similar to other packet transport technologies.
398 - Glossary
RocketLinx MP1204-XT User Guide: 2000644 Rev. A
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