How looking glass server output should be decoded?

Last updated on November 22, 2022

        I am trying to understand BGP and looking glass server concepts. The IP address of <strong>stackexchange</strong> is <code>198.252.206.140</code>. Now, I use the looking glass server from <a href="http://lg.bt.net/" rel="nofollow noreferrer">here</a>. 

• I selected BGP network and clicked on submit button.
• I give the starting location of the looking glass server as Australia and try to trace the traffic till stackexchange. So, I give the IP address as 198.252.206.140.

Now, this is the output I get.

BGP routing table entry for 198.252.206.0/24, version 315807603
Paths: (4 available, best #3, table default)
  Advertised to update-groups:
     15     19    
  4637 174 25791, (aggregated by 25791 198.252.206.3)
    134.159.98.29 (metric 693) from 195.206.69.80 (195.206.69.80)
      Origin IGP, metric 0, localpref 90, valid, confed-internal, atomic-aggregate
      Community: 3300:4 3300:1804 3300:1999 3300:3070 3300:3071
  4637 174 25791, (aggregated by 25791 198.252.206.3)
    134.159.208.153 (metric 693) from 195.206.69.81 (195.206.69.81)
      Origin IGP, metric 0, localpref 90, valid, confed-internal, atomic-aggregate
      Community: 3300:4 3300:1804 3300:1999 3300:3070 3300:3071
  4637 174 25791, (aggregated by 25791 198.252.206.3)
    134.159.188.77 from 134.159.188.77 (202.84.219.195)
      Origin IGP, localpref 90, valid, external, atomic-aggregate, best
      Community: 3300:4 3300:1804 3300:1999 3300:3070 3300:3071
  4637 174 25791, (aggregated by 25791 198.252.206.3), (received-only)
    134.159.188.77 from 134.159.188.77 (202.84.219.195)
      Origin IGP, localpref 100, valid, external, atomic-aggregate  

As I understand currently, the numbers 4637, 174 and 25791 are the as numbers of the route. Also, as per the output, I get 4 paths and the best path is #3. So what is that I have to look in this output to see why #3 is the best path or route? Or in other words, how to decipher this output from the looking glass server? I went through this question which helped me understand the concepts. But am still looking for a way to decipher the output from the looking glass server.