L
LACP
Link Aggregation Control Protocol. LACP is part of the IEEE 802.3ad and automatically
configures multiple aggregated links between switches.
LAG
Link aggregation group. A LAG is the logical high-bandwidth link that results from
grouping multiple network links in link aggregation (or load sharing). You can configure
static LAGs or dynamic LAGs (using the LACP).
Layer 2
Layer 2 is the second, or data link, layer of the OSI model, or the MAC layer. This
layer is responsible for transmitting frames across the physical link by reading the hardware,
or MAC, source and destination addresses.
Layer 3
Layer 3 is the third layer of the OSI model. Also known as the network layer, Layer 3
is responsible for routing packets to different LANs by reading the network
address.
LED
Light-emitting diode. LEDs are on the device and provide information on various states
of the device‘s operation. See your hardware documentation for a complete explanation of the
LEDs on devices running ExtremeXOS.
legacy
certificate
The certificates that
shipped with Extreme Management Center and NAC 4.0.0 and earlier.
LFS
Link Fault Signal. LFS, which conforms to IEEE standard 802.3ae-2002, monitors 10 Gbps
ports and indicates either remote faults or local faults.
license
ExtremeXOS version 11.1 introduces a licensing feature to the ExtremeXOS software. You
must have a license, which you obtain from Extreme Networks, to apply the full functionality
of some features.
link aggregation
Link aggregation, also known as trunking or load sharing, conforms to IEEE 802.3ad.
This feature is the grouping of multiple network links into one logical high-bandwidth
link.
link type
In
OSPF, there are four link types that you can configure: auto,
broadcast, point-to-point, and passive.
LLDP
Link Layer Discovery Protocol. LLDP conforms to IEEE 802.1ab and is a neighbor
discovery protocol. Each LLDP-enabled device transmits information to its neighbors, including
chassis and port identification, system name and description, VLAN names, and other selected
networking information. The protocol also specifies timing intervals in order to ensure
current information is being transmitted and received.
load sharing
Load sharing, also known as trunking or link aggregation, conforms to IEEE 802.3ad.
This feature is the grouping of multiple network links into one logical high-bandwidth link.
For example, by grouping four 100 Mbps of full-duplex bandwidth into one logical link, you can
create up to 800 Mbps of bandwidth. Thus, you increase bandwidth and availability by using a
group of ports to carry traffic in parallel between switches.
loop detection
In
ELRP, loop detection is the process used to detect a loop in the
network. The switch sending the ELRP PDU waits to receive its original PDU back. If the switch
received this original PDU, there is a loop in the network.
LSA
Link state
advertisement. An LSA is a broadcast packet used by link state protocols, such as
OSPF. The LSA contains information about neighbors and path costs
and is used by the receiving router to maintain a routing table.
LSDB
Link state database. In
OSPF, LSDB is a database of information about the link state
of the network. Two neighboring routers consider themselves to be adjacent only if their LSDBs
are synchronized. All routing information is exchanged only between adjacent
routers.