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because the group Intserv is no longer active.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