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Setting up ML cards in 454 so that Spanning Tree one side blocks

Currently we have two ML 1000 cards in our Main ONS 454. We have spanning tree set up on a 3560G switch that brings the IP portion of the SONET to all the other 310's in our network. Now when I do a sh spanning tree on the both ports on the switch that go up to ports 1 on the ML 1000 cards it shows me that both are in forwarding mode. How do I set this up so that one of the is blocking?

Thanks

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