Presently we have two Layer 3 Cisco switches doing DHCP for our network, with a shared HSRP address.
We are migrating to a Gigabit infrastructure - I have installed 2 new Layer 3 Cisco switches & migrated half our infrsatructure to these new switches. The old switches are connectesd to the new switches (presently a single Etherchannel but will soon be full mesh)
I want devices that are connected to these new switches to be given the HSRP address of these switches as their default gateway, & devices that are connected to the old switches to still get the HSRP address of these switches as their default gateway.
At the moment, traffic between subnets has to go via the old switches, even if both devices are connected to the new switches (as all devices have a default gateway of the old switches - I believe so anyway; when I do a trace I see the IP of the old switches)
It is easy enough to configure, but with the way DHCP works, I don't want devices on one side being given the default gateway for the other side. I would hope that when the new switches receive a DHCP request, they will simply reply to it & not send it on to the old switches, & vice versa. So the switches will only receive DHCP requests for their side, & will not even receive requests for the wrong side.
Does anyone have this setup & can they advise if it works no problem?
Please see diagram: example topology - devices connected to the switches on the left should get a default gateway of .1, & devices on the right should get a gateway of .100. It makes sense that it would work this way - if a switch is a DHCP server it will not propagate the requests.?)
Any questions please ask.