Configuration > Trunking; Configuration > Igmp Snooping - D-Link 24-Port 10/100Mbps PoE Web Smart Switch with 4-Port 10/100/1000Base-T and 2-Port Combo SFP DES-1228P User Manual

Configuration > Trunking
The Trunking function enables the cascading of two or more ports for
a combined larger bandwidth. Up to six Trunk groups may be created,
each supporting up to 8 ports. Add a Trunking Name and select the
ports to be trunked together, and click Apply to activate the selected
Trunking groups.
NOTE: Each combined trunk port must be connected to devices
within the same VLAN group.
Configuration > IGMP Snooping
With Internet Group Management Protocol (IGMP) snooping, the
Web-Smart Switch can make intelligent multicast forwarding
Figure 32 – Configuration > Trunking
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