Port replication is one of the most effective methods to avoid downtime in the data center due to unplugging the wrong cable. The reason it is so effective is because it is a simple and logical approach.
Port replication “mirrors” the ports of active fiber optic hardware in a passive component (fiber patch panel), creating a direct, one-to-one relationship between the active hardware ports and the passive structured cabling environment.
This allows switches to be cabled once and replicated in a Main Distribution Area (MDA), simplifying the cabling process with all numbers on the hardware directly corresponding to the numbers on the patch panel.
Any changes can then be made at the MDA, as recommended in the TIA-942 Data Center Standard. Making changes in the passive MDA environment reduces cable management issues, decreases opportunities for patching errors and limits wear and tear on active ports.
This video shows what port replication is and how it is used.
This video covers cabling and port replication for a Brocade 48000.
This video covers cabling and port replication for a Cisco Nexus chassis.