Here's a guess.  The BGP community attribute is optional, yet transitive. 
This means that a particular implementation of BGP on a router may not use
or understand the concept of communities.  However, because the attribute is
transitive, it will be forwarded along to other neighbors who may be able to
to use it.

I'm sure someone will correct me if I have the wrong.

Regards,
John

>  What does this mean :
>  
>  "IF A ROUTER DOESNOT UNDERSTAND THE CONCEPT OF COMMUNITIES IT WILL DEFER
TO THE NEXT ROUTER"
>  
>  Please help.
>  Thanks
>  Manish 
>  
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