We bought some new 3650's 12/48 port switches. Basically 48 ports with 12 mgig ports. I work in a k12 environment and in a rear occasion we use unmanaged switch in a office or classroom to provide connectivity for a small group of devices without needing to run more cable or another managed switch.
Over the last month I noticed two locations where we have a unmanaged switch connecting back to a 3650 and it not passing DHCP when "multiple" clients are on the unmanaged switch. We are using a Cisco 3650 switch with access port vlan 4 and tring to connect it to unmanaged netgear switch with clients all on vlan 4. This setup worked for us with our previous 2960 switches configuration. However, its not working well with out 3650 switches. I might get 2 out of the 4 devices connecting to the unmanaged switch but that's about it. I tried different unmanaged switches with no luck.
At one of the locations I decided to put a small 2950 switch in one of the classrooms instead of using a unmanaged switch. I changed the connection from a access port with vlan4 to trunk port on the 3650 and configured a 2950 with a trunk port. All of the 8 ports on the classroom 2950 cisco switch where programmed to vlan 4 and it works. I'm using the same copper wiring with a 1gbps ethernet sfp. Bottom line.. Connectivity from the cisco switch to the unmanage switch works fine with 2 or less devices. Over 2 devices and no dhcp. Any ideas on what may prevent this? CDP? Bad IOS? We are on version 16.6. Thanks!
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