I have a domain (
example.com) and some subdomains (e.g.,
example.com to Google and Bing Webmaster Tools. I added
sd1.example.com/sitemap (with a redirect) for this site on Webmaster Tools.
Then I added
sd1.example.com as a site in Webmaster Tools and added
sd1.example.com/sitemap for this site. I did this for all subdomains.
1) Now, is there any benefit for adding subdomains and their sitemaps twice? Or are there any disadvantages?
2) Which one is better? (from an SEO point-of-view)
3) If I want to change
example.com domain to
newdomain.com, should I redirect URLs separately in Webmaster Tools?
Clarifying the above questions:
1) For example, is there any penalty from Google in adding a sitemap twice in two websites? Does Google show two results with the same URL (because I submitted a URL twice)?
2) Is it better to have one indexed result for same URL or two?
3) After moving
newdomain.com in Webmaster Tools, is there any need to do it for subdomains too?
I need to have separate Webmaster Tools sites for subdomains. Before, I added sitemaps to both main domain and subdomain in Webmaster Tools. Now, that I have changed main domain, I must remove old subdomains from Webmaster Tools. In this situation sitemaps vanish and I do need to submit sitemap for new subdomains. Will doing this cause Google to lose data for my subdomains?