What this means is that if one link in the traffic flow or a switch goes down, traffic can continue to flow using an alternate path. This type of mesh interlinked switches uses Spanning Tree Protocol (STEP) to detect and prevent loops. A loop occurs when there are multiple active paths to the same switch and this causes the system to crash. Some advantages of Hap’s RIFF Resiliency are higher efficiency with IRE’s loop-free, non-blocking architecture. This is designed to keep all links active, enabling highly efficient, high bandwidth connectivity throughout the switching plane.
Scalable performance is achieved with RIFF and Link Aggregation Control Protocol (LACK). When used together, they can boost performance by bundling several parallel links between switches and servers, allowing scalable “on-demand” performance and capacity to support critical business applications. Hap’s RIFF Resiliency offers faster failover in the event a network failure occurs; RIFF can deliver rapid recovery and network re-convergence in fewer than 50 licensed?much faster than the several seconds required for STEP.
The disadvantages associated with Hap’s RIFF Resiliency are said to be poor performance because it blocks all parallel paths except the one it has selected as active. Technicians have complained that even when the network is operating normally STEP actually reduces the effective bandwidth. Some people claim that the choice of which protocol to use is difficult and that there is a slow network convergence. One problem is that the re-convergence time for STEP can be several seconds. In contrast, Cisco Layer 2 Resiliency advantages are claimed to offer rapid failover without service disruption.
The layer 2 is designed to streamline change management and service turn-up without WAN disruption with fewer errors. It offers a high availability through real-time recovery and resiliency at the network, device and design levels. Cisco Layer 2 Resiliency offers increased system redundancy at the platform level, network security through access layer defense, identity-based trust, pervasive security and management as well as providing vice posture assessments. Operational efficiency is achieved through automated configuration, proactive diagnostics and simplified troubleshooting.
This is designed to provide predictable application performance to support converged applications as well as support IP multicast for new applications. As with Hap’s RIFF Resiliency, there are several disadvantages associated with Cisco Layer 2 Resiliency. The router supports REP only when the router is running the metro IP access or the metro access image. You have to configure each segment rot or an incorrect configuration will cause forwarding loops in networks. REP can only manage one failed port within a segment.
Multiple port failures within the REP segment cause high loss of network connectivity. Due to its simplistic manageability and scalability I would recommend Hap’s RIFF Resiliency over Cisco Layer 2 Resiliency. Due to the limitations of Cisco Layer 2 Resiliency, Hap’s RIFF Resiliency is a technology that will provide a network that is fully resilient, yet is also simpler to set up and manage. At the same time it uses the full capabilities ND bandwidth of each switch, ensuring greater overall efficiency in networking infrastructure.