Encoding Three Pre-Congestion Notification (PCN) States in the IP Header Using a Single Diffserv Codepoint (DSCP)

نویسندگان

Bob Briscoe

Toby Moncaster

Michael Menth

چکیده

The objective of Pre-Congestion Notification (PCN) is to protect the quality of service (QoS) of inelastic flows within a Diffserv domain. The overall rate of PCN-traffic is metered on every link in the PCNdomain, and PCN-packets are appropriately marked when certain configured rates are exceeded. Egress nodes pass information about these PCN-marks to Decision Points that then decide whether to admit or block new flow requests or to terminate some already admitted flows during serious pre-congestion.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Short Overview of Differentiated Services

While Integrated Services provides per-flow guarantees, Differentiated Services (DiffServ) [1] follows the philosophy of mapping multiple flows into a few service levels—an approach sometimes referred to as Class of Service (CoS). DiffServ does not define any signaling mechanisms, but instead, packets are marked with a DiffServ Code Point (DSCP), which provides information about the QoS request...

متن کامل

Baseline Encoding and Transport of Pre-Congestion Information

The objective of the Pre-Congestion Notification (PCN) architecture is to protect the quality of service (QoS) of inelastic flows within a Diffserv domain. It achieves this by marking packets belonging to PCN-flows when the rate of traffic exceeds certain configured thresholds on links in the domain. These marks can then be evaluated to determine how close the domain is to being congested. This...

متن کامل

Task Force ( IETF ) G . Karagiannis

The objective of Pre-Congestion Notification (PCN) is to protect the quality of service (QoS) of inelastic flows within a Diffserv domain. On every link in the PCN-domain, the overall rate of PCN-traffic is metered, and PCN-packets are appropriately marked when certain configured rates are exceeded. Egress nodes provide decision points with information about the PCN-marks of PCN-packets that al...

متن کامل

Internet Engineering Task Force (ietf) Pre-congestion Notification (pcn) Boundary-node Behavior for the Single Marking (sm) Mode of Operation

Pre-Congestion Notification (PCN) is a means for protecting the quality of service for inelastic traffic admitted to a Diffserv domain. The overall PCN architecture is described in RFC 5559. This memo is one of a series describing possible boundary-node behaviors for a PCN-domain. The behavior described here is that for a form of measurement-based load control using two PCN marking states: notm...

متن کامل