Nice simple one. I think.
I have inherited a network in the following state. A single subnet linked by various cisco switches and routers typically cisco3500 etc.
I am currently replacing our ISP and as a result changing the gateway for the clients. This means the existing gateway will become defunct.
I cannot get into most of the switches on our network but believe that the gateway may be specified.
So two questions bearing in mind that the only traffic I want to go out through the new gateway will be users internet traffic.;
1) Do I need to specify the new gateway in my switches on the network ?
2) If the existing soon to be turned off gateway is specified in the switches etc will this cause any network issues once the existing gateway is removed ?