[j-nsp] iBGP and IPv6

[Jonathan Call]

Correct.  The BGP route for the router's IPv4 loopback is marked as hidden/unusable. It does not show up in show route extensive output.

I'm surprised/annoyed that either one shows up at all. From what I've read in the JNCIP study guide, when router1 is announcing its loopback route (or any other route) via IBGP to router2, router2 shouldn't be re-advertising it back to router1 via IBGP. At least in the case of the IPv4 address it gets marked as hidden/unusable by router1. 

Jonathan

Subject: Re: [j-nsp] iBGP and IPv6
To: lordsith49 at hotmail.com; juniper-nsp at puck.nether.net
From: mark.tinka at seacom.mu
Date: Wed, 15 Apr 2015 17:06:08 +0200


  
    
  
  
    

    

    On 15/Apr/15 16:24, Jonathan Call
      wrote:

    
    
      
      
      Here is the output of 'show route extensive'.
        Hopefully it shows up formatted properly this time.
    
    

    It copied okay for me this time (maybe because it's HTML e-mail, not
    sure).

    

    However...

    

    

    
      
         
          
            router1> ...oute 2001:db8:4000::1 extensive
          
        
      
    
    

    I thought the IPv4 entry was the one that came up as Unuseable?

    

    Mark.