If I have a /30 subnet, say x.x.x.0/30, I will use .1 & .2 and cannot use .0 since it is subnet and .3 cannot be used since it is a broadcast ip address.
But, instead, if I further subnet the /30 to /32, I will get four ip addresses, .1, .2,.3,.4/32; can I use all of them for four different loopbacks on four different L3 interfaces?
Thanks in advace :-)
I think that Arivudainambi's answer covers your question, just to elaborate more, we can also use a /31 prefixes, in order to conserve IP address space on the Internet, a 31-bit prefix length (255.255.255.254) allows the use of only two IP addresses on a point-to-point link. Previously, customers had to use four IP addresses or unnumbered interfaces for point-to-point links.
IP directed broadcast not allowed with 31 bit mask (when entering a /31 address ip directed broadcast will be immediately disabled).
NOTE no ip directed-broadcast is the default on modern IOS and thus it might not appear in the configuration.
When entered on a non point-to-point interfaces the following error occurs: % Warning: use /31 mask on non point-to-point interface cautiously.