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Hi Iamdexter Thanks for the reply, I see what you are saying but the original problem was that even though 21 and 22 were in Vlan1 only and 23 and 24 were in Vlan2 only as soon as both uplink ports 21 (192) and 24(172) were connected the switch got confused about where to send the data. It...

Thank you for your help. I still can't figure it out but have decided on a setup that only requires 1 uplink, it means i will be using more switches but it will do for now until i have a better understanding of the switches. Thanks again for your help.

Need DHCP to work... not sure quite were to identify the DHCP server or UDP helper, but I will look into it! I'll try anything right now!!

Yes tried that and thats where it all goes wrong. Vlan 1 - ports 1-12 and 21 all untagged Vlan 2 - ports 13-20 and 24 all untagged I thought this should work but even though they are in different Vlans it still seems to get confused and I am unable to obtain an IP from the 172 network...

Thanks. I can get it to work via one uplink ok but what I wanted to do was use two uplinks... 192 via 1 uplink (port 21) and 172 via another uplink (port 24). I am begining think this is not possible!

I think I have tried this but still no joy! Here is what i have done: Switch 1 (Source of networks) Vlan 1 (192) - Ports 1-12 Untagged; Ports 21-22 tagged Vlan 2 (172) - Ports 12-20 Untagged; Ports 23-24 Untagged Vlan interface: Vlan 1 192 IP address (primary) Vlan 2 172 IP address...

Hi this is driving me mad! I am trying to use 2 3870 switches to send 2 networks accross fibre. I want to use 2 uplinks 1 for each network. I have 2 networks 192.. and 172.. First I joined ports 1-12 and 24 (24 tagged) to vlan 1 (192 network) and ports 13-20 and 24 (24 tagged again) to vlan 2...