Browse Definitions :
Definition

service chaining

Service chaining, in an information technology (IT) context, is the addition of software-defined networking (SDN) capabilities in a specific sequence. Service chaining helps to automate traffic flow between services in a virtual network. It also optimizes the use of network resources to improve application performance by using the best available routing path.  Common use cases for service chaining include network functions virtualization (NFV) deployments, data centers, carrier networks and virtual customer premises equipment (VCPE). Types of network services that can be included within the chain include firewalls, network address translation (NAT), WAN optimization, intrusion protection and load balancing. In this context, service chaining can also be referred to as service function chaining.

How service chaining works

A service chain is made up of the following elements:

  • A service template- This lays the foundation of code that will be used in the service chain.
  • A virtual network- This serves as an abstract connection between physical points within a network.
  • A service instance- This is the actual implementation of a service within a node.
  • A service policy- This is the set of rules dictating how data traffic moves between a virtual network and specific service instances.
What is service chaining?

Once the chain is set up, network operators can create subsets of connected services to allow the use of one network connection for various applications.There is no limit to the number of services that can be connected between virtual machines in this way.  An SDN controller or script can use the chain in different ways depending on the source, destination or traffic type. This way, a packet only receives services that are required. For example, packet A may be forwarded through services 2, 3 and 4 while packet B is forwarded through 1 and 4. Additionally, since service chaining is done in software using virtual circuits, services can be inserted and removed as needed.

This was last updated in July 2019

Continue Reading About service chaining

Networking
Security
  • identity management (ID management)

    Identity management (ID management) is the organizational process for ensuring individuals have the appropriate access to ...

  • single sign-on (SSO)

    Single sign-on (SSO) is a session and user authentication service that permits a user to use one set of login credentials -- for ...

  • fraud detection

    Fraud detection is a set of activities undertaken to prevent money or property from being obtained through false pretenses.

CIO
  • IT budget

    IT budget is the amount of money spent on an organization's information technology systems and services. It includes compensation...

  • project scope

    Project scope is the part of project planning that involves determining and documenting a list of specific project goals, ...

  • core competencies

    For any organization, its core competencies refer to the capabilities, knowledge, skills and resources that constitute its '...

HRSoftware
  • Workday

    Workday is a cloud-based software vendor that specializes in human capital management (HCM) and financial management applications.

  • recruitment management system (RMS)

    A recruitment management system (RMS) is a set of tools designed to manage the employee recruiting and hiring process. It might ...

  • core HR (core human resources)

    Core HR (core human resources) is an umbrella term that refers to the basic tasks and functions of an HR department as it manages...

Customer Experience
  • martech (marketing technology)

    Martech (marketing technology) refers to the integration of software tools, platforms, and applications designed to streamline ...

  • transactional marketing

    Transactional marketing is a business strategy that focuses on single, point-of-sale transactions.

  • customer profiling

    Customer profiling is the detailed and systematic process of constructing a clear portrait of a company's ideal customer by ...

Close