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Thirty-one-bit subnets were first proposed in RFC 3021, which was primarily motivated by the potential for public address space conservation. Recall that shrinking a /30 subnet to a /31 effectively doubles the number of point-to-point links you can address from a finite range. Cisco IOS has supported /31 subnets for point-to-point links since release 12.2(2)T. A thorough explanation of the feature is presented here.

We can put this theory into practice by addressing a point-to-point connection between two routers as Note that this even applies to Ethernet interfaces, technically a broadcast medium.

Router1(config)# interface f0/0 Router(config-if)# ip address
% Warning: use /31 mask on non point-to-point interface cautiously
Router1# ping
Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/16/20 ms
Router1# show ip route
... is subnetted, 1 subnets
C is directly connected, FastEthernet0/0


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