Re: [RRG] Thoughts on the RRG/Routing Space Problem

[Jari Arkko <jari.arkko@piuha.net>]

Iljitsch van Beijnum kirjoitti:
> On 30 nov 2007, at 11:00, Stephen Sprunk wrote:
>
>> Along your lines of a split, I like the idea of using 4000::/3 for
>> LISP-mapped EIDs and deprecating PI space in 2000::/3.  It's a bit
>> tougher to apply the same split to v4 since there won't be any /8s
>> left by the time a solution is standardized...
>
> Hm, if that's true, does it make sense to even bother working on all
> of this for IPv4?

Indeed. There simply isn't space to do this.

> But you could use IPv6 for locator space even for IPv4 end-user PI
> space...

Right.

>
> And reclaiming 240.0.0.0/4 for use as locator addresses within ISP
> networks seems possible for at least some values of "possible".

Mumble. I doubt this. First of all, this a small amount of space.
Secondly, all routers in the path would have to support 240/4 address
spaces and not drop the packets.

> However, I disagree that it's necessary or even useful to make a
> syntactical distinction between existing PI space, the new type of PI
> space and locator space. Anything that's in the BGP tables is either
> existing PI space or locator space. Which of the two isn't terribly
> interesing. Anything that's not in the BGP tables is either unused or
> new PI space so it can safely be routed to an encapsulation device.
The crux of the issue is whether there's any form of pushback for users
and organizations to insert their identifier space into the global
tables. If there is none, and there is no incentive that makes users
avoid that, the chances are that no amount of additional protocols will
actually solve the fundamental problems we have today.

(In any case, one syntactical difference is IPv6 vs. IPv4. If your
identifiers come from IPv6 space, they cannot be inserted to the IPv4
tables...)

Jari


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