I'm in a situation where a subnet at a facility on the other side of the country is stepping on another subnet on the network. Thus, I must re-ip the devices on the offending subnet. My plan is to add a secondary default route to the gateway (Nexus 5K) and then bring up the access layer switches in sequence at which point I will then remove the original subnet. My question is- Will this process cause impact to the existing subnet? I want to avoid any disruptions if possible.
