Media Redundancy Protocol

It allows rings of Ethernet switches to overcome any single failure with recovery time much faster than achievable with Spanning Tree Protocol.

In case of failure, the network works in the Ring-Open status (Figure 2).

MRP information is sent in the form of an Ethernet frame, with the EtherType field set to 0x88E3.

The frames are built by Type–length–value (TLV) structures, allowing organizationally specific information.

The International Electrotechnical Commission standard for MRP was published in 2010 as IEC 62439-2[7] and amended in 2012.

Figure 1: MRP ring in Ring-Closed status
Figure 2: MRP ring in Ring-Open status