Subnet Size for BGP peers.
merlyn at geeks.org
Thu Jul 30 15:22:24 CDT 2009
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).
More information about the NANOG