/127 between routers?

[Pekka Savola]

On Tue, 5 Jan 2010, Andrew Alston wrote:
> We use /127s all over the place on point to point links with no issues
> (We went this route after considering what was said in the latest link
> Janos posted below)
>
> Haven't really found any drawbacks with this yet

If you're using SDH or other links where the link type is 
'point-to-point' (in BSD/Linux 'ifconfig' sense, i.e., there is no 
neighbor discovery for link-layer address discovery), /127 is probably 
a good idea considering the tradeoffs.  In practise, nobody has 
implemented subnet-router anycast address mechanism that was a main 
reason for writing RFC3627.

If you only use Ethernet, I don't see much point in /127 specifically, 
other prefix lengths are fine as well.

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings