I recently joined a small company that had all user, server and voice traffic in a single VLAN. The subnetting went something like this:
VLAN 1 - 172.16.4.x/22
Since starting, I began a migration to get all user, server and voice traffic segmented to their own VLANs to minimize broadcasts and traffic to devices that don't need it. The switches are 3750's (5 of them in a switch stack configuration). The subnetting is as follows:
User VLAN 128 - 172.16.128.x/23
Voice VLAN 130 - 172.16.130.x/24
Server VLAN 131 - 172.16.131.x/24
I turned on IP routing on the switch stack and made VLAN interfaces for each seperate VLAN along with gateway IP's, DHCP, etc, etc. I am about 1/4 of the way along in the migration. A few things that I am noticing is that:
a) When I do a packet capture, devices that are now on the 172.16.128.x subnet are still seeing broadcast traffic on the 172.16.x.x network outside of the 172.16.128.x subnet.
b) The Layer 3 VLAN interfaces on the 3750's are seeing very minimal traffic.
Any ideas why this is happening?