Why should I add URL parameters where Meta Robots NOINDEX available?

[CommercePundit]

Today, I have checked Bing webmaster tools and come to know about Ignore URL parameters.

Bing webmaster tools shows me certain parameters for URLs where I have added META Robots with NOINDEX FOLLOW syntax.

I can see canopy_search_fabric parameter in suggested section. It's due to following kind or URLs.

http://www.vistastores.com/patio-umbrellas?canopy_fabric_search=1728

http://www.vistastores.com/patio-umbrellas?canopy_fabric_search=1729

http://www.vistastores.com/patio-umbrellas?canopy_fabric_search=1730

http://www.vistastores.com/patio-umbrellas?canopy_fabric_search=2239

But, I have added META Robots NOINDEX Follow to disallow crawling. So, why should it happen?

[Nobody1560986989723]

I'd say the first thing to say is that NOINDEX is an assertion on your part that the pages should not be indexed. Search Bots have the ability to ignore your instruction - it should be rare that they do ignore it, but it's not beyond the realms of probability.

What I would do in your position is add a disallow line to your** robots.txt** to completely disallow access to

/patio-umbrellas?canopy_fabric_search*

That should be more effective if you really don't want these URLs in the index.

[CommercePundit]

I'm agree to deal with Robots.txt. But, my website have 1000+ attributes for narrow by search & I don't want to disallow all dynamic pages by Robots.txt.

Will it flexible for me to handle? And answer is no!

What you think about it?

[Nobody1560986989723]

I suggest then you use pattern matching in order to restrict which parameters you don't want to be crawled.

http://support.google.com/webmasters/bin/answer.py?hl=en&answer=156449

[CommercePundit]

I hope, following one is for me... Right?

Disallow: /*?

[Nobody1560986989723]

Don't disallow: /*?

because that may well disallow everything - you will need to be more specific than that.

Read that whole article on pattern matching and then do a search for 'robots.txt pattern matching' and you will find some examples so you can follow something based on others' experiences.

[CommercePundit]

This is good for me... Let me drill down more on that article.... I'll check in Google webmaster tools before make it live on server... So, It may help me more to achieve 100% perfection in task!