legallkp.blogg.se - Redundancy in network topology

Spanning Tree protocols, such as RSTP, were developed to detect these switch loop conditions and then intelligently reconfigure the network to provide the break that eliminates the switch loop scenario. One resolution to this problem is to simply break the loop somewhere in the ring. This condition can block all other network traffic and will eventually result in a network meltdown. Since the Layer 2 header does not support a Time-to-Live (TTL) value, if a frame is sent into a looped topology, it can loop forever severely consuming all available bandwidth on the ring making the network unusable. If a destination for the message cannot be found, the switches will repeatedly rebroadcast the messages, flooding the network. These storms occur when broadcasts and multicasts are forwarded by the switches out of every port. The disadvantage of forming a ring network using switches is that this topology can introduce a “switch loop” condition that creates broadcast storms. The problem with switch loop scenarios and Spanning Tree protocols The failure of a single point can lead to an entire production facility being disabled. Therefore, the administrator must have a recovery plan in place. However, if one node or port goes down, the entire network is affected.

It provides a more cost-effective cabling infrastructure than using an aggregation switch at a central location.

Each switch has a redundant connection (link) into the network.

Ease of set-up and high-speed performance make Ring topology networks incredibly popular in factories, on plant floors, and other Industrial Ethernet environments. In a ring network, each Ethernet switch is connected to a minimum of two other switches to form a ring. Perle Systems Technical Notes Ring Protocol MRP (IEC 62439-2) Media Redundancy Protocol (MRP) is a standards-based protocol used in Ring topologies to avoid single points of failure by providing a recovery time of 10ms or less.