CHAPTER 5: SETTINGS PRODUCT SETUPN60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL 5-335Figure 5-8: Example of parallel redundant networkPRP uses specialized nodes called doubly attached nodes (DANPs) for handling the duplicated frames. DANP devices havean additional module, called a 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 PRPtransparent to the higher layers of the stack.In addition, there is a second type of specialized device used in PRP networks, called RedBox, with the role of connectingSingle Attached Nodes (SANs) to a redundant network.UR relays implement 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 version. Therevised standard IEC 62439-3 (2012) is commonly referred to as PRP-1, while the original standard is PRP-0. The UR relayssupport PRP-1.The relay implements PRP on two of its Ethernet ports, specifically Ports 2 and 3 of the CPU module. Use the previoussection (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 (Ports 2 and 3) operate in redundant mode.In this mode, Port 3 uses the MAC, IP address, and mask of Port 2.5.3.4.7 RoutingSETTINGS PRODUCT SETUP COMMUNICATIONS IPv4 ROUTE TABLE 1(6)A default route and up to 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 ROUTE TABLE DEFAULT IPv4 ROUTE IPv4 NETWORKROUTE 1 IPv4 NETWORKROUTE 6 DEFAULT IPv4 ROUTE GATEWAY ADDRESS:127.0.0.1Range: standard IPV4 unicast address format IPv4 NETWORK ROUTE 1 RT1 DESTINATION:127.0.0.1Range: standard IPV4 address format
