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RE: Addressing PE/ CE Links - 2547

  • From: "Julian Breen" <Julian.Breen@comindico.com.au>
  • Date: Wed, 25 May 2005 16:09:25 +1000
  • Resent-Date: Wed, 25 May 2005 02:35:54 -0400
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  • X-OriginalArrivalTime: 25 May 2005 06:09:25.0571 (UTC) FILETIME=[4D543930:01C560F0]
  • X-Scanned-By: MIMEDefang 2.45

All respect John,

Question was:
"Just wondering what is the general experience and common practice on a
large
scale, RFC1918, customer or registered?"

IMHO I think it's a waste to use 20k registered links *if* you can use
RFC1918 for VPNs.  Then again, I think it's better to have a policy than
not to, so if your policy is to use registered, and I can see why you
might... it's better than no policy at all.


Regards,
Julian Breen
SPTCOM


-----Original Message-----
From: josmon [mailto:josmon@rigozsaurus.com] 
Sent: Wednesday, 25 May 2005 2:08 PM
To: mpls-ops@mplsrc.com
Subject: Re: [MPLS-OPS]: Addressing PE/ CE Links - 2547

On Wed, May 25, 2005 at 12:36:07PM +1000, Julian Breen wrote:

Let me preface with one of my mantras:
      Your net, your rules.  My net, my rules.

[...number pt-to-pts in high 10/8 RFC 1918 space...]
> If the customer has reserved the whole 10-dot range globally, as has 
> been the case, we ask them to move to a 172 range.

Why should *they* move?  They pay *you* to do things for *them*...

Or what about the time when a customer is as big, or bigger than you?
Case in point:  

  I've recently run into a situation where the customer already has
  20k+ sites -- all numbered in 10/8 space.  They certainly aren't going
  to renumber the sites.  


Just because the case is rare, doesn't mean it doesn't play havoc when
you run up against it.  Using registered address space for such links
means I never have to run into the situation.

[...]
> Don't waste global address space on private links.

I don't think that it is a waste to use a unique addresses to identify
unique links on my network.  I'm strange that way.

I'm glad that your addressing works for the market you serve.
Please recognize that there are legitimate reasons for doing things in
other fashions.

The best part of this whole 'net thing -- we all get to play by our own
rules within our own network.  However, blanket statements about policy
don't always translate between those diverse networks.

	John

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