Open Stack

I am trying to understand the current implementation of allowed address
pairs extension.
With allowed address pairs I can do something like this

*neutron port-create net1 --allowed-address-pairs type=dict list=true
ip_address=<ip1>*

*neutron port-create net1 --allowed-address-pairs type=dict list=true
ip_address=<ip1>*

Now neutron lets you boot a vm on a port with fixed-ip as "ip1"

 *neutron port-create --fixed-ip ip_address=<ip1> net1*

and now you can do a nova boot using the created port.
Should nova boot be allowed on such a port ? What are the use-cases where
someone would do something like this ?

Regards,
Sayaji
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