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RFC 7893
Title: Pseudowire Congestion Considerations
Author: Y(J) Stein, D. Black, B. Briscoe
Status: Informational
Stream: IETF
Date: June 2016
Mailbox: yaakov_s@rad.com,
david.black@emc.com,
ietf@bobbriscoe.net
Pages: 27
Characters: 54380
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-pals-congcons-02.txt
URL: https://www.rfc-editor.org/info/rfc7893
DOI: http://dx.doi.org/10.17487/RFC7893
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. Thus, it is 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 Time Division Multiplexing (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, and is typically much lower, than this bound.
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. If the TDM service does not
automatically shut down, a mechanism to block persistently
unacceptable TDM pseudowires is required.
This document is a product of the Pseudowire And LDP-enabled Services Working Group of the IETF.
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