Ascend Archive
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Re: (ASCEND) Low bit/high bit subnets
On Mon, Aug 11, 1997 at 09:51:46AM -0400, Phillip Vandry wrote:
> > I was wondering if the Ascend products will properly
> > route 'illegal' subnets such as the 0-bit and the high-bit
> > subnets. For example, if I have /27 network, can I use:
> >
> > 208.133.27.0/27 (for IP's 208.133.27.1 - 208.133.27.31)
> >
> > or
> >
> > 208.133.27.224/27 (for IP's 208.133.27.225 - 208.133.27.254)?
>
> I've been told by Ascend and by Cisco to be afraid to do that with their
> respective products, it violates specs all over the place, etc..
You probably hit some old natives who are in the biz since '85 ;-)
> I beleieve that's a load of crap. There's nothing wrong with doing that.
> The only thing that stops you is an obsoleted RFC.
More clearly, the only situation where the limitation makes any sense
is the use of a classful routing protocol, where a classful router can't
make a difference between the net base of the /24 and f.i. the subnet zero
of a /27 as well as between the broadcast of the /24 and the broadcast of
the all ones subnet of the /27. In most cases this isn't a
problem either, the most problematic thing is that vendors thought they
must prevent users from configuring these nets and thus made them unusable
which spread like most other deseases.
FMI, see the excellent http://www.3com.com/nsc/501302.html
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