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Root domain or sub domain
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When I crawl my site as a root domain, I get more errors is my campaign than when I set my site as a sub domain.
Which one is the correct way: root domain or subdomain. My site is www.aa-rental.com
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I can't agree with Anirban's suggestion. A 301 redirect would be the superior solution.
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You should put a canonical tag on http://aa.rental.com point to http://www.aa.rental.com. When search engines bot sees the canonical tag it will crawlyour main site http://www.aa.rental.com and hence no dulicate content issue.
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Your site is published under multiple domains:
Notice both of the above links brings up the same content on your site but under different URLs. That should not happen.
http://seomoz.org/q/root-domain-or-sub-domain
Notice if you try the above link for this Q&A response, the URL is changed to add the "www." subdomain. That is what should happen if you have a site presented on the www subdomain.
You need to decide how you wish to present your site, with or without the www subdomain. Once that decision has been made, it needs to be enforced with server side code. Once that issue is resolved, the particular crawl issue you mentioned should be resolved.
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