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There is an interesting Google Webmaster Help thread of an example of what is called a cyclic redirect. Basically, when you point URL A to URL B and have URL B point back to URL A. It is a cyclic nature and can cause issues for Google and other search engines.
The webmaster came in asking "why is GoogleBot reporting a "Redirect error" on all pages it crawls? promptly saying: not indexed."
The issue was he had both http://www.max.grenkowitz.net/ and http://max.grenkowitz.net/ resolve to the same page. As JohnMu of Google explained:
A) http://www.max.grenkowitz.net/?topic=10 .. containsB) http://max.grenkowitz.net/?topic=10 ... redirects back to A)
For our systems, this looks like a cyclic redirect, making it hard for us to follow and pick the right URL to actually index.
One way to resolve that could be to use the final URL as the preferred canonical one.
The webmaster fixed it, as far as I can tell from his source code, so Google should pick up on the change soon.
But sending Googlebot in circles might not be a great idea.
Forum discussion at Google Webmaster Help.
Comments:
Jey Pandian
02/25/2011 12:23 pm
Barry, I wanted to thank you for covering Google's webmaster forums. Every day in the morning when I wake up, I always look forward to seeing what's new from you. Thank you again for covering these spaces.
Barry Schwartz
02/26/2011 08:32 am
Your welcome.
SEO Professionals
08/12/2011 03:36 pm
Bad links may harm your website search engine ranking and leave your website visitors with a less than pleasurable experience.