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SD-WAN glossary

Too many acronyms and terms for you to keep track of? Bookmark this glossary of commonly used terms so you can quickly look up a term.

Term Description
Autonomous System (AS) Collection of networks under a common administration sharing a common routing strategy. Autonomous systems are subdivided by areas. An autonomous system must be assigned a unique 16-bit number by the IANA.
BFD Bidirectional Forwarding Detection
BGP Border Gateway Protocol
CMS Cloud Management System
DSCP Differentiated Services Code Point
EBGP External Border Gateway Protocol
ESP Encapsulating Security Payload
FlexVNF Branch Branch is the distributed routing and service node in an SD-WAN topology.
FlexVNF Hub The FlexVNF hub is a uniquely named FlexVNF branch node, running the same FlexVNF software as a branch node, but potentially running multiple tenant organizations, additional scalable centralized services, and may run on elastic cloud and data-center based server resources. The FlexVNF hub may also act as a traffic exchange site in a distributed star topology, and may also assist in hosting IPsec connectivity for sites with restrictive NAT traversal requirements.
Hub A common connection point for devices in a network. A hub contains multiple ports. When a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.
LEF Logging and Export Function
MPLS Multiprotocol Label Switching
NAT Network Address Translation
NAPT Network Address Port Translation
NLRI Network Layer Reachability Information
Post-staging After the staging phase, the branch goes into the post-staging phase. During this phase, the branch is configured for communication with Versa Director.
Router A router is a device that forwards data packets along networks. A router is connected to at least two networks and is located at gateways, the places where two or more networks connect.
SD-WAN Software-defined wide-area network
Staging A branch goes through a Staging phase. During the staging phase, the branch is delivered from a staging server to clients during its initial attachment to the network. The configuration contains a controller address, IPsec and authentication information to connect to the controller(s) hosting the site-specific SD-WAN.
SD-WAN Controller Controller is a specially configured FlexVNF acting as the primary control node for SD-WAN routing and IPSec connectivity. Rather than creating a full mesh of IPsec IKE and security associations, the controller manages the distribution of SD-WAN topology using BGP.
Switch A device that filters and forwards packets between LAN segments. Switches operate at the data link layer (layer 2) and sometimes the network layer (layer 3) of the OSI Reference Model.
Tenant Organizations Tenant organizations are logical containers that enable grouping and partitioning between enterprise organizations (for example, HR, Finance) or customers (for example, Coca Cola, Pepsi). One or more parent organizations are created (for example, Service Provider), along with tenant organizations that are be defined within SD-WAN controllers, hubs and branch nodes.
TTL Time To Live
VCSN Versa Control and Service Node
VNF Virtual Network Function
VNI Virtual Network Interface
VPN A virtual private network (VPN) is a technology that creates an encrypted connection over a less secure network. The benefit of using a VPN is that it ensures the appropriate level of security to the connected systems when the underlying network infrastructure alone cannot provide it.
VRRP Virtual Router Redundancy Protocol
VXLAN Virtual Extensible LAN
Versa Director VNF Manager for all controllers, SD-WAN hubs, and branch nodes. Versa Director is provisioned at one or more data centers with connectivity to management and control networks for the SD-WAN.
Versa Analytics The Versa Analytics node provides a pre-integrated solution to a full operational visibility into the SD-WAN topology. The Analytics node gathers IPFIX data from the controller, hub, and branch sites and archives and displays this data in readily accessible formats.