An L3 agent is a Neutron agent that enables administrators and tenants to create routers that interconnect L2 networks and floating IPs that create ports on private networks to make them publicly accessible.
Fuel configures an L3 agent on each controller node which helps avoid the performance bottlenecks. neutron-server handles network rescheduling by automatically reassigning routers to available L3 agents every time it detects an unresponsive L3 agent.
Layer 3 VPN is a virtual network technology
Link Aggregation Control Protocol, or LACP, is a network technology that enables you to combine multiple network links into one logical channel to provide better network performance and redundancy.
Load Balancing as a Service (LBaaS) is an OpenStack network technology that enables cloud operators to leverage third-party load balancing tools. Using load balancers helps to optimize your environment by using resources more efficiently, maximizing throughput, and minimizing latency.
A leaf switch is a switch that connects a server to the main network of spine switches. In a leaf-spine network architecture, leaf switches connect to multiple spine switches as opposed to tree network architecture that typically consist of multiple layers of switches that form a tree-like network scheme.
Logical Volume Manager (LVM) is a Linux kernel component that provides volume management including creation of virtual disks and partitions. Fuel selects LVM as the default storage back end for the Cinder block storage.
Linux containers (LXC) is a virtualization technology that enables you to create multiple isolated systems with a shared Linux kernel.