The IEEE 802.1ab ETH-LB is unicast message used to check whether a fault occurs on the link between the local and peer terminal equipment. On receiving the loopback message, the endpoint checks whether conditions are met. If so, the receive node returns a loopback reply (LBR) packet (another unicast MAC message) to the originating device. The source node reports an alarm if it does not receive any LBR within five seconds after sending the LBM. As intermediate nodes perform only Layer 2 forwarding, LBMs can carry additional data that must be returned in LBRs without change. LBMs can therefore also be used for traffic test purposes.
Please enter your details in the form below.
Metaswitch is the world’s leading cloud native communications software company. The company develops commercial and open-source software solutions that are constructively disrupting the way that service providers build, scale, innovate and account for communication services. By working with Metaswitch, visionary service providers are realizing the full economic, operational and technology benefits of becoming cloud-based and software-centric. Metaswitch’s award-winning solutions are powering more than 1,000 service providers in today’s global, ultra-competitive and rapidly changing communications marketplace.