Hi ccamp!
Thanks to Lyndon Ong, Deborah Brungard, and Dimitri Papadimitriou we
can now read about the ccamp meeting, IETF61.
Please provide your comments no later than 3rd December if you miss any
important wording (or you like to change the complete meeting;-)
/ Tove
Tove Madsen
Acreo AB
tove.madsen@acreo.se
===
61st IETF CCAMP Minutes
11/11/2004
Minutes taken by
Lyndon Ong, Deborah Brungard, Dimitri Papadimitriou
1. Admin and agenda bash - Chairs (5 min)
Agenda bashing - no changes
2. Status of WG drafts - Adrian (10 min)
Drafts - now unblocked, however the removal of the MPLS bundling draft has
caused another snag. We have got two new RFCs, Architecture (3945) and
SONET/SDH Extensions (3946). Six drafts are in the queue. Five are in
IETF
Last Call, two are in IESG review. 15 active drafts - if you want a draft
adopted as WG draft, let's finish these first! Tunnel trace in particular
seems to have very little interest - will be discussed wrt to rechartering.
Overall status: almost all milestones completed, should recharter or close
in March '04!
Lou - slide does not list all 15 drafts - others are still active? In
particular Alarm_Spec
Adrian said no intention to exclude, asked if implementation on alarm
draft,
Lou said at least one, possibly two, Kireeti said only need one, so Ok
to go
forward.
Adrian - Note: Node_Id based Hello has not been updated before deadline
Adrian - Milestones and re-chartering will be covered at the end of the
meeting.
3. Link Bundling - Zafar Ali
-- Issues with current RFCs and drafts
-- Draft removed from the RFC editor's queue
-- Issues with scooping type 4/5 TLVs for IF_ID_RSVP_HOP and
IF_ID_ERROR_SPEC, also recording of route
-- Plan to address first two issues in an updated draft but component link
recording will remain outside the scope of the bundling draft. Will allow
but recommend against use of types 4/5.
-- Work on recording/explicit control will be done in a separate ID. Home
in MPLS or CCAMP?
-> see slides
-- Plans
Pulled from queue (reviewed slides)
-- Adrian: procedure -> MPLS WG own document. Do review on what happens in
this WG
Note: speed is really important as we have multiple blocking documents in
the CCAMP WG queue.
-- Kireeti - this is not free for all on the bundling draft - change to be
proposed and to be sent on the list (delta only)
George: as MPLS chair, MPLS group plans to do updates quickly - considered
as last call comments
4. ASON Signaling Solutions - Dimitri P (5min)
<http://www.ietf.org/internet-drafts/draft-ietf-ccamp-gmpls-rsvp-te-ason-02.
txt>
<http://www.olddog.co.uk/draft-dimitri-ccamp-gmpls-ason-routing-eval-00.txt>
-- Mention OIF response is on the way
-- ASON signaling - no updates but lots of thinking esp. call setup message
naming (Notify vs. specialized message), desire not to "piggyback" call
information in the connection message. Expect finalized draft around
Christmas time.
-- ASON routing solutions design team
- Evaluation of common "pattern" has taken time, evaluation document should
be issued by end- November.
- Model shown - use of terminology - what is TE Router ID, what is OSPF
Router ID?
- Further considerations - control plane does not transport the actual
transport plane ids, but its view of the transport plane, using an
associated IP addressing space.
- No internal structure is associated with an abstract node.
- Hierarchy focus is on exchange of information between peers.
- Representation of bandwidth needs further thought.
-- Adrian - it seems the DT has been making good progress, CCAMP WG has
unfortunately not been aware of the progress, progress must be shown to the
group by either sending status or updating the draft.
-- Dimitri - will mail to the list.
-- Zafar - how does this work relate to the OSPF and ISIS groups?
-- DP - we are evaluating what may be missing, after this evaluation we can
address protocol-specific issues.
