Why do I get % Warning: use /31 mask on non point-to-point interface cautiously
when I use a /31
subnet mask over Ethernet, and why am I not able to ping from R1 to R2 when both the interfaces have accepted the /31
subnet mask and they both are directly connected, and in which conditions can I use /31
without any trouble?
R1#show running-config interface fastEthernet 0/0
Building configuration...
Current configuration : 107 bytes
!
interface FastEthernet0/0
ip address 216.21.5.1 255.255.255.254
shutdown
duplex auto
speed auto
end
R2#show running-config interface fastEthernet 0/0
Building configuration...
Current configuration : 107 bytes
!
interface FastEthernet0/0
ip address 216.21.5.2 255.255.255.254
shutdown
duplex auto
speed auto
end
Topology: