Document shepherd write-up:
Network Transport Circuit Breakers
Document Shepherd: David Black
Responsible AD: Spencer Dawkins
This document explains what is meant by the term "network transport
Circuit Breaker" (CB). It describes the need for circuit breakers
when using network tunnels, and other non-congestion controlled
applications. It also defines requirements for building a circuit
breaker and the expected outcomes of using a circuit breaker within
The WG has requested Best Current Practice status because this draft
provides protocol design (and in some cases, operational) guidelines
for the Internet. This request is the rough consensus of the WG.
2. Review and Consensus
The Transport Area WG (TSVWG) is a collection of people with varied
interests that don't individually justify their own working groups.
This draft is strongly supported by the portion of the TSVWG that is
concerned with congestion, and has received reviews and discussions from
several experts within that community. Overall support for this draft
comes from about a dozen members of the WG, which is relatively broad
support for a TSVWG draft. Discussion in TSVWG has not been controversial;
the draft has evolved moderately from the initial -00 version that the
WG adopted about a year ago, with no major objections to its content in
In contrast, the circuit breaker concept has been controversial in other
IETF forums, with strong opposition observed to imposing circuit breaker
support as a protocol design requirement. The concept of a managed
circuit breaker is intended to allow response via a different control-plane
protocol or via other mechanisms such as OAM and/or network operator
monitoring of service delivery. The shepherd expects this issue to
resurface at IETF Last Call, and is accordingly dusting off his (virtual)
There is complementary work elsewhere in the IETF, e.g., the RTP circuit
breaker activity in the AVTCORE WG.
3. Intellectual Property
The draft author has stated his direct, personal knowledge that any IPR
related to this document has already been disclosed, in conformance with
BCPs 78 and 79.
4. Other Points
idnits 2.13.02 ran clean on the -04 version.
There are no DOWNREFs or IANA Considerations.
The IESG should take note of the potential controversy surrounding the
circuit breaker concept in general (see Section 2 above).