-- Zafar - Are you looking at existing mechanisms?
-- Dimitri - global applicability is next step, currently looking at what
info is exchanged
5. ITU Liaison - Lyndon Ong
-- ITU continues to be interested in converging the work on signaling and
routing
-- ITU thanks CCAMP for its liaisons, and esp. Adrian for attending the
last
Q14 meeting
-- ITU is currently working on ASON management specifications and thanks
CCAMP for its liaison of the GMPLS MIB work for its review
-- Zafar - can we also have a report of OIF status? Chairs and LO;
there is
nothing formal to report at this time that's why it was not scheduled on
the
agenda. However, liaisons will be sent to the mailing list for everyone's
review, and if something formal is made available, it will be scheduled.
-- Lyndon - there is ongoing discussion and communication just sent back to
IETF
-- Adrian - but not there yet (not available)
-- Lyndon - is there a need for a permanent liaison from the OIF at the
CCAMP meeting?
-- Adrian - if there is something to be discussed it will be considered
on a
per-request/per-case basis
6. Graceful Shutdown - Zafar Ali (10 min)
http://www.ietf.org/internet-drafts/draft-ali-ccamp-mpls-graceful-shutdown-0
0.txt
-- Intention is to support a planned shutdown, e.g., for maintenance
purposes
-- IGP based solution does not cover Inter-AS/Area scenarios
-- RSVP-based solution does not convey information to all nodes in the
network.
-- Both mechanisms must complement each other
-- Use existing sub-code of the Path Error message, then perform
make-before-break for the LSP. Proposed changes are minor and based on
existing framework.
-- Would like to propose this ID as a WG document
Rahul- is this intra or inter? inter-domain can use hierarchy of LSPs
(nesting/stitching) to achieve this isolation.
-- Zafar - though recognize two mechanisms
-- Rahul- we should clarify these aspects, as well as inter-domain TE
aspects.
-- Zafar - can add these aspects in the document
-- Richard Rabbat - why is this GMPLS rather than MPLS?
Zafar - could be shutting down any type of link.
-- Adrian - in terms of problem space it is needed in both cases
-- Igor Bryskin - this is a data plane problem followed by rerouting - why
don't we use existing mechanisms such as propagating alarms?
Zafar - distinguish this from alarms as this is not something that requires
an immediate reroute. This is not intended to tackle data plane alarms
-- Kireeti - maintenance of the link/node - out-of-service issue is to get
traffic out of the link
Igor- alarms do not only mean "failure". Could it use alarm severity?
-- Kireeti - not an alarm situation.
-- Adrian - this is maintenance alarm => requires to scope the work
-- Igor - Tools already exist to trigger the same thing, the existing tools
are more powerful than this proposed one
-- Zafar - point to the capability of the mechanism having the
indication to
perform make-before-break - also suggest put on the list what you think are
alternative mechanisms
-- Lou Berger - says if we do this, we should use existing mechanisms such
as admin status or alarm (Arthi's suggested one, Igor's alarm admin
status).
-- Zafar - this mechanism is already in the spec - JP's re-optimization
draft
-- Lou - other mechanisms are in RFCs. We should decide on mechanisms
before
we accept as a WG draft.
-- Kireeti - step back from the solution, so the point is to write down
what
is to be achieved (take things out gracefully) -> need first to look at
requirements for what want to do.
-- Zafar - agreement
7. Interdomain Framework - Adrian (5min)
<http://www.ietf.org/internet-drafts/draft-ietf-ccamp-inter-domain-framework
-00.txt>
-- Minor changes since last time, but published as WG draft
-- Applies to both MPLS and GMPLS, but currently limited to simpler
functions for initial work
-- Realize need more discussion on definition of "domain" e.g. Nested
domains, ensure GMPLS included. Will take to list for discussion.
-- This covers "simple" functions, what about "advanced" functions such as
diverse paths, mapping domain-specific constraints such as DiffServ,
pt-to-mpt, etc.?
