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
  • subnet (subnetwork)

    A subnet, or subnetwork, is a segmented piece of a larger network. More specifically, subnets are a logical partition of an IP ...

  • secure access service edge (SASE)

    Secure access service edge (SASE), pronounced sassy, is a cloud architecture model that bundles together network and cloud-native...

  • Transmission Control Protocol (TCP)

    Transmission Control Protocol (TCP) is a standard protocol on the internet that ensures the reliable transmission of data between...

Security
  • intrusion detection system (IDS)

    An intrusion detection system monitors (IDS) network traffic for suspicious activity and sends alerts when such activity is ...

  • cyber attack

    A cyber attack is any malicious attempt to gain unauthorized access to a computer, computing system or computer network with the ...

  • digital signature

    A digital signature is a mathematical technique used to validate the authenticity and integrity of a digital document, message or...

CIO
  • What is data privacy?

    Data privacy, also called information privacy, is an aspect of data protection that addresses the proper storage, access, ...

  • product development (new product development)

    Product development -- also called new product management -- is a series of steps that includes the conceptualization, design, ...

  • innovation culture

    Innovation culture is the work environment that leaders cultivate to nurture unorthodox thinking and its application.

HRSoftware
  • organizational network analysis (ONA)

    Organizational network analysis (ONA) is a quantitative method for modeling and analyzing how communications, information, ...

  • HireVue

    HireVue is an enterprise video interviewing technology provider of a platform that lets recruiters and hiring managers screen ...

  • Human Resource Certification Institute (HRCI)

    Human Resource Certification Institute (HRCI) is a U.S.-based credentialing organization offering certifications to HR ...

Customer Experience
  • What is an outbound call?

    An outbound call is one initiated by a contact center agent to prospective customers and focuses on sales, lead generation, ...

  • What is lead-to-revenue management (L2RM)?

    Lead-to-revenue management (L2RM) is a set of sales and marketing methods focusing on generating revenue throughout the customer ...

  • What is relationship marketing?

    Relationship marketing is a facet of customer relationship management (CRM) that focuses on customer loyalty and long-term ...

Close