#Redundancy in network topology mac#

It is recommended to apply those settings before configuring ring membership. Once a port is part of a ring, the media-type, speed, and duplex settings of the port cannot be changed.

It is recommended to disable PTP manually before enabling the ring ports. By default, all modes of Spanning Tree Protocol (STP) will be disabled on the ring ports.STP and PTP are not supported on the HSR ring.– Link Aggregation Control Protocol (LACP) The following protocols and features are mutually exclusive with HSR on the same port:.Ring 1 and Ring 2 can both be configured in HSR-SAN mode.HSR ring ports can only be configured in Layer 2 mode.Nodes are all the DANH and VDAN devices that can be connected to the ring at same time. The maximum number of nodes in the node table is 512.Using these four ports, you can create one of the following configurations: A maximum of four ports support HSR/PRP.HSR is supported on the Cisco IE 4000, Cisco IE 4010, and Cisco IE 5000.This rule prevents a frame from spinning in the ring in an infinite loop. – The node had already sent the same frame in the same direction.

#Redundancy in network topology mac#

– The frame is a unicast frame with a destination MAC address of a node upstream of the receiving node. – The received frame returns to the originating node in the ring. A node will not forward frames received on one port to the other under the following conditions:

Each node in the HSR ring forwards frames received from one port to the other port of the HSR pair.

The destination DANH removes the HSR tag of the first frame before passing it to its upper layers and discards any duplicate.

A destination DANH receives two identical frames from each port within a certain interval.

A source DANH sends a frame passed from its upper layers (“C” frame), prefixes it with an HSR tag to identify frame duplicates, and sends the frame over each port (“A” frame and “B” frame).

In this mode, packets are handled as follows: In HSR-SAN mode, the RedBox inserts the HSR tag on behalf of the host and forwards the ring traffic, except for frames sent by the node itself, duplicate frames, and frames for which the node is the unique destination. This document guides the reader through the high-level technology and architecture. This High-Availability Seamless Redundancy in the Factory Network Cisco Validated Design (CVD) provides a tested and validated architecture to deploy HSR in ring topologies in the factory Cell/Area zone, which is the area where the IACS and end devices (Levels 0-2) connect to the network.

Zero convergence time when a node, link, or switch fails.

In contrast, other ring redundancy protocols block one path and use only the primary one, dropping some packets during convergence. The receiving node accepts the first packet and discards the second. HSR supports single fault in the ring with no downtime by sending each packet in both directions in the ring. The High-availability Seamless Redundancy (HSR) protocol that is defined in IEC 62439-3 is designed to achieve zero recovery time in ring topologies, making it suitable for automation networks where the downtime of Industrial Automation and Control System (IACS) applications should be kept to a minimum. Highly-available equipment requires a resilient network that minimizes downtime for the mission critical production cycle. In today's Internet of Things (IoT) world, manufacturing industries are adopting the vision of connecting devices and implementing a converged plant floor to reduce operational costs and increase productivity.