Hi @abjain ,
IP "/32" addresses refer to the actual IP address. So if your IP address is say 10.11.12.13 and you are using a subnet mask of /24 (or 255.255.255.0) then you would expect a route in a routing table/RIB to instruct a router (or in the case of ACI, a leaf switch) something like 10.11.12.0/24 via <some-next-hop-IP> - which assumes that EVERY IP address in the range 10.11.12.0 - 10.11.12.255 is reachable via the same path.
ACI does NOT make that assumption, and stores the actual IP addresses of the host in a table - when you are referring to the actual IP address of a host, it us often referred to as the "/32" address because you have are considering all 32 bit of the address - not just the first 24 (as you would with the previous example - 10.11.12.13/24)
IPv6 addresses are 128 bit long, so for an IPv6 explanation, just re-read the above and swap 32 for 128.
RedNectar aka Chris Welsh.
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