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I am having a few problems with my new 3com 4500G switch at work.
I have created 3 VLANs on the new 4500G switch, inter VLAN routing works fine on the switch itself. So a host on VLAN 3 can ping a host on VLAN 4 with no problems.
However the problem is when i try to ping a host on the existing network or the default gateway, the ping just times out. Here is my subnet information.
VLAN 2 on the 4500G = 10.69.76.1 255.255.252.0
VLAN 3 on the 4500G = 10.69.80.1 255.255.252.0
VLAN 4 on the 4500G - 10.69.84.1 255.255.252.0
The default gateway = 10.69.72.1 255.255.252.0
The default gateway is a cisco 3750 switch which is connected to a dumb fibre device. We are part of a large enterprise network.
Port 2 VLAN 2 on the 4500G is connected to the cisco 3750.
So communication works fine within the 4500G but i cannot communicate from outside the 4500G!
Just to add i can ping the default gateway (10.69.72.1) from the console connection of the 4500G!
Any suggestions please??
the 10.69.72.1 network is in its own vlan on the 4500g. The uplink has got the IP adress of 10.69.75.90/22 which is an IP address from the 10.69.72.1 network.
I have not entered a default gateway in the 4500g, what should this be?
any suggestions please?
Those switches are L2/L3 right? I'm only familiar with Cisco 2x00 switches and routers, but I would guess that the 4500G is doing what a router-on-a-stick config would normally do with less powerful kit - that's where I thought you'd need the ip commands.
The troubleshooting steps here might help; click here
Not sure if you have this working now but I think I might be able to help.
Here is what I understand so far:
Vlan 2, 3 and 4 are working fine on the 4500G as each vlan on this switch has an interface with a ip on it for the inter vlan routing to work. (Correct?)
The connection to the Cisco switch is what I don't understand? You said - The uplink has got the IP adress of 10.69.75.90/22. is this the ip address on the cisco switch? If so it sounds like you will need to put a route on your 4500G which says 10.69.72.0/22 go via 10.69.75.90 (not sure how this is done on a 3com switch as I am a cisco man myself).
To connect these switches together I would normally use a trunk port or I would connect them on a routed link using a different network just for connecting network devices.
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