Thank you so much Jonathon. This is exactly what I what I was searching for. Oh and yes I should have mentioned I'd like to do the Y.1731 and measure the delay and delay variance Just yesterday evening I found a great article about how ATT did theirs active measurements though for IP - wondering if I could do the same for my Y.1731 They used dedicated servers and I'll be running this form the routers ME3600X and CX and ASR9K so I'm a bit worried about the scaling of the whole thing ATT basically used two probes and each 24-hour day is divided into 96 test cycles of 15 minutes A Poisson probe sequence of duration equal to the test cycle characteristics: - Poisson distribution with average interarrival time of 3.3 s - Packet size of 278 bytes, including headers - UDP protocol Two periodic probe sequences in every test characteristics: - Interval of 20 ms between successive packets (or 50 packets/s) - 1 min duration - Random start time within the 15 min cycle - Packet size of 60 bytes (including headers) - UDP protocol adam -----Original Message----- From: Jonathon Exley [mailto:Jonathon.Exley@kordia.co.nz] Sent: Wednesday, September 26, 2012 6:34 PM To: nanog@nanog.org Subject: RE: Ethernet OAM BCPs Please are there any yet??? 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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