-- Adrian's suggestion is to keep this separate for convenience.
-- Rahul - MPLS OAM - building blocks are in place, so it can go in this
document; P2MP is considerably less well understood.
-- Kireeti - what about GMPLS OAM?
-- Dimitri - need to understand what we mean by GMPLS OAM. Suggest phased
approach.
8. Interdomain TE Requirements - Tomohiro Otani (5min)
<http://www.ietf.org/internet-drafts/draft-otani-ccamp-interas-gmpls-te-01.t
xt>
-- Joint proposal from NTT/KDDI, can be used for L1VPN, MPLS-TE
-- Changes: added section identifying the following general requirements
- EGP extensions for GMPLS
- GMPLS Inter-AS signaling, path calculation and recovery
- GMPLS interdomain TE management
-- Remaining issues:
- Investigate added load created by EGP extensions
- Investigate L1VPN, use of SRLG for consistency, rechartering impacts
- Propose WG document
- Zafar - recommended would be a good basis for inter-domain TE framework
-- Arthi- support effort, but has too many solutions-related aspects in it.
Also suggest separating requirements into signaling, routing and path
computation. Need to clarify what is meant by domain - refer to framework
document.
-- Dimitri - what about reachability information exchange? Not addressed,
but will be an important aspect.
-- Adrian- this is solution, not requirements. Suggest to separate
requirements and solutions. General approval of the work, but need to
remove
solutions. Should consider reachability as well as TE aspects. Restructure
as Arthi suggests.
-- Otani- agree, will separate
-- Kireeti summarizing: separate requirements from solution and structure:
signaling from routing (in part. reachability)
9. Summarize Status and plans of PCE BOF (JP Vasseur) (5 minutes)
-- Scope issues
- No intent to come up with new interdomain routing paradigm
- Scoped applicability to a limited number of TE LSPs
- Scoped to a "simple" topology of ASes or areas
-- Previous BOF - clear requirements from many SPs and common theme of
problem - MPLS TE LSP path computation
-- Architecture - comments noted global picture needed, but no
standardization of architecture. New revision to be submitted soon in the
meantime please comments!
-- Note agreed no intention to extend LDP, but possibly other protocols.
-- Agreed on proposed charter and milestones, proposal to be sent out early
next week.
-- Many in favor of new WG, none against - need IESG review and work on
charter
-- Bijan Jabbari - what scale of LSPs?
-- JP - no specific number, not full mesh - does this mean no scalability
concerns?
-- Adrian - need to make the problem manageable, at least initially.
-- Bijan - will WG be open to new architectures?
-- Kireeti - take this to the list.
-- Peter Toms - support this, lots of requests for this.
10. Inter-Domain RSVP-TE extensions - Arthi Ayyangar (5min)
<http://www.ietf.org/internet-drafts/draft-ayyangar-ccamp-inter-domain-rsvp-
te-00.txt>
-- Changes - include separate section on stitching and required extensions,
clarifications for non-packet LSPs.
-- Request to make it a WG document - none against, but limited number
agreeing (note: not many read the draft)- list.
-- Adrian - stitching has wider applicability - should we pull it out
into a
separate draft?
11. Diverse Inter-region Setup - D'Achille - presented by Adrian (5 min)
<http://www.ietf.org/internet-drafts/draft-dachille-inter-region-path-setup-
04.txt>
-- Adrian not that familiar with this draft. Flags one slide on message
exchange where the head end is in the center rather than at the end. Notes
several claim, explicitly claim of no new protocol seems questionable as
new
objects are defined. Need further feedback.
