Law of subnets is a tradeoff. Bigger subnets, have higher
efficiency, at the cost of bigger broadcast domains. Smaller subnets have
abysmal efficiency, at the benefit of smaller broadcast domains.
/31 is a new RFC proposed rule which eliminates the loss of
effiency of 50% to.. 0%.
/30 has 2 usable addresses but loses 2 for broadcast and
network. So, you need 4 ips to make the subnet, but you only can use
2. 50% efficiency. /31 is going to let you take 2, and use 2, and ignore
the broadcast and network need. This is ideal for point to point.
At 08:32 AM 11/30/01 -0500, VoIP Guy wrote:
>Maybe I'm missing something, but there are only 2 useable addresses in a
>/30, and only 2 interfaces participating in a point-to-point link, so how
>are there 50% of the addresses wasted.
>
>Steve
>
>
>""MADMAN"" wrote in message
>[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > Point to point connections, with a /30 you waste 50% of the
> > avaivalable addresses.
> >
> > Dave
> >
> > Nicolas FEVRIER wrote:
> > >
> > > Hi group,
> > >
> > > I'm puzzled by the use of /31 subnets...
> > > Anybody can explain me the benefits of such a subnet on an interface ?
> > >
> > > Thanxx.
> > >
> > > Nicolas.
> > --
> > David Madland
> > Sr. Network Engineer
> > CCIE# 2016
> > Qwest Communications Int. Inc.
> > [EMAIL PROTECTED]
> > 612-664-3367
> >
> > "Emotion should reflect reason not guide it"
-Carroll Kong
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=27810&t=27742
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