The ITU recommend the following levels: 5,6,7 = Customer 3,4 = Provider 1,2 = Operator 0 = Local segment I don't know if there are any rules of thumb for the CCM interval - faster is more sensitive & unstable, slow is sluggish but stable. The spec allows between 3.33 ms and 10 minutes in 7 steps, with 1s being the midpoint. So we use 1s intervals. I'm not sure if the other parameters you mention are configurable for CCM. I think the packet has a constant size. Are you wanting to also do Y.1731 performance management? Jonathon
-----Original Message----- From: Adam Vitkovsky [mailto:adam.vitkovsky@swan.sk] Sent: Wednesday, 26 September 2012 9:29 p.m. To: nanog@nanog.org Subject: Ethernet OAM BCPs Please are there any yet???
Hi Are there any best common practices for the CFM levels use Since my pure Ethernet aggregation layers are small I believe I only need two CFM levels I plan on using Level 5 between CPEs managed by us and Level 4 between Aggregation devices -that's where MPLS PWs kicks in So leaving Level 7 and Level 6 for customers and carrier-customers respectfully -would this be enough please?
I'm also interested on what's the rule of thumb for CCMs Frequency, Number of Packets, Interpacket Interval, Packet Size and Lifetime for the particular operation Thanks a lot for any inputs
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