![]() Through all these mechanisms, Allied Telesis switches keep your network safely loop- and storm-free without compromising service or reliability. RSTP is enabled by default on all switch ports. You can add BPDU Guard to provide extra protection for edge ports. We’ll work with you to help you find the right tools for all your loopback needs. If you have any questions about loopback interfaces, then contact your Sweetwater Sales Engineer at (800) 222-4700. These protocols use special frames, called BPDUs, to constantly check link status and work out the best paths available. We hope this guide has sparked some ideas about how you can start using loopback in your online content and audio productions. Loopback tests can be performed by wide area network (WAN) access devices such as CSU/DSUs (Channel Service Unit/Data Service Units) and routers to place calls to themselves over a WAN to test the integrity of the WAN link. AlliedWare Plus supports the original STP protocol, the faster RSTP (Rapid STP), and MSTP (Multiple STP) for large networks. Other topologies can be protected with the popular Spanning Tree Protocol (STP). Both can react to changes in topology as fast as 50 ms, so end users don’t even notice a link failure. AlliedWare Plus offers two protocols to protect your ring from loops: the standards-based G.8032 Ethernet Ring Protection and our own Ethernet Protection Switching Ring (EPSR). ![]() Ring topologies are popular in networks that need a high level of resiliency. AlliedWare Plus supports several of these protocols, for ring and other topologies. ![]() To take advantage of this, you need to use a layer 2 protocol that manages the paths, blocking and unblocking ports as needed to create a single logical path at any time. If there are multiple possible paths to each destination, if a link fails, traffic can simply change to another path. Physical loops are useful in networks, because they provide backup, which makes a network resilient if a device or link fails.
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