Links (Datacenter)
From the blueprint, navigate to Staged > Physical > Links to go
to the Links view. 
Many link operations are performed from the Topology view, and some can also be performed directly in the Links view. See the following sections for more information.
Example of how links are assigned
Links Example
In this example, each link is assigned a unique /31 subnet from the IP Pool.
The smaller /31 IP is assigned to the spine interface.
he larger /31 IP is assigned to the leaf interface.
Subnets are assigned in increasing order in a spine-major order.
That is, the links between spine1 and all leafs (in ascending order) are assigned subnets first.
The links between spine2 and all leafs are then assigned subnets, and so on. 