Re: [OSPF] Feedback regarding draft-ietf-ospf-ospfv3-autoconfig

Hi Rama,

> On Jan 23, 2015, at 10:51 PM, Rama Darbha <rama.h.darbha@gmail.com <mailto:rama.h.darbha@gmail.com>> wrote:
> 
> A. Lindem and J. Arkko,
> 
> Some feedback on this draft. In section 5:
> 
> "5.  OSPFv3 Router ID Selection
> A pseudo-random number SHOULD be used for the OSPFv3 Router ID."
> 
> I think it would be valuable to describe why a pseudo-random number should be chosen. The [OSPFv3] document doesn't make any reference to selecting a pseudo-random number, so it would be good to justify the reasoning. Something along the lines of:
> "The router id in OSPFv3 is a 32-bit value [OSPFv3]. As outlined in [OSPFv3], a router running OSPFv3 may not have an IPv4 address to automatically select as the router id. Since auto-configuration cannot guarantee a unique router id as outlined in [OSPFv3], a pseudo-random router id is the solution for OSPFv3 autoconfiguration to prevent router id collision.”

Since the whole draft is about autoconfiguration, I would think this is obvious that the router would not have an IPv4 address. We also state:

   An OSPFv3 router requires a unique Router ID within the OSPFv3
   routing domain for correct protocol operation.  An OSPFv3 router
   implementing this specification will select a router-id that has a
   high probability of uniqueness.

If I did add something, it would be:

   Existing Router ID selection algorithms (section C.1 in [OSPFV2] and 
   [OSPFV3]) are not viable since they are dependent on a unique IPv4  
   interface address which is not likely to be available in auto configured 
   deployments.

> 
> 
> 
> Also, there's a small formatting error. Section 7.2 and 7.4 are not marked correctly as headers.

This really isn’t a formatting error. The problem is that heading is too long to fit on one line. I think I will shorten the headings to fit on a single line to avoid confusion. 

> 
> 
> Regards,
> Rama
> 
> -- 
> -----
> Rama Darbha
> rama.h.darbha@gmail.com <mailto:rama.h.darbha@gmail.com>
> 919 410 7262
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