Ethernet OAM BCPs Please are there any yet???
adam.vitkovsky at swan.sk
Thu Sep 27 07:39:29 UTC 2012
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
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
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
- 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
- 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
From: Jonathon Exley [mailto:Jonathon.Exley at kordia.co.nz]
Sent: Wednesday, September 26, 2012 6:34 PM
To: nanog at 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
> -----Original Message-----
> From: Adam Vitkovsky [mailto:adam.vitkovsky at swan.sk]
> Sent: Wednesday, 26 September 2012 9:29 p.m.
> To: nanog at nanog.org
> Subject: Ethernet OAM BCPs Please are there any yet???
> 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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