Planet MGSD-10080F User Manual page 630

The IEEE 802.2 Logical Link Control (LLC) protocol provides a link mechanism for upper layer protocols. It is the upper
sub-layer of the Data Link Layer and provides multiplexing mechanisms that make it possible for several network
protocols (IP, IPX) to coexist within a multipoint network. LLC header consists of 1 byte DSAP (Destination Service
Access Point), 1 byte SSAP (Source Service Access Point), 1 or 2 bytes Control field followed by LLC information.
LLDP
LLDP is an IEEE 802.1ab standard protocol.
The Link Layer Discovery Protocol (LLDP) specified in this standard allows stations attached to an IEEE 802 LAN to
advertise, to other stations attached to the same IEEE 802 LAN, the major capabilities provided by the system
incorporating that station, the management address or addresses of the entity or entities that provide management of
those capabilities, and the identification of the stations point of attachment to the IEEE 802 LAN required by those
management entity or entities. The information distributed via this protocol is stored by its recipients in a standard
Management Information Base (MIB), making it possible for the information to be accessed by a Network Management
System (NMS) using a management protocol such as the Simple Network Management Protocol (SNMP).
LLDP-MED
LLDP-MED is an extension of IEEE 802.1ab and is defined by the telecommunication industry association (TIA-1057).
LLQI
LLQI (Last Listener Query Interval) is the maximun response time used to calculate the Maximun Respse Code
inserted into Specific Queries. It is used to detect the departure of the last listener for a multicast address or source. In
IGMP, this term is called LMQI (Last Member Query Interval).
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 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 there's no frame with the corresponding SMAC
address have been seen after a configurable age time.
MEP
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User's Manual of MGSD-10080F