3com 4500 with 3com 3870 stack and trunk

[bobvdwoude]

Hello,

A customer of ours has 4x 3com 4500 switches and one 3870 switch.
Now all the 4500 switches are connected with 2 cables on port 27 and 28 to a ethernet port in the 3870 switch, the 4500 switches are not in a Stack configured.

Also the switches are not configured with LACP ports and STP is running, if i take a look at the port 28 on all the switches its enabled but when i view the STP configuration its sais blocked on port 28 and forwarding on port 27.
It seems to me that this configuration is not performing well and they are not using the trunks.

I would like to setup the 4x 4500 switches in stack and use port 27 and 28 to stack.
All the workstations are in the 4500 stack, the servers are in the 3870 switch.


Is it a good choice to stack the 4 switches?
Do i need to trunk them together or just create trunks to the 3870 switch?

Thank you for your answer.

 

[bobvdwoude]

Sorry ive got it wrong, they used port 27 & port28 to trunk because they are gigabit ports, but they forgot to configure the ports with lacp.
So i will configure lacp for these ports.

Now my question is can i stack the switches on the ethernet ports?

 

[IRudebwoy]

My experience with the 50 port version says no. I could only use two of the four GB ports as either stacking ports or a link to the core.

I opted for the aggregate link to the core.

Have Fun!