{"id":1514,"date":"2017-09-18T09:56:02","date_gmt":"2017-09-18T08:56:02","guid":{"rendered":"https:\/\/netcloudengineering.com\/?p=1514"},"modified":"2019-09-19T08:41:07","modified_gmt":"2019-09-19T07:41:07","slug":"protocolos-redundantes-prp-hsr","status":"publish","type":"post","link":"https:\/\/netcloudengineering.com\/en\/protocolos-redundantes-prp-hsr\/","title":{"rendered":"PRP and HSR Redundant Industrial Communication Protocols"},"content":{"rendered":"<p class=\"p1\">When establishing communication between industrial servers and networks, two types of protocols can be used, which are the ones we'll be discussing today: <b>PRP and HSR redundant industrial communication protocols<\/b>.<\/p>\n<h2 class=\"p4\">\u00bfC\u00f3mo son PRP y HSR?<\/h2>\n<p class=\"p3\"><span class=\"s1\">We'll explain how they work and what their features are <strong>the two most important redundant industrial communication protocols<\/strong> en la <a href=\"https:\/\/netcloudengineering.com\/en\/consultoria-redes-telecomunicaciones\/\">Industrial communication<\/a>.<\/span><\/p>\n<h2 class=\"p5\">Protocolo PRP<\/h2>\n<p class=\"p3\"><span class=\"s1\"><strong>PRP<\/strong> It ensures high availability and reduces the time it takes for the network to recover, thereby also reducing transmission time to zero.<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">It is based on the use of two networks, LAN A and LAN B, which are independent at all levels and receive the same message at the same time.<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">A frame with the same MAC and IP addresses will be sent over both interfaces but on different ports.<\/span><\/p>\n<p class=\"p3\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1517 aligncenter\" src=\"https:\/\/netcloudengineering.com\/wp-content\/uploads\/2017\/09\/PRP-HSR-RSTP-protocolos.jpg\" alt=\"Protocolos de comunicaci\u00f3n industrial\" width=\"486\" height=\"619\" srcset=\"https:\/\/netcloudengineering.com\/wp-content\/uploads\/2017\/09\/PRP-HSR-RSTP-protocolos.jpg 486w, https:\/\/netcloudengineering.com\/wp-content\/uploads\/2017\/09\/PRP-HSR-RSTP-protocolos-236x300.jpg 236w\" sizes=\"auto, (max-width: 486px) 100vw, 486px\" \/><\/p>\n<p class=\"p3\"><span class=\"s1\">Whether or not this protocol is used, the configuration of the <a href=\"https:\/\/netcloudengineering.com\/en\/redes-industriales-ethernet\/\">industrial networks<\/a> and the routers do not need to be changed. Latency will remain similar in both, though not exactly the same, given that there will be a time difference in the second frame.<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">This protocol is encapsulated in an IP network frame, allowing for transparent use of the protocol, so that both PRP devices and non-PRP devices can communicate over it.<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">Thus, we may encounter two types of devices for each network: one with built-in redundancy (DANP) and another without it (SAN).<\/span><\/p>\n<h3 class=\"p6\"><i>DANP Devices<\/i><\/h3>\n<p class=\"p3\"><span class=\"s1\">These devices from the <a href=\"http:\/\/www.redeweb.com\/articulos\/memoria\/iec-62439-3-hsr-y-prp-protocolos-para-redes-ethernet-redundantes\/\" target=\"_blank\" rel=\"noopener noreferrer\"><em>protocolo PRP<\/em><\/a> They implement an additional operation specific to this layer, which is carried out through an LRE that is responsible for duplicating frames and managing redundant frames while remaining transparent to the other OSI layers at Layer 2. The LRE:<\/span><\/p>\n<ul>\n<li class=\"li3\"><span class=\"s1\">Receives a Layer 3 link-trace. <\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">Respond by creating two new frames and adding RCT bytes after the IP header.<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">Send the frames over the port corresponding to the two independent networks.<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">At the receiver, the RCT is removed, and the frame is also forwarded to the upper layers.<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">Frame discarding is typically performed to remove duplicate frames from the LRE.