D-Link DES-3326 User Manual - page 394
Manual is about: 24-Port Fast Ethernet Plus 2-Port Gigabit Module Layer 3 Switch
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DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
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Understanding and Troubleshooting the Spanning Tree Protocol
Using layer 3 switches and IP routing eliminates the need for STP
port blocking because the packets are routed by destination
addresses. The link redundancy remains, and relying on the
routing protocols gives a faster convergence than with STP.
The drawback is that the introduction of layer 3 switching usually
requires a new addressing scheme.