ETH OAM Session

The ITU-T Y.1731 and IEEE 802.1ag standards define an Operations, Administration and Maintenance (OAM) framework for Ethernet based networks and defines OAM functions for fault management and performance monitoring. Prosilient supports the following Ethernet OAM functions:

· Ethernet Loopback (ETH-LB)

The ETH-LB session is setup between a probe and a ITU-T Y.1731 (or IEEE 802.1ag) enabled network device to measure and verify bi-directional connectivity between the probe and network devices (MEP to MEP/MIP). The ETH-LB function measure and report round-trip time (RTT), RTT variation, packet loss, reordered and duplicated packets based on two-way measures.

· Frame Delay Measurement (ETH-DM)

The ETH-DM session is setup between a probe and a ITU-T Y.1731 enabled network device to measure and verify bi-directional connectivity between the probe and network devices (MEP to MEP/MIP). The ETH-DM function measure and report round-trip time (RTT), RTT variation, one-way propagation delay for both uplink and downlink directions. Further, packet loss, reordered as well as duplicated packets are measured and reported based on two-way measures.

· 2xOneWay in Vendor Specific PDU

Prosilient provides an enhanced bi-directional measurement function for L2 network by implementing Prosilient's 2xOneWay session as a vendor specific OAM PDU (ETH-VSP). This function will measure and report all metrics (delay, jitter, loss, etc) based on one-way measures.

The figure below shows an example of Ethernet OAM measurements between a probe and two ITU-T Y.1731 (or IEEE 802.1ag) enabled network elements: