title: BGP use of looking glass
body: <p>What are the uses of a looking glass server to BGP protocol? </p>
  
  <p>What specifically does BGP look up on a looking glass server during path selection? Is is looking up the rest of the path-- beyond what it sees on on the path vector delivered to it?</p>
  
  <p>Maybe a naive Q-- however i couldn't make much out of it. </p>
  
  <p>TIA</p>