ERS 3500 fiber ring

[gknight1]

We have a customer that currently has 4 buildings on their property with fiber going to them all jumping from building to building, each one connected to a 3524GT-PWR via GBIC. The customer is adding another building looking to complete a fiber ring around the property. Right now I just have all the VLANs tagged on the ports that have the fiber plugged in. How do I program the 2 ports that will be connecting the fiber ring to prevent a loop? Do I need to change how the ports are currently programmed on the uplink ports now?

Not sure exactly what version the switches are on, think most of them are 5.2. I can upgrade if needed.

Any help is greatly appreciated.

 

[atascoman]

If you have the same VLANs all the way around you will create a loop for sure. What I have done in this scenario, is setup unique routed WAN VLANs between the sites. I am not 100% sure which Layer 3 protocols that specific box supports, but this is how I have done it and it works just fine.

 

[gknight1]

they have the same vlans on all switches. based on response on other forums, it looks like RSTP is the way to go.