Re: [OPSAWG] comments on draft-georgiades-opsawg-intercar-oam-req-00

[Michael Georgiades <[e-mail]>]

Dear Hannes,

The points you are raising are of interest, however they are more
related on how to monitor performance degradation for the different
transport technologies offered by a single carrier as opposed to
inter-carrier requirements which we have tried to differentiate. The
mentioned issues should also be considered when dealing with
inter-operability issues between carriers using different transport
technologies. However we avoided inter-operability or technology
oriented requirements for this draft as this should be addressed by the
SLA agreement between the carriers.

Maybe though we can add a requirement that the Maintenance Entity at
each carrier should make inter-carrier service OAM independent of
transport technologies. David?

Cheers,

Michael

On 07/04/2011 04:38 PM, Berechya, David (NSN - IL/Hod HaSharon) wrote:
>   Dear Hannes,
>
> Regarding service aspects in OAM: there are OAM in the service level
> that monitors the service end-to-end, and OAM in the network level that
> monitors the paths that carry many services.
>
> Regarding the scope of the draft: the draft focuses in the special
> requirements that the multi carrier scenario raises, e.g.  Reliable
> means to the network service providers to prove, in case of failure,
> which is the failing transit segment.
>
> Best Regards,
> David Berechya
>
> -----Original Message-----
> From: [e-mail] [mailto:[e-mail]] On Behalf
> Of ext Weisgrab, Hannes [Lists]
> Sent: Wednesday, June 29, 2011 12:50 AM
> To: [e-mail]
> Subject: [OPSAWG] comments on
> draft-georgiades-opsawg-intercar-oam-req-00
>
>
> Dear list members,
>
> as this is the first time I post to this list I'd like to briefly
> introduce myself.
> I'm researcher at the Telecommunications Research Center Vienna (FTW;
> http://www.ftw.at) and I'm involved in the EU FP7 project ETICS
> (http://www.ict-etics.eu/). In this project we investigate - among other
> things - how QoS can be enabled across domains utilizing different
> transport technologies (above all: connection oriented AND connection
> less technologies). In this respect we also deal with network monitoring
> and SLA assurance (the latter of which is the final goal).
>
> My core concern is that I think it could be beneficial if an
> inter-carrier OAM system would be aware of the (network transport)
> services and the way how they are transported at a given interconnection
> point. I further assume that such an interconnection point (link) would
> also make a perfect monitoring point.
> But how to identify the various (network transport) services and the way
> they are transported via this point?
>
> Let me explain this in more detail:
> If two or more providers want to offer a QoS-enabled (network transport)
> service they also need to agree on a mechanism to transport this service
> through their networks. There are various mechanisms which could be used
> like utilizing the DSCP field of the IP-header (*) or using tunneling
> (e.g. IP-in-IP [RFC2003], GRE [RFC2784], or even other mechanisms, which
> are proprietary or not yet standardized).
> However, if such mechanisms are applied between domains, this
> information needs to be transferred also to the monitoring device, which
> could be external to the router (which would be beneficial both in terms
> of trust and router (CPU) utilization).
> Without information about the transported services and the exact way
> they are transported, the monitoring capability would be reduced to
> simple link monitoring, which would be of much less benefit for the
> operator.
>
> I'm not so familiar with the OAM topic and if there are already
> discussions in this direction, so I was wondering, if this topic has
> already been addressed or if this could possibly be another requirement?
>
> Looking forward to your comments, br,
> Hannes Weisgrab.
>
>
> (*) various RFCs are related to this, like:
> RFC791 ;-)  , RFC2474, RFC2983 ,RFC4594, ...
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--
Dr Michael Georgiades
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