Manual Chapter : BIG-IP e-Commerce Solutions Guide v4.1: Glossary

Applies To:

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BIG-IP versions 1.x - 4.x

  • 4.2 PTF-10, 4.2 PTF-09, 4.2 PTF-08, 4.2 PTF-07, 4.2 PTF-06, 4.2 PTF-05, 4.2 PTF-04, 4.2 PTF-03, 4.2 PTF-02, 4.2 PTF-01, 4.2.0
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BIG-IP web server

The BIG-IP web server runs on a BIG-IP and hosts the Configuration utility.


The bigpipe utility provides command line access to the BIG-IP.


BIG/stat is a statistical monitoring utility that ships on the BIG-IP. This utility provides a snap-shot of statistical information.


BIG/top is a statistical monitoring utility that ships on the BIG-IP. This utility provides real-time statistical information.


The big3d agent is a monitoring utility that collects metrics information about paths between a BIG-IP and a specific local DNS server. The big3d agent runs on BIG-IP units and it forwards metrics information to 3-DNS systems.

BIND (Berkeley Internet Name Domain)

BIND is the most common implementation of DNS, which provides a system for matching domain names to IP addresses.


A chain is a series of filtering criteria used to restrict access to an IP address. The order of the criteria in the chain determines how the filter is applied, from the general criteria first, to the more detailed criteria at the end of the chain.

default VLANs

The BIG-IP is configured with two default VLANs, one for each interface. One default VLAN is named internal and one is named external. See also VLAN.

dynamic site content

Dynamic site content is site content that is automatically generated each time a user accesses the site. Examples are current stock quotes or weather satellite images.

external VLAN

The external VLAN is a default VLAN on the BIG-IP. In a basic configuration, this VLAN has the administration ports locked down. In a normal configuration, this is typically a VLAN on which external clients request connections to internal servers.

floating self IP address

A floating self IP address is an additional self IP address for a VLAN that serves as a shared address by both units of a BIG-IP redundant system.

health check

A health check is a BIG-IP feature that determines whether a node is up or down. Health checks are implemented through health monitors. See also health monitor.

health monitor

A health monitor checks a node to see if it is up and functioning for a given service. If the node fails the check, it is marked down.

HTTP redirect

An HTTP redirect sends an HTTP 302 Object Found message to clients. You can configure a pool with an HTTP redirect to send clients to another node or virtual server if the members of the pool are marked down.

ICMP (Internet Control Message Protocol)

ICMP is an Internet communications protocol used to determine information about routes to destination addresses, such as virtual servers managed by BIG-IP and 3-DNS systems.


The physical port on a BIG-IP is called an interface. See also link.

internal VLAN

The internal VLAN is a default VLAN on the BIG-IP. In a basic configuration, this VLAN has the administration ports open. In a normal configuration, this is a network interface that handles connections from internal servers.


A UDP based protocol used to exchange information between BIG-IP units and 3-DNS systems. The iQuery protocol is officially registered for port 4353.

last hop

A last hop is the final hop a connection took to get to the BIG-IP. You can allow the BIG-IP to determine the last hop automatically to send packets back to the device from which they originated.


A link is a physical interface on the BIG-IP connected to another physical interface in a network.

link aggregation

The link aggregation feature allows you to combine a number of links together to act as one interface.

loopback adapter

A loopback adapter is a software interface that is not associated with an actual network card. The nPath routing configuration requires you to configure loopback adapters on servers.

MAC (Media Access Control)

MAC is a protocol that defines the way workstations gain access to transmission media, and is most widely used in reference to LANs. For IEEE LANs, the MAC layer is the lower sublayer of the data link layer protocol.

MAC address

A MAC address is used to represent hardware devices on an Ethernet network.


The BIG-IP uses monitors to determine whether nodes are up or down. There are several different types of monitors and they use various methods to determine the status of a server or service.

monitor instance

You create a monitor instance when a health monitor is associated with a node, node address, or port. It is the monitor instance that actually performs the health check, not the monitor.

monitor template

A monitor template is a system-supplied health monitor that is used primarily as a template to create user-defined monitors, but in some cases can be used as is. The BIG-IP includes a number of monitor templates, each specific to a service type, for example, HTTP and FTP. The template has a template type that corresponds to the service type and is usually the name of the template.


