Appendix C:
Glossary
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IP Source Guard
IP Source Guard is a secure feature used to restrict IP traffic on DHCP snooping untrusted
ports by filtering traffic based on the DHCP Snooping Table or manually configured IP Source
Bindings. It helps prevent IP spoofing attacks when a host tries to spoof and use the IP
address of another host.
L
LACP
LACP is an IEEE 802.3ad standard protocol. The
L
ink
A
ggregation
C
ontrol
P
rotocol, allows
bundling several physical ports together to form a single logical port.
LLC
The IEEE 802.2
L
ogical
L
ink
C
ontrol (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
L
ink
L
ayer
D
iscovery
P
rotocol (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 maximum response time used to calculate the
Maximum Response 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).
