3G Archives - SimpleTechTalks

Diameter Agents Simple Explanation

Diameter protocol defines various nodes for specific purposes which are often known as Diameter Agents. These agents are designed to distribute administrations of a system including maintenance of security mechanism. These Agents can also be used for load balancing via routing the diameter protocol messages based on some routing algorithms.
They can also do some sort of processing of diameter protocol messages to forward messages towards the target in a complex network which contains a large number of nodes.

Diameter Agents can be divided into two groups:

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Diameter Protocol AVP Structure

by Sandeep Kumar

Diameter Attribute-Value-Structure (AVP) are the data units inside the diameter messages which contains all the information. There has to be atleast one AVP in every diameter messages. A Diameter message can contain multiple sets of different AVPs. For basic information related to Diameter protocol read article (Diameter Protocol Basics). Structure of an AVP is shown in below image:

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Diameter Protocol Message Structure

by Sandeep Kumar

Diameter protocol is basically a Request/Response kind of protocol, hence this diameter protocol follows client/server model to communicate between nodes. In Diameter protocol, for every request message there will be an answer message for sure. For basic information related to Diameter protocol read article (Diameter Protocol Basics).

A Diameter protocol packet consists of Diameter message header along with variable number of AVP’s (Attribute-Value Pairs). Diameter message data is stored in form of AVP’s in the message.

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Diameter Protocol Basics

by Sandeep Kumar

Diameter protocol is an AAA(Authentication, Authorization and Accounting) protocol vastly used in core network nodes in 3G and LTE architecture. Diameter protocol evolved from RADIUS Protocol with additional functionalities in multiple aspects. Diameter protocol is defined by IETF and is known as Diameter Base Protocol (RFC 6733 (older one RF 3588)) which provides framework for applications like network access, IP mobility etc. Diameter Applications extend the Diameter base protocol by adding new AVP’s, commands etc to provide extended functionalities.

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