A combo port, also known as an optoelectronic multiplexing interface, is a photoelectric composite port with two kinds of Ethernet interfaces (RJ45 port and SFP port) on an Ethernet switch. First, we need to identify the ports available on each switch and determine how they will be connected. Finally, we will also look at the types of traffic that are allowed to be sent and. When a single switch cannot meet the network's growing demands (such as an insufficient number of ports or certain functional limitations), we typically combine multiple Ethernet switches. But how can we connect network switches together? This article will explore three common connection methods:. These two separate fiber links connect to our switch ports, say A1 and B1. There are also two router objects on these ports, say Primary and Secondary, respectively in order to assign IP addresses to these ports for multicast subscription.