Metro topology and STP protocol

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Jun 6th, 2007
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Hi, I have a backbone made by SDH technology and there are a lot of point of metro aggregation access places connected to. Connected to that access (up to 40 KM) place there are sinlge centers that r teach the final customer. All the structure is made by fiber optic. The idea is to use layer 3 equipment to connect the access places. Wthat about the topology; shoul be better use a ring to connet the access places? What about the spanning three protocol; how can I eliminate it?


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swaroop.potdar Wed, 06/06/2007 - 01:43
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Since you have multiple acces agg points, a ring on the phy layer conecting these points would be ideal. And you may want to run RSTP on the routing/switching devices to on layer 2 to break the loop.

If you dont want the STP to be run, then you can have a dual self healing ring in the core connecting the agg locations and then provision point to point circuits with the central location.



francynet Wed, 06/06/2007 - 02:09
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Thanks. Probably I have not undestood very well; if I use layer 3 in the access node it is completly eliminated the STP? I tought that STP is only with layer 2 only. Otherways, why not?


swaroop.potdar Wed, 06/06/2007 - 02:15
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Ok, If you plan to use pure routing with layer 3 devices you definately wont need STP.

And you would be good to go, if you can take care of the healover on the physical layer.

I assumed you original post was to do with deploying a METRO ring.Anyways its ok.




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