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the openstack install guide says that the provider network needs an ip but then uses a special config without an ip

Hello, Can any one please tell me why the openstack guide says that we need to configure a second interface using this as an example : Provider on with gateway

           This network requires a gateway to provide Internet access to instances in your OpenStack environment.

but then in the next page they tell you to :

"The provider interface uses a special configuration without an IP address assigned to it. Configure the second interface as the provider interface:

Replace INTERFACE_NAME with the actual interface name. For example, eth1 or ens224.

Edit the /etc/network/interfaces file to contain the following:

The provider network interface

auto INTERFACE_NAME iface INTERFACE_NAME inet manual up ip link set dev $IFACE up down ip link set dev $IFACE down "

How to do this ?? plz help