Circuit Breaker Assisted Congestion Control (CBACC): Protocol Specification

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Last updated 2017-10-25 (latest revision 2017-04-23)
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This document specifies Circuit Breaker Assisted Congestion Control (CBACC), which provides bandwidth information from senders to intermediate network nodes to enable good decisions for fast-trip Network Transport Circuit Breaker activity ([I-D.ietf-tsvwg-circuit-breaker]) when necessary for network health. CBACC is specifically designed to support protocols using IP multicast, particularly as a supplement to receiver-driven congestion control protocols to help affected networks rapidly detect and mitigate the impact of scenarios in which a network is oversubscribed to flows which are not responsive to congestion.


Jake Holland (

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