>It doesn't work in Cisco routers. Only in quite recent releases, and I can't tell you numbers offhand. Might need to be an ISP release train.
> >""Carroll Kong"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... >> 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=27826&t=27742 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
