Canonical Domains
The canonical domain is the preferred domain for your website. This matters when visitors can reach your site through different domains. Even though most people know that http://www.mysite.com and http://mysite.com are the same website, search engines see them as two different websites. That's why it's important to tell search engines which domain you prefer for your site.
The WWW domain and the non-WWW domain are equal when it comes to SEO. The important thing is to pick one and stick with it across your site. That means if you pick the non-www domain, any absolute links to other pages on your site should use the non-www domain.
When you have multiple CNAME records for your domain, use the Domains subtab on the website setup record to set the primary URL and define any aliases, so visitors using any alias are redirected to your site's primary URL. Also, search engines treat this as a 301 redirect from any alias to your site's primary URL.
To set the canonical domain for your site:
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Go to Commerce > Websites > Website List.
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Click the edit link for the website for which you need to establish a canonical domain.
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Select the Domain subtab.
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In the list of Domains, locate your primary domain.
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In the Primary Web Site URL column for your primary domain, check the box to indicate that this is the primary domain for the site.
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Enter a new record in the table for each domain alias for which you have a CNAME record.
Note:Any domain alias you enter here must have a corresponding CNAME DNS record defined with your domain provider.
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Click Save.
When visitors or search engines access your site with any of the domain aliases that you specify here, they are automatically redirected to the URL that you have marked as the primary website URL.