D-Link DGS-3308FG Product Manual - Page 230
VLAN 2. Thus, there are three redundant paths between switches A and B and two blocked ports per
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8-port Gigabit Ethernet Switch User's Guide 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 switches A and B and two blocked ports per VLAN. This increases the chance of a data loop. 220
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8-port Gigabit Ethernet Switch User’s Guide
220
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 switches A and B and two blocked ports per VLAN. This
increases the chance of a data loop.