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List:       ietf
Subject:    Re: SLA concept in Intserv/RSVP
From:       Alex Audu <Alex.Audu () alcatel ! com>
Date:       2002-04-23 15:55:04
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Refer to this excellent tutorial on QoS to answer your questions:   "Internet QoS: A \
Big Picture" by Xipeng Xiao and Lionel M. Ni.  IEEE Network. March/April 1999.

Alex.

Nguyen Thi Mai Trang wrote:

> Hi everybody,
> 
> I have a question about the notion of SLA (service level agreement) in Intserv/RSVP \
> but I don't know where to post it because the group Intserv is no longer active.
> 
> It seems that the notion SLA was born in Diffserv architecture. The SLA is \
> necessary because network resources are statically provisioned. It's very clear.
> 
> In Intserv/RSVP, I don't find the SLA/SLS (service level specification) concept in \
> all concerning draft/RFCs . I wonder if there is no SLA/SLS concept in \
> Intserv/RSVP, how we can make policy decision in Intserv/RSVP. 
> Some clarifications:
> In Intserv/RSVP, client uses RSVP to request resource in the routers. The routers \
> verify if it has sufficiently resources (Admission control) and the user has the \
> right to request this amount of resource (Policy control) or not. If both are \
> positives, it makes the resource reservation for this flow. My question is that if \
> there is no SLA/SLS, how the network can answer (using COPS-RSVP for example) to \
> the question "Does this client has the right to request such a reservation ?" ?
> 
> Thank you very much,
> Mai Trang


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