Weird Switch Issue
Posted on 2011-04-25
I've got a weird switch issue I'm hoping you can help me solve.
I've got a Cisco Small Business SG-200 48 port gig switch. I want to reserve the first 16 ports to an engineering VLAN and the rest to general office use. I set ports 1-16 to VLAN 1 and 16-50 on VLAN3. Port 1 connects to an interface on our FW that dishes out 192.168.1.0 addresses and port 49 connects to the 192.168.3.0 FW interface. Port 50 has an uplink to a Netgear switch to the 192.168.3.x network.
When I plug in a laptop into ports 2-16 everything works fine. I get 192.168.1.x IP address and the internet works fine.
When I connect to the remaining ports on the Cisco, some of the ports work and some don't. It's completely random. In all cases I get a 192.168.3.x IP address just fine but I with some ports I can't ping the default GW and obviously can't get out. There are about 10 ports that don't work. I checked the port configuration and they're set exactly the same. I tried multiple laptops even setting a manual speed and duplex with no luck. I'm baffled!
I had to offload those bad ports to the Netgear until this issue gets resolved.
ANY help is appreciated!