I have 3 Catalyst switches connected to an old layer 3 3Com switch. and the internet line coming through the Sonicwall into the 3Com.  

The default gateway of the individual hosts is set to the 3Com.

I am just trying to swap out the 3Com with the Powerconnect.   I have 3 VLANS (1,50,60), when I turned on the IP routing and swapped out the 3Com I can get all interVLAN routing and everything internal, but I can't get the internet traffic to dump out to the SonicWall.

Yes, that is what we changed it over to, the PowerConnect is currently running as a non-routing switch off to the side of the 3Com, since we needed to get the network back up for the work day.  But that diagram is what we are trying to accomplish.

I inherited the network and the devices, the PowerConnect was partially setup (hence the unused VLAN 99) and I reconfigured the setup to what I though was working.

At the moment the Sonicwall is actually plugged into one of the Catalysts (I don't know why), though I will be moving it to the PowerConnect.

The PowerConnect and Catalysts are working fine at Layer2, I just need to promote the PowerConnect up to Layer3 and dump the flaky 3Com.  

!Current Configuration:

!System Description "Powerconnect 6248P, 3.2.0.7, VxWorks 6.5"

!System Software Version 3.2.0.7

!Cut-through mode is configured as disabled

!

configure

vlan database

vlan 55,60,99

vlan routing 60 1

vlan routing 55 2

exit

snmp-server location "1661 Glenlake"

hostname "1661_6248P"

clock timezone -6 minutes 0 zone "CST"

stack

member 1 5

member 2 5

exit

ip address 192.168.50.6 255.255.255.0

ip default-gateway 192.168.50.3

no ip domain-lookup

ip routing

ip helper-address 192.168.50.150 dhcp

interface vlan 55

name "Printers"

routing

ip address 192.168.55.1 255.255.255.0

ip helper-address 192.168.50.150 dhcp

exit

interface vlan 60

name "ShoreTel"

routing

ip address 192.168.60.1 255.255.255.0

exit

interface vlan 99

name "Management"

exit

username "admin" password 1eca28ad410e9b50473e229b76ec9df7 level 15 encrypted

!

and all the ports are setup identical

interface ethernet 1/g2

spanning-tree portfast

switchport mode general

switchport general allowed vlan add 55,60 tagged

voice vlan 60

exit

!

VLAN 55 is for the Printers and 60 is for the VoiceVLAN, 99 isn't implemented and will go away.

I setup the VLAN 10 (192.168.10.1) and configured the port i'll be moving it to as below:

interface ethernet 1/g44

spanning-tree portfast

switchport access vlan 10

exit

So, all i have to do know (outside of Sonicwall configuration) is to add the last resort route?  'ip route 0.0.0.0 0.0.0.0 192.168.10.2' and it should be good to go?

If so we're going to try it tomorrow morning before the place gets up and running.

Thanks

Alright, we're going to give it a try tomorrow morning.

I wouldn't have thought to try the separate VLAN for the outbound connection, so thank you very much for your help.

If instead of Catalast Switches, these were pc_clients in a vlan, what type of mode should the port be set to?