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CDN migration best practices

6:42 pm on Sep 19, 2016 (gmt 0)

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Hi everyone,

I've searched WebmasterWorld and the net in general, but can't seem to find any good resources for best practices concerning migration from one CDN provider to another (and in my case, migrating from a complicated CDN domain configuration to something simpler and more manageable).

I'm try to help out a large traffic website that uses CDNs for a number of asset types (images, static, shared, embeds, etc, but not complete webpages) simplify their structure, and perhaps give some benefit from an SEO perspective, but I don't have a lot of expertise in the area. A couple of questions:

1 - Is there any merit to the idea that there would be an SEO benefit to having the CDN on a subdomain of the site's main domain (eg: img-cdn.maindomain.com) compared to a separate domain (eg: img-cdn.maindomainCDN.com) - I understand external sites who may link directly to some asset types would provide a small benefit, but this would be very rare, so beyond this I see little benefit. I may be wrong in that currently we do not see much traffic from image search, and this may be because we currently host the images on a completely separate domain (maindomainCDN.com).

2 - Would it be best practices to 301 all asset URLs from an old CDN to a new - I think by default yes, but in truth there's likely little SEO risk, as these assets are not the actual resources that rank in search engines (as stated above we don't currently receive significant traffic from image search, if this were not the case I could see more reason to 301).

3 - Are there any other steps to follow for a migration (I understand we should retain our filenames and paths as best as possible) that I'm simply not aware of, or a resource someone could point me to?

Thanks very much!