A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : LSP Preemption Policies for MPLS Traffic Engineering
Author(s) : J. de Oliveira, et al.
Filename : draft-deoliveira-diff-te-preemption-04.txt
Pages : 17
Date : 2005-1-17
When the establishment of a higher priority LSP requires the
preemption of a set of lower priority LSPs, a node has to make a
local decision on the set of preemptable LSPs and select which LSPs
will be preempted, based on a certain objective, in order to
accommodate the newly signaled higher priority LSP. The preempted
LSPs are then rerouted by their respective Head-end LSR. A preempted
TE LSP can either be hard preempted (default mode as defined in
RFC3209) or soft preempted ([SOFT-PREPT]). In the former case, the
preemption results in clearing the corresponding state that provokes
a traffic disruption. In the later case (soft preemption), the Head-
end LSR of a soft preempted TE LSP is notified such that it can
perform a non-disruptive reroute, using the so-called ôMake before
breakö mechanism. This draft documents a preemption policy that can
be modified in order to stress different objectives: preempt the
lowest priority LSPs, preempt the minimum number of LSPs, preempt the
exact required bandwidth in order to fit the new LSP (or the set of
TE LSPs that provide the closest amount of bandwidth to the required
bandwidth for the preempting TE LSPs in order to minimize the
bandwidth wastage), preempt the LSPs that will have the maximum
chance to be reroutable. Simulation results are given and a
comparison among several different policies, with respect to
preemption cascading, number of preempted LSPs, priority, wasted
bandwidth and blocking probability is also included.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-deoliveira-diff-te-preemption-04.txt
To remove yourself from the I-D Announcement list, send a message to
i-d-announce-request@ietf.org with the word unsubscribe in the body of the message.
You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce
to change your subscription settings.
Internet-Drafts are also available by anonymous FTP. Login with the username
"anonymous" and a password of your e-mail address. After logging in,
type "cd internet-drafts" and then
"get draft-deoliveira-diff-te-preemption-04.txt".
A list of Internet-Drafts directories can be found in
http://www.ietf.org/shadow.html
or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
Internet-Drafts can also be obtained by e-mail.
Send a message to:
mailserv@ietf.org.
In the body type:
"FILE /internet-drafts/draft-deoliveira-diff-te-preemption-04.txt".
NOTE: The mail server at ietf.org can return the document in
MIME-encoded form by using the "mpack" utility. To use this
feature, insert the command "ENCODING mime" before the "FILE"
command. To decode the response(s), you will need "munpack" or
a MIME-compliant mail reader. Different MIME-compliant mail readers
exhibit different behavior, especially when dealing with
"multipart" MIME messages (i.e. documents which have been split
up into multiple messages), so check your local documentation on
how to manipulate these messages.
Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version of the
Internet-Draft.
- <ftp://ftp.ietf.org/internet-drafts/draft-deoliveira-diff-te-preemption-04.txt>
-
_______________________________________________
I-D-Announce@ietf.org
https://www1.ietf.org/mailman/listinfo/i-d-announce
