[c-nsp] /31 network

[Rodney Dunn]

There were some bad problems with that.

I wouldn't use it.

It was originally for the PPPoE type setups IIRC to preserve address
space.

For routed P2P use /31's.

On Wed, Jul 02, 2008 at 01:08:52PM -0700, Kevin Graham wrote:
> 
> > has anyone used /31 network instead of /30? I believe this is recommended to
> > use /31 network? Need expert comments.
> 
> Support still seems very limited, but on a similar thread, has anyone toyed
> with the 'ip unnumbered for Ethernet' feature? Initially it was just option-82
> magic, but I noticed there's now also a "poll" option to support non-DHCP
> hosts:
> 
> http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/37sg/configuration/guides/unnumber.html
> 
> There's the single message from a CLI example:
> 
>      "Warning: dynamic routing protocols will not work on non-point-to-point
>      interfaces with IP unnumbered configured."
> 
> ...though without more discussion on the underlying functionality, that's
> terribly vague (ie. would explicit neighbor configurations remedy the
> limitiation?).
> 
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