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Cisco Application and Content Networking System (ACNS) Software

Field Notice: CDN Features Could Become Nonfunctional After Upgrading to ACNS 5.0


January 28, 2003


Products Affected

Products

Comments

CDM-4630

 

CDM-4650

 

CDM-4630-K9

 

CDM-4650-K9

 

CE-507

Only if used as part of a CDN.

CE-507-K9

Only if used as part of a CDN.

CE-507AV-CDN

 

CE-507AV-CDN-K9

 

CE-560

Only if used as part of a CDN.

CE-560-K9

Only if used as part of a CDN.

CE-560AV-CDN

 

CE-560AV-CDN-K9

 

CE-590

Only if used as part of a CDN.

CE-590-K9

Only if used as part of a CDN.

CE-590-DC

Only if used as part of a CDN.

CE-590-DC-K9

Only if used as part of a CDN.

CE-7320

Only if used as part of a CDN.

CE-7320-K9

Only if used as part of a CDN.

Problem Description

Cisco Application and Content Networking System (ACNS) Software Release 5.0 includes significant changes and enhancements from Cisco ACNS Software Release 4.2, thereby affecting how customers store and distribute their content. Customers who only use caching functions will not have to make many changes to their system to upgrade. Customers who use the Content Delivery Network (CDN) features will need to migrate their content and follow the migration guide. If CDN customers do not follow the Migration Guide and just upgrade the equipment, the CDN will be nonfunctional.

Refer to the full documentation and the Cisco ACNS Software Migration Guide for more in-depth information.

Background

ACNS 5.0 changes the way that data is acquired and distributed as well as how clients are directed to Content Engines. These changes require that data be ported from the CDM to an origin server prior to the migration. In addition, URL formats have changed and additional hardware may be required. Before proceeding with an ACNS 5.0 upgrade on a device in a Content Delivery Network, the Cisco ACNS Software Migration Guide must be followed.

Problem Symptoms

If a device running ACNS 4.x and utilizing CDN features is upgraded to 5.0, the network will become nonfunctional. The content will no longer reside on the CDM to where the old URLs are pointing, so clients will not be able to retrieve pre-positioned content.

Content Engines that act as caches will upgrade to ACNS 5.0 without issue.

Workaround/Solution

Follow the Cisco ACNS Software Migration Guide. Migration to ACNS 5.0 must be planned. Additional hardware may be required.

Required Software and Hardware

  1. When you use Cisco ACNS Software Release 5.0 for pre-positioning content, you must first put that content on an origin web server or FTP server to which the content engines have access. You need to deploy the server and ensure that it has sufficient capacity for all the content that you want to put on the CDN. The CDN can pre-position content from more than one web server or FTP server. You will need to place root content engines with sufficient network link speed to the origin server.

  2. If you plan to use content routing (as opposed to WCCP or proxy configuration of clients), you need one or more content routers. Cisco recommends two or more (up to eight) for reliability and redundancy.

  3. You need a web server or FTP server to host the manifest file. This can be the same server that is used to host the content.

  4. If you plan to use content routing, you need access to a DNS server. The content router will respond for a domain, but it must be configured as authoritative (NS records must return the IP address of the content router) in a higher-level DNS server. For example, if the domain cdn.cisco.com will serve content from the CDN, the DNS server for cisco.com must have an NS record identifying the content router as authoritative for cdn.cisco.com. Therefore, you need to have access to edit the DNS configuration of the higher-level DNS server (in this example, cisco.com).

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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