I have an interface in a Cisco 6504 that has been assigned an entire class C address space (255.255.255.0). We have only used about 20 of these addresses in the low end of the range. I would like to use one of the unused address I have and assign it to another interface on the 6504 (have a blade with 24 SFP) so I can connect a new switch many miles away on a fiber optic cable. The second switch would be also be assigned an address from the same class c range sort of like when you do a serial t-1 connection with a 252 subnet.
Will I have to re-subnet the original interface that has the class c in order to make available more separate networks from which I can use the ip's on different interfaces on the 6504? If I do, is the re-subnet procedure disruptive to the clients connected to that interface?
What I am ultimately trying to accomplish is connect a 3560E to the 6504 via fiber optic connection straight bewteen the devices. The 3560 will be located at a facility owned by another local goverment and they will be connecting devices from their network to the 3560 for connection to systems in our neetwork. The potential also exists though for that other agency to use the link between the two switches as an alternate Internet connection for them, as our 6504 is also our border gateway device.
I am sure I have confused the lot of you, so I apologize profusely for doing so, Thanks.