The IESG has received a request from the Pseudowire And LDP-enabled Services WG (pals) to consider the following document: - 'Pseudowire Congestion Considerations' <draft-ietf-pals-congcons-01.txt> as Informational RFC The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the ietf@ietf.org mailing lists by 2015-12-15. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. Abstract Pseudowires (PWs) have become a common mechanism for tunneling traffic, and may be found in unmanaged scenarios competing for network resources both with other PWs and with non-PW traffic, such as TCP/IP flows. It is thus worthwhile specifying under what conditions such competition is acceptable, i.e., the PW traffic does not significantly harm other traffic or contribute more than it should to congestion. We conclude that PWs transporting responsive traffic behave as desired without the need for additional mechanisms. For inelastic PWs (such as TDM PWs) we derive a bound under which such PWs consume no more network capacity than a TCP flow. For TDM PWs, we find that the level of congestion at which the PW can no longer deliver acceptable TDM service is never significantly greater than this bound, and typically much lower. Therefore, as long as the PW is shut down when it can no longer deliver acceptable TDM service, it will never do significantly more harm than even a single TCP flow. We propose employing a transport circuit breaker to shut down a TDM PW that persistently fails to comply with acceptable TDM service criteria. The file can be obtained via https://datatracker.ietf.org/doc/draft-ietf-pals-congcons/ IESG discussion can be tracked via https://datatracker.ietf.org/doc/draft-ietf-pals-congcons/ballot/ No IPR declarations have been submitted directly on this I-D.