A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Pseudowire And LDP-enabled Services Working Group of the IETF.
Title : Pseudowire Congestion Considerations
Authors : Yaakov (Jonathan) Stein
David L. Black
Bob Briscoe
Filename : draft-ietf-pals-congcons-01.txt
Pages : 24
Date : 2015-10-04
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 IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-pals-congcons/
There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-pals-congcons-01
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https://www.ietf.org/rfcdiff?url2=draft-ietf-pals-congcons-01
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