1. First, we download and install Cisco simulator software on this site, open the Cisco simulator and open the tcp main interface, click Options in the interface, and then click tcp in the drop-down options to enter the interface.

2. Then, after we enter the tcp interface, we check the alwaysshowportlabels option in the Interface tab of the interface. After the inspection, we can close the tcp setting interface.

3. Then return to the topology interface, and users can see the linked tcp ports. The above is the solution for Cisco Simulator to open tcp port.