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[Quantum] Why is 'subnet' introduced in Quantum API v2?


I am confused by the existence of both 'network' and 'subnet'. According to
v2 API spec[1], subnet is introduced to support IPAM capabilities. Can
anyone elaborate it to me? For example, what is the benefit of creating 1
network and 2 subnets by comparison with creating 2 networks that
implicitly has one and only one subnet for each?

I do know that the original network did not support IP overlapping before
subnet is introduced. But it is just an implementation issue, right?


[1] https://wiki.openstack.org/wiki/Quantum/APIv2-specification

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