<\/span><\/li>\n<\/ul>\n<h2 class=\"p5\">Protocolo HSR<\/h2>\n<p class=\"p3\"><span class=\"s1\"><strong>HSR is a redundant protocol, like PRP<\/strong>. This ensures high availability while reducing both network recovery time and transmission time to zero.<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">In this case, it is based on device redundancy, converting a Layer 3 frame into two identical HSRs that are sent through the device's two ports to a ring-topology network but in opposite directions. Devices connected to this network are called DANHs.<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">Although it also operates on Layer 2, the <a href=\"https:\/\/en.wikipedia.org\/wiki\/High-availability_Seamless_Redundancy\" target=\"_blank\" rel=\"noopener noreferrer\"><em>protocolo HSR<\/em><\/a> It will modify the Ethernet frame headers by adding the new fields; this is why there must be only DANH nodes.<\/span><\/p>\n<p class=\"p3\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1516 aligncenter\" src=\"https:\/\/netcloudengineering.com\/wp-content\/uploads\/2017\/09\/HSR-protocolo-redundante.jpg\" alt=\"Protocolo de comunicaci\u00f3n industrial HSR\" width=\"840\" height=\"720\" srcset=\"https:\/\/netcloudengineering.com\/wp-content\/uploads\/2017\/09\/HSR-protocolo-redundante.jpg 840w, https:\/\/netcloudengineering.com\/wp-content\/uploads\/2017\/09\/HSR-protocolo-redundante-300x257.jpg 300w, https:\/\/netcloudengineering.com\/wp-content\/uploads\/2017\/09\/HSR-protocolo-redundante-768x658.jpg 768w\" sizes=\"auto, (max-width: 840px) 100vw, 840px\" \/><\/p>\n<p class=\"p3\"><strong><span class=\"s1\">The most notable differences compared to the PRP protocol are:<\/span><\/strong><\/p>\n<ul>\n<li class=\"li3\"><span class=\"s1\">There is only one LAN with a ring topology.<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">Any device will understand the protocol; they are DANH nodes.<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">The switches, which are SAN switches, are not inserted into the ring.<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">The devices send and receive frames, with an additional feature that acts as a bridge.<\/span><\/li>\n<\/ul>\n<p class=\"p3\"><strong><span class=\"s1\">Note that SAN devices can be converted to VAND, supporting both HSR and PRP protocols, as follows:<\/span><\/strong><\/p>\n<ul>\n<li class=\"li3\"><span class=\"s1\">Regardless of the device they are mirrored to.<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">Reusable, with the ability to switch devices, protocols, or networks as needed.<\/span><\/li>\n<\/ul>\n<p class=\"p3\"><strong><span class=\"s1\">In addition, depending on its configuration:<\/span><\/strong><\/p>\n<ul>\n<li class=\"li3\"><span class=\"s1\">They will allow us to choose the output protocol.<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">At the same time, they duplicate the code for different devices.<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">They can be reconfigured remotely, allowing redundant devices to be removed without downtime or manual rewiring.<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">Security is also configurable.<\/span><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>A la hora de establecer comunicaci\u00f3n entre servidores\/redes industriales se pueden usar dos tipos de protocolos, que son de los que hablaremos hoy: protocolos redundantes de comunicaci\u00f3n industrial PRP [&hellip;]<\/p>\n","protected":false},"author":60,"featured_media":1518,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18,43],"tags":[67,66,39],"class_list":["post-1514","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-auditoria-redes-telecomunicaciones","category-consultoria-de-redes","tag-protocolo-hsr","tag-protocolo-prp","tag-redes-industriales"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Protocolos redundantes de comunicaci\u00f3n industrial PRP y HSR<\/title>\n<meta name=\"description\" content=\"Te contamos c\u00f3mo funcionan y cu\u00e1les son las caracter\u00edsticas de los dos protocolos redundantes de comunicaci\u00f3n industrial PRP y HSR.\" \/>\n<meta name=\"robots\" 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