We are migrating from one service provider to another one both having MPLS connection to our DC.
Usually when we migrate a site, once the new service provider advertises the LAN subnet the old service provider's links stops working and new provider's link takes over..
This time, the old service provider is advertising a subnet 10.1.x.x/16 network to the DC.But we are planning to migrate only 10.1.2.x/24 subnet of the major subnet to new service provider. Rest of the sites in 10.1.x.x/16 will use the old provider itself.
I feel like this won't cause any issues, but can any of you guys confirm if this is going to be ok and none of the other sites won't go down.