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Tunnel Congestion Exposure

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Lei Zhu , Huabing Zhang, Xiangyang Gong
Last updated 2013-04-18 (Latest revision 2012-10-15)
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


At present, tunneling technology has been widely applied in VPN, mobile communication network, IPv6 over IPv4, Mobile IP, multi-point delivery, and other fields. In the E2E link, there may already have been an effective congestion control mechanism, but we SHOULD also do traffic management in the tunnel to improve the performance of the entire network. Because of the particularity of the scenario of the tunnel, the existing E2E traffic management mechanism cannot be directly be deployed (e.g. VPN, IPv6 over IPv4 etc). In these cases, this document focuses on how to expose the congestion while the feedback mechanism is left for later study. This document describes the problem of identifying congestion in a tunnel segment of an end-to-end flow. A basic tunnel congestion exposure model is then described, followed by three example scenarios which use the basic model to derive tunnel congestion. Finally, a general solution that can be applied to IP-in-IP tunnels is described.


Lei Zhu
Huabing Zhang
Xiangyang Gong

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)