[nsp] /30 over WAN links

[Rubens Kuhl Jr.]

Any scenario that would require or prefer numbered links nowadays ?


Rubens

----- Original Message ----- 
From: "Ejay Hire" <ejay.hire at isdn.net>
To: <limmer at core.com>; <cisco-nsp at puck.nether.net>
Sent: Friday, February 06, 2004 1:58 PM
Subject: RE: [nsp] /30 over WAN links


> On a related note, Cisco added support for /31's on serial
> links somewhere in 12.2  If you are tight on IP space but
> want to stick with numbered links this might be the way to
> go.
> 
> -Ejay
> 
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net 
> > [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> Steve Lim
> > Sent: Friday, February 06, 2004 9:33 AM
> > To: cisco-nsp at puck.nether.net
> > Subject: [nsp] /30 over WAN links
> > 
> > Hello all,
> > 
> > It has been an age old policy at my company to place
> a 
> > /30 over the WAN 
> > links ever since who knows when, and I've never really
> questioned it. 
> > But now, we've merged with another company, and they do
> not 
> > follow such 
> > a policy at the Access Layer. In fact, they use a /29 (or
> shorter 
> > prefixes, if customer requires more IPs) over the WAN
> links, and  use 
> > the IPs not already used by the respective end interfaces
> for 
> > hosts/devices on the remote/customer end.
> > 
> > I had assumed that most, if not all companies use
> /30s. 
> > So this came as 
> > a surprise. But more importantly, I can't come up with a
> good 
> > reason why 
> > we use /30s either.
> > 
> > My questions:
> > 
> > 1. At the Access Layer, what are the benefits of using
> /30s, over 
> > subnets with shorter prefixes.
> > 
> > 2. Are there administrative benefits to such a policy?
> > 
> > 3. Are there routing or switching benefits to such a
> policy?
> > 
> > 4. Is it a best practice policy?
> > 
> > Thank you for comments.
> > 
> > SL
> > -- 
> > <><><><><><><><><><><><><><><><><><><><>
> > Steve Lim - Network Engineer (Michigan)
> > Corecomm -An ATX Communications Company
> > Support Bacteria, it's the only culture
> > everyone has in common. -limmer
> > 
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