Global Routing Prefix vs Subnet ID vs Interface ID (IPv6 address)

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Global Routing Prefix vs Subnet ID vs Interface ID (IPv6 address)

In: Technology

BIG IIRC from a few years ago.

GRP: General Routing information to get you rolling towards a particular site
SubnetID: Information that gets you to a particular subnet
InterfaceID: Gets you to a particular connection on a subnet.

Think of it like snail mail.

GRP is the State and City, Subnet ID is the particular neighborhood, and Interface ID is the particular house.

The routing prefix is the IPv6 prefix that’s unique to a particular site such as a business or home. It can be 48 to 64 bits. For businesses 48 bits is recommended and for a home user 56 bits.

The subnet ID allows the business or home user to have IPv6 in multiple LANs. A 48 bit prefix can be used on up to 65536 LANs, a 56 bit prefix on 256 LANs and a 64 bit prefix on one single LAN.

The routing prefix together with the subnet ID is 64 bits.

The interface ID is the remaining 64 bits which are used for addressing within each LAN.

https://en.wikipedia.org/wiki/IPv6_address#Unicast_and_anycast_address_format