5-32 D60 Line Distance Protection System GE Multilin5.2 PRODUCT SETUP 5 SETTINGS5traffic is prevented from flowing on that path, connectivity is still provided through the other network to ensure continuouscommunication. Take care when designing the two LANs, so that no single point of failure (such as a common power sup-ply) is encountered, as such scenarios can bring down both LANs simultaneously.Figure 5–8: EXAMPLE OF PARALLEL REDUNDANT NETWORKPRP uses specialized nodes called doubly attached nodes (DANPs) for handling the duplicated frames. DANPs deviceshave an additional module, called Link Redundancy Entity (LRE). LRE is responsible for duplicating frames and adding thespecific PRP trailer when sending the frames out on the LAN, as well as making decisions on received frames as to whichone is sent up the OSI stack to the application layer and which one is discarded. LRE is responsible for making PRP trans-parent to the higher layers of the stack. There is a second type of specialized device used in PRP networks, called RedBox,with the role of connecting Single Attached Nodes (SANs) to a redundant network.UR relays implement only the DANP functionality. The RedBox functionality is not implemented.The original standard IEC 62439-3 (2010) was amended to align PRP with the High-availability Seamless Redundancy(HSR) protocol. To achieve this, the original PRP was modified at the cost of losing compatibility with the PRP 2010 ver-sion. The revised standard IEC 62439-3 (2012) is commonly referred to as PRP-1, while the original standard is PRP-0.The UR relays support only PRP-1.The relay implements PRP on two of its Ethernet ports, specifically Port 2 and 3 of the CPU module. Use the previous sec-tion (network port configuration) to configure PRP.PRP is purchased as a separate option. If purchased (valid order code), PRP can be enabled in configuration through asetting available on the network configuration menu, REDUNDANCY, which already has the capability of enabling failoverredundancy. The options on this setting must be changed to accommodate two types of redundancy: failover and PRP.When REDUNDANCY is set to either failover or PRP, the ports dedicated for PRP (Port 2 and 3) operate in redundantmode. In this mode, Port 3 uses the Mac, IP address, and mask of Port 2.g) ROUTINGPATH: SETTINGS PRODUCT SETUP COMMUNICATIONS ROUTING 1(6)A default route and a maximum number of six static routes can be configured.The default route is used as the last choice when no other route towards a given destination is found. IPV4 ROUTING TABLEIPV4 DEFAULT ROUTEMESSAGE IPV4 STATICNETWORK ROUTE 1MESSAGE IPV4 STATICNETWORK ROUTE 6 IPV4 DEFAULT ROUTEGATEWAY ADDRESS127.0.0.1Range: Standard IPV4 unicast address format
