I have a rather unusual puzzle going on with my N3048 switch stack that I'm unable to piece together. I'm trying to consolidate some equipment from an old Netgear Prosafe unmanaged switch onto my PowerConnect switches, but when I transfer them over, this change in L2 topology creates an impact on traffic delivery based on L3 data.
My network is connected as shown in the diagram below. The intent is to move all the hosts connected to the netgear to the powerconnect, then reconnect the router to the powerconnect and remove the netgear. Before moving from the netgear, hosts are able to be reached by other hosts on the local network as well as by hosts in network 1. After moving to the powerconnect, only hosts on the local network can reach the device.
I ran a wireshark capture on the host and the router. No changes were observed in the traffic coming from the router, but after moving from the netgear to the powerconnect, no frames containing packets from network 1 were delivered to the host. I also ran a ping from the router interface directly and those arrived at the host just fine, despite having the exact same ethernet headers as the frames containing the network 1 packets that never arrived!
Since the traffic is entering the powerconnect, but never being forwarded, I can only assume this is an issue with the powerconnect switch. Since the powerconnect is not doing routing on this vlan, that seems extremely strange. No ACLs of any kind are defined on the powerconnect switch. Can anyone offer any insight into this bizarre behavior?
