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802.1ag
IEEE standard 802.1ag, also known as “Connectivity Fault Management” or CFM, divides a network into maintenance domains in the form of hierarchy levels. Both of these are then allocated to users, service providers and operators. CFM then assigns maintenance end points (MEPs) to the edges of each domain and maintenance intermediate points (MIPs) to ports within domains. This helps define the relationships between all entities from a maintenance perspective, to allow each entity to monitor the layers under its responsibility and easily localize problems.
The following procedures are included in IEEE 802.1ag standard:
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Connectivity check
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Remote loopback testing
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Link trace testing
802.1ag over Fiber
RAD’s EtherAccess® Ethernet network termination units and demarcation devices feature advanced Ethernet OAM functionalities, including IEEE 802.1ag connectivity fault management to enable service providers fully monitor their Ethernet services, regardless of the layers supporting it, the network path over which Ethernet traffic is traversing, or the various network operators involved. These devices also help carriers reduce maintenance costs by avoiding expensive truck rolls to locate and contain faults. The EtherAccess demarcation devices offer consistent 802.1ag support over copper, fiber and DSL media.
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