This is a two question topic. I am in an office building and I want to provide ISP services to people throughout the building. I have 5 2900XL switches with fiber gigabit ports for uplinking to each other. I will put one switch in each floor for clients to plug into, and run fiber from floor to floor.
Using the equiptment I have (i.e. -- not special SONET equiptment or anything), how can I create a redudant ring so that if the fiber is broken traffic will flow in the other direction? I know SONET will do this, but I don't want to buy special equiptment for that.
Also, please remember this will need to be at layer-2 since these are only layer-2 switches, so using dynamic routing to handle the redudancy is not an option.
Finally, each client will be put in their own VLAN. How can I rate limit the outbound traffic? For example, I may want to sell a 6Mbps service and charge more for it than a 3Mbps service.
Is there any way I can use what I have to do what I need? If not, what additional equiptment do I need to buy?
You can certainly daisy chain them into a ring type topology, and Spanning Tree Protocol will block one of the redundant links to prevent a loop.
A better, (but more costly design) would be to have two additional switches and dual home all of the 2900xl switches to the "core switches." That will give you redundancy as well as keeping traffic flow such that the 2900 switches aren't used as "transit" switches for devices communicating between non-contiguous switches. However, for 5 switches, this may be overkill :-)
As for rate limiting, the 2900XL series switches do not provide rate-limiting or policing features. They are fairly dumb Layer 2 devices and will not give you the option to limit the bandwidth on any port. The lowest-end switch that we currently sell that can do rate-limiting is the 2960.
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