Re: Subnet Size for BGP peers.

Doug McIntyre wrote:

On Thu, Jul 30, 2009 at 12:22:27AM -0400, Barton F Bruce wrote:

...

So what is wrong with a /31? We use /30s but if you are short on IP space, look at using /31 rather than /30 links. Cuts your space usage in half.

/31's are only defined for point-to-point links.

Ethernet isn't considered PtP in general..

Many devices won't accept a /31 on anything but a PtP WAN media type link. (or not at all).

Since it isn't PtP, one also has to allow the customer to connect multiple devices.