Node types

TSN

A TAS Storage Node (TSN) is a VM that runs two Cassandra databases and provides these databases' services to the other node types in a Rhino VoLTE TAS deployment. TSNs run in a cluster with between 3 and 30 nodes per cluster depending on deployment size; load-balancing is performed automatically.

ShCM

An Sh Cache Microservice node provides HTTP access to the HSS via Diameter Sh, as well as caching some of that data to reduce round trips to the HSS.

MAG

A Management and Authentication Gateway (MAG) node is a node that runs the XCAP server (part of Sentinel VoLTE), and Sentinel AGW, Metaswitch’s implementation of the 3GPP Generic Authentication Architecture (GAA) framework, consisting of the NAF Authentication Filter and BSF components. It also runs the Rhino Element Manager management and monitoring software. The BSF runs in Rhino, all the other components run in Apache Tomcat.

MMT CDMA

An MMTel (MMT) node is a VM that runs the Sentinel VoLTE application on Rhino. It provides both SCC and MMTel functionality. It is available in both a GSM and CDMA variant.

Important

This book documents the CDMA version of the MMT node. If you are installing a GSM deployment, please refer to the RVT VM Install Guide (GSM).

SMO

A Short Message Gateway and OCSS7 (SMO) node is a VM that runs the Sentinel IP-SM-GW application on Rhino, which provides IP Short Message Gateway functionality. It also runs the OCSS7 application, which provides the SS7 protocol stack for the MMT and SMO nodes.

VM sizes

Refer to the Flavors section for information on the VMs' sizing: number of vCPUs, RAM, and virtual disk.

Ancillary node types

The SIMPL VM

The SIMPL Virtual Appliance provides orchestration software to create, verify, configure, destroy and upgrade RVT instances. Following the initial deployment, you will only need the SIMPL VM to perform configuration changes, patching or upgrades - it is not required for normal operation of the RVT deployment.

Installation

SIMPL supports VM orchestration for numerous Metaswitch products, including MDM (see below). SIMPL is normally deployed as a single VM instance, though deployments involving a large number of products may require two or three SIMPL instances to hold all the VM images.

Virtual hardware requirements for the SIMPL VM can be found in the "VM specification" section of the SIMPL VM Documentation.

Instructions for deploying the SIMPL VM can be found here for VMware vSphere, or here for OpenStack.

Upgrade

The deployment you are upgrading should already contain a SIMPL VM. Ensure the SIMPL VM is upgraded to the latest version before proceeding with the upgrade of the RVT nodes.

Metaswitch Deployment Manager (MDM)

Rhino VoLTE TAS deployments use Metaswitch Deployment Manager (MDM) to co-ordinate installation, upgrades, scale and healing (replacement of failed instances). MDM is a virtual appliance that provides state monitoring, DNS and NTP services to the deployment. It is deployed as a pool of at least three virtual machines, and can also manage other Metaswitch products that might be present in your deployment such as Service Assurance Server (SAS) and Clearwater. A single pool of VMs can manage all instances of compatible Metaswitch products you are using.

Installation

You must deploy MDM before deploying any of the RVT nodes.

Upgrade

If you are upgrading from a deployment which already has MDM, ensure all MDM instances are upgraded before starting the upgrade of the RVT nodes. Your Customer Care Representative can provide guidance on upgrading MDM.

If you are upgrading from a deployment which does not have MDM, you must deploy MDM before upgrading any RVT nodes.

Minimum number of nodes required

For a production deployment, all the node types required are listed in the following table, along with the minimum number of nodes of each type. The exact number of nodes of each type required will depend on your projected traffic capacity and profile.

For a lab deployment, it is recommended to install all node types. However it is possible to omit MMT, ShCM, SMO, or MAG nodes if those node-types are not a concern for your lab testing. Note that the TSNs must be included for all lab deployments, as those are required for successful configuration of other node types.

Node type Minimum nodes for production deployment Recommended minimum nodes for lab deployment

TSN

3 per site

3 for the whole deployment

ShCM

2 per site

1 for the whole deployment

MAG

3 per site

1 per site

MMT CDMA

3 per site

1 per site

SMO

3 per site

1 per site

SIMPL

1 for the whole deployment

1 for the whole deployment

MDM

3 per site

1 per site

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Rhino VoLTE TAS VMs Version 4.0.0