Named is the name server utility, which manages domain name server software.

NAT (Network Address Translation)

A NAT is an alias IP address that identifies a specific node managed by the BIG-IP to the external network.


A node is a specific combination of an IP address and port (service) number associated with a server in the array that is managed by the BIG-IP.

node address

A node address is the IP address associated with one or more nodes. This IP address can be the real IP address of a network server, or it can be an alias IP address on a network server.

node alias

A node alias is a node address that the BIG-IP uses to verify the status of multiple nodes. When the BIG-IP uses a node alias to check node status, it pings the node alias. If the BIG-IP receives a response to the ping, it marks all nodes associated with the node alias as up. If the controller does not receive a response to the ping, the it marks all nodes associated with the node alias as down.

node port

A node port is the port number or service name that is hosted by a specific node.

node status

Node status indicates whether a node is up and available to receive connections, or down and unavailable. The BIG-IP uses the node ping and health check features to determine node status.


A series of related connections received from the same client, having the same session ID. When persistence is turned on, a controller sends all connections having the same session ID to the same node instead of load balancing the connections.


A port is represented by a number that is associated with a specific service supported by a host. Refer to the Services and Port Index for a list of port numbers and corresponding services.

rate class

You create a rate filter from the Configuration utility or command line utility. When you assign a rate class to a rate filter, a rate class determines the volume of traffic allowed through a rate filter. See also rate filter.

rate filter

Rate filters consist of a basic filter with a rate class. Rate filters are a type of extended IP filter. They use the same IP filter method, but they apply a rate class, which determines the volume of network traffic allowed through the filter. See also rate class.


remote administrative IP address

The remote administrative IP address is an IP address from which a controller allows shell connections, such as Telnet or SSH.

RFC 1918 addresses

An RFC 1918 address is an IP address that is within the range of non-routable addresses described in the IETF RFC 1918.

self IP address

Self IP addresses are the IP addresses owned by the BIG-IP that you use to access the internal and external VLANs.


Service refers to services such as TCP, UDP, HTTP, and FTP.

Setup utility

The Setup utility walks you through the initial system configuration process. You can run the Setup utility from either the command line or the Configuration utility start page.

SNAT (Secure Network Address Translation)

A SNAT is a feature you can configure on the BIG-IP. A SNAT defines a routable alias IP address that one or more nodes can use as a source IP address when making connections to hosts on the external network.

SNAT automap

This feature allows the BIG-IP to perform a SNAT automatically on any connection that is coming from the controller's internal VLAN. It is easier to use than traditional SNATs and solves certain problem associated to traditional SNATs.

SNMP (Simple Network Management Protocol)

SNMP is the Internet standard protocol, defined in STD 15, RFC 1157, developed to manage nodes on an IP network.

SSL gateway

An SSL gateway is a gateway for decrypting HTTPS requests to an HTTP server and encrypting the reply.

state mirroring

State mirroring is a feature on the BIG-IP that preserves connection and persistence information in a BIG-IP redundant system.

static load balancing modes

Static load balancing modes base connection distribution on a pre-defined list of criteria; it does not take current server performance or current connection load into account.

sticky mask

A sticky mask is a special IP mask that you can configure on the BIG-IP. This mask optimizes sticky persistence entries by grouping more of them together.

tagged VLAN

You can define any interface as a member of a tagged VLAN. You can create a list of VLAN tags or names for each tagged interface.

transparent node

A transparent node appears as a router to other network devices, including the BIG-IP.


A trunk is a combination of two or more interfaces and cables configured as one link. See also link aggregation.

virtual address

A virtual address is an IP address associated with one or more virtual servers managed by the BIG-IP.

virtual port

A virtual port is the port number or service name associated with one or more virtual servers managed by the BIG-IP. A virtual port number should be the same TCP or UDP port number to which client programs expect to connect.

virtual server

Virtual servers are a specific combination of virtual address and virtual port, associated with a content site that is managed by a BIG-IP or other type of host server.


VLAN stands for virtual local area network. A VLAN is a logical grouping of network devices. You can use a VLAN to logically group devices that are on different network segments.

VLAN name

A VLAN name is the symbolic name used to identify a VLAN. For example, you might configure a VLAN named marketing, or a VLAN named development. See also VLAN.