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Glossary

Common Cumulus Linux and NetQ Terminology

The following table covers some basic terms used throughout the NetQ user documentation.

Term

Definition

Agent

NetQ software that resides on a host server that provides metrics about the host to the NetQ Telemetry Server for network health analysis.

Alarm

In UI, event with critical severity.

Bridge

Device that connects two communication networks or network segments. Occurs at OSI Model Layer 2, Data Link Layer.

Clos

Multistage circuit switching network used by the telecommunications industry, first formalized by Charles Clos in 1952.

Device

UI term referring to a switch, host, or chassis or combination of these. Typically used when describing hardware and components versus a software or network topology. See also Node.

Event

Change or occurrence in network or component; may or may not trigger a notification. In the NetQ UI, there are two types of events: Alarms which indicate a critical severity event, and Info which indicate warning, informational, and debugging severity events.

Fabric

Network topology where a set of network nodes is interconnected through one or more network switches.

Fresh

Node that has been heard from in the last 90 seconds.

High Availability

Software used to provide a high percentage of uptime (running and available) for network devices.

Host

Device that is connected to a TCP/IP network. May run one or more Virtual Machines.

Hypervisor

Software which creates and runs Virtual Machines. Also called a Virtual Machine Monitor.

Info

In UI, event with warning, informational, or debugging severity.

IP Address

An Internet Protocol address is comprised of a series of numbers assigned to a network device to uniquely identify it on a given network. Version 4 addresses are 32 bits and written in dotted decimal notation with 8-bit binary numbers separated by decimal points. Example: 10.10.10.255. Version 6 addresses are 128 bits and written in 16-bit hexadecimal numbers separated by colons. Example: 2018:3468:1B5F::6482:D673.

Leaf

An access layer switch in a Spine-Leaf or Clos topology. An Exit-Leaf is switch that connects to services outside of the Data Center such as firewalls, load balancers, and Internet routers.

See also Spine, CLOS, Top of Rack and Access Switch.

Linux

Set of free and open-source software operating systems built around the Linux kernel. Cumulus Linux is one available distribution packages.

Node

UI term referring to a switch, host or chassis in a topology.

Notification

Item that informs a user of an event. In UI there are two types of notifications: Alert which is a notification sent by system to inform a user about an event; specifically received through a third-party application, and Message which is a notification sent by a user to share content with another user.

Peerlink

Link, or bonded links, used to connect two switches in an MLAG pair.

Rotten

Node that has not been heard from in 90 seconds or more.

Router

Device that forwards data packets (directs traffic) from nodes on one communication network to nodes on another network. Occurs at the OSI Model Layer 3, Network Layer.

Spine

Used to describe the role of a switch in a Spine-Leaf or CLOS topology. See also Aggregation switch, End of Row switch, and distribution switch.

Switch

High-speed device that connects that receives data packets from one device or node and redirects them to other devices or nodes on a network.

Telemetry server

NetQ server which receives metrics and other data from NetQ agents on leaf and spine switches and hosts.

Top of Rack

Switch that connects to the network (versus internally)

Virtual Machine

Emulation of a computer system that provides all of the functions of a particular architecture.

Web-scale

A network architecture designed to deliver capabilities of large cloud service providers within an enterprise IT environment.

Whitebox

Generic, off-the-shelf, switch or router hardware used in Software Defined Networks (SDN).

Common Cumulus Linux and NetQ Acronyms

The following table covers some common acronyms used throughout the NetQ user documentation.

AcronymMeaning
ACLAccess Control Link
ARPAddress Resolution Protocol
ASNAutonomous System Number
BGP/eBGP/iBGPBorder Gateway Protocol, External BGP, Internal BGP
CLAGCumulus multi-chassis Link Aggregation Group
DHCPDynamic Host Control Protocol
DNSDomain Name Server
ECMPEqual Cost Multi-Path routing
EVPNEthernet Virtual Private Network
FDBForwarding Data Base
GNUGNU’s Not Linux
HAHigh Availability
IGMPInternet Group Management Protocol
IPv4/IPv6Internet Protocol, version 4 or 6
LACPLink Aggregation Control Protocol
LANLocal Area Network
LLDPLink Layer Data Protocol
MACMedia Access Control
MIBManagement Information Base
MLAGMulti-chassis Link Aggregation Group
MLDMulticast Listener Discovery
NTPNetwork Time Protocol
OOBOut of Band (management)
OSPFOpen Shortest Path First
RFCRemote Function Call
SDNSoftware-Defined Network
SNMPSimple Network Management Protocol
SSHSecure SHell
SQLStructured Query Language
STPSpanning Tree Protocol
TCPTransport Control Protocol
ToRTop of Rack
UDPUser Datagram Protocol
URLUniversal Resource Locator
USBUniversal Serial Bus
VLANVirtual Local Area Network
VNIVirtual Network Instance
VPNVirtual Private Network
VRFVirtual Routing and Forwarding
VRRVirtual Router Redundancy
VTEPVXLAN Tunnel EndPoint
VXLANVirtual Extensible Local Area Network
ZTPZero Touch Provisioning