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Ethernet Ring Protection (ERP) technology, which is defined in ITU-T Recommendation G.8032, has been developed to provide carrier grade recovery for Ethernet ring networks. However, the Filtering DataBase (FDB) flush method adopted in the current ERP standard has the drawback of introducing a large amount of transient traffic overshoot caused by flooded Ethernet frames right after protection switching. This traffic overshooting is especially critical when a ring provides services to a large number of clients. According to their experimental results, the traditional FDB flush requires a link capacity about sixteen times greater than the steady state traffic bandwidth.
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