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D-Link DES-3326S User Manual

Page 337

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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

Understanding and Troubleshooting the Spanning Tree Protocol

337

This is a common network design. The switches C and D have
redundant links to the backbone switches A and B using
trunks. Trunks, by default, carry all the VLAN traffic from
VLAN 1 and VLAN 2. So switch C is not only receiving traffic
for VLAN 1, but it is also receiving unnecessary broadcast and
multicast traffic for VLAN 2. It is also blocking one port for
VLAN 2. Thus, there are three redundant paths between