[PCN] main changes in draft-ietf-tsvwg-rsvp-pcn-02

<karagian@cs.utwente.nl> Fri, 13 July 2012 06:13 UTC

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From: <karagian@cs.utwente.nl>
To: <tsvwg@ietf.org>, <pcn@ietf.org>
Thread-Topic: main changes in draft-ietf-tsvwg-rsvp-pcn-02
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Date: Fri, 13 Jul 2012 06:14:04 +0000
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Subject: [PCN] main changes in draft-ietf-tsvwg-rsvp-pcn-02
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Hi all,



The 02 version of the RSVP-PCN draft has been submitted last week to the IETF, see below:



http://www.ietf.org/id/draft-ietf-tsvwg-rsvp-pcn-02.txt



All comments received up to now are worked out!
The main changes compared to version 02 version are:



=> Main change 1: The draft is written in such a way that the following two assumptions do not anymore apply!



o) Assumption 1: More than one IEAs between same pair of PCN edge nodes should be supported, each of them using a different PHB-ID value
Why?: A requesting individual flow has a higher chance to be admitted to an IEA that is NOT in PCN-admission-state How? When IEA supported by a PCN-ingress-node is in PCN-admission state, then based on local policy, requesting e2e RSVP session (individual flow) should be either rejected or mapped to another IEA that is NOT in PCN-admission-state

In particular, the IEA definition used in PCN is not modified. Moreover each RSVP generic aggregated state is mapped/matched to only one IEA.

o) Assumption 2: PCN-ingress-node should be able to reduce bandwidth of an individual flow without terminating the flow
Why?: flows will not be terminated unnecessary and at the same time the IEA bandwidth is reduced to solve the severe congestion
How?: When for IEA supported by PCN-ingress-node incoming traffic needs to be reduced then:
based on a local policy and for same IEA, selects a number of e2e RSVP sessions (individual flows) to be either terminated or reserved bandwidth of e2e RSVP sessions (individual flows) is reduced.

In particular, it is emphasized that the default manner of  how the IEA bandwidth is reduced during flow termination is based on the description given in the SM and CL edge behavior drafts.



=> Main change 2: The open issue given on page 18 in draft-ietf-tsvwg-rsvp-pcn-01 is removed. According to the discussion that we had on the mailing list, the First option was selected. The PCN objects of C-Type:  RSVP-AGGREGATE-IPv4-PCN-CL-FLIDs or RSVP-AGGREGATE-IPv6-PCN-CL-FLIDs MUST be carried by the
aggregated Resv message.





=> Other changes: Terminology section is updated according to the last versions of SM and CL drafts.
Some editorials are fixed.





For more details on differences between draft-ietf-tsvwg-rsvp-pcn-01 and draft-ietf-tsvwg-rsvp-pcn-02,  please see:

http://tools.ietf.org/rfcdiff?url2=draft-ietf-tsvwg-rsvp-pcn-02

Comments are appreciated!

Best regards,
Georgios