Specifications

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Cisco Internet Streamer CDS 2.0-2.3 Software Configuration Guide
OL-13493-04
Chapter 1 Product Overview
Content Delivery System Architecture
Management
The Internet Streaming CDSM, a secure Web browser-based user interface, is a centralized system
management device that allows an administrator to manage and monitor the entire CDS network. All
devices, Service Engines and Service Routers, in the CDS are registered to the Internet Streaming
CDSM.
Service Engines can be organized into user-defined device groups to allow administrators to apply
configuration changes and perform other group operations on multiple devices simultaneously. One
device may belong to multiple device groups.
The Internet Streaming CDSM also provides an automated workflow to apply a software image upgrade
to a device group.
Content Delivery System Architecture
The CDS consists of an Internet Streaming CDSM, one or more Service Engines, and one Service
Router. For full redundancy, a CDS would include an additional CDSM and Service Router. The Service
Engine handles content ingest, content distribution within the CDS, and content delivery to client
devices. The Service Router handles client requests and redirects the client to the most appropriate
Service Engine. The Internet Streaming CDSM manages and monitors the CDS, the delivery services,
and all the devices in the CDS.
This section covers the following topics:
• Service Engine
• Service Router
• Content Delivery System Manager
• Resiliency and Redundancy
Service Engine
Each Service Engine can function as a Content Acquirer and Internet Streamer, or just as an Internet
Streamer. Based on the Service Engines’ assignments to different delivery services, the right set of
applications supporting the functions is enabled. For example, only one Service Engine is assigned the
role of Content Acquirer in each delivery service. In addition, the Service Engine assigned as the Content
Acquirer in a delivery service also includes the functions of an Internet Streamer.
Both the Content Acquirer and the Internet Streamer applications have storage and distribution functions
within the CDS, which include the following:
• Management of the physical storage of content and metadata. Content URLs are translated into their
physical file paths for content retrieval, deletion, and update.
• Management of dynamically ingested content and periodic replacement of content not accessed
frequently. Content replacement is performed by means of sophisticated content-replacement
algorithms. The algorithms add “weight” to the content according to size, frequency of access, and
other attributes to produce the list of content that needs to be purged.
• Ingest of prefetched content and retrieval of such content for distribution to other Service Engines
in the same delivery service.