Can't take questions as no authors present to discuss - take to list
12. Related to 11. Protection for Inter-AS tunnels - Decnodder - Cristel
Pelsser
<http://www.ietf.org/internet-drafts/draft-decnodder-ccamp-interas-protectio
n-00.txt>
-- Differs from 11, addresses requirements from TEWG draft
-- Uses RSVP-TE and FRR
-- Adds clarifications on SRLG scope, assumed to correspond to a single AS
-- Looking for feedback, how to generalize to GMPLS
-- Adrian - need to apply to GMPLS if you want the draft to be in this
group.
-- Zafar - SRLG issue - need to solve the scooping issue, applies in a
number of places.
-- Adrian - WG should look at a framework for diverse paths, including PCE.
-- Zafar - needs more discussion to understand, and already work in MPLS WG
on ABR protection.
-- Adrian - authors can continue draft, would also like for CCAMP to
evaluate if PCE is appropriate, or something else
-- JP - should include the PCE mailing list on this.
-- Adrian - need discussion on the ccamp list.
13. Requirements for multi-region - Kohei Shiomoto
<http://www.ietf.org/internet-drafts/draft-shiomoto-ccamp-gmpls-mrn-requirem
ents-00.txt>
-- Region defined based on switching capability - note region is control
plane, layer is data plane
-- Addresses pre-provisioned FA, triggered FA and no FA cases. Plain and
hybrid type nodes.
-- Architecture has generated requirements and solutions drafts
-- Virtual network topology, application example
-- Propose as WG document.
-- Adrian - handling regions are in scope of CCAMP.
-- Adrian - asks Dimitri to immediately present the extensions then we will
take questions
<http://www.ietf.org/internet-drafts/draft-shiomoto-ccamp-gmpls-mrn-extensio
ns-00.txt>
-- TE metric inheritance - how to inherit or map metrics
-- How is recovery abstracted for an FA - e.g., end2end vs. span protected?
-- Reconvergence of VNT
-- Handling multiple switching and adaptation capabilities
-- Zafar - is this a good idea from TE point of view - dynamic FA
creation -
need applicability statement - potential bandwidth segmentation issues -
may
lose aggregation that you would normally get at the boundary - could add
oscillation. If still considered a good idea, should it be triggered by
signaling or some other mechanism? Document needs to list concerns.
-- Arthi - some parts of requirements still not clear - what is needed
outside of the LSP hierarchy draft? Need to clarify what is missing from
the existing, and reference where it's covered by existing documents.
Don't
want to reinvent terminology. Regarding virtual FA setup can be
pre-provisioned or on demand - hierarchy draft already says this, should
not
be in the requirements document but only in the solutions document.
Regarding protection - more work needs to be done in the requirements.
-- Igor - region, layer, hierarchy level are treated interchangeably in the
draft, confusing. Regarding stitching, this is a very general capability
and should be in LSP hierarchy instead. Kireeti - thinks this should have a
separate document.
-- Adrian - more clarification would be good on layer/region
-- Jonathan Sadler - good stuff in general, agree with the goal.
Concern is
that IETF framework is not well aligned to ITU concept of layered network
(G.805). It would be good to take into account the ITU framework. Work on
extensions is premature at this time.
-- Deborah Brungard - authors intended to handle multiple layers as in ITU
(e.g. G.805) - limited to single domain for now, should be addressed to
GMPLS RFCs. Not intended to discuss data plane concepts. Request for more
specific comments.
14. MPLS-to-GMPLS Migration - Kohei Shiomoto
<http://www.ietf.org/internet-drafts/draft-oki-ccamp-gmpls-ip-interworking-0
4.txt>
-- Evolution from legacy MPLS to GMPLS -
-- Differences: architecture (C/D separation, bidirectionality, P&R);
routing (opaque LSA); signaling (new objects, messages)
-- Propose WG document
-- Kireeti - question on whether this is in scope - address on charter
-- Zafar - multi-layer comments also apply here.
-- Richard Rabbat - supports the work, suggests looking at odd numbers
rather than even.
-- Ping Pan - how does this differ from the overlay model?
-- Kireeti - different, take this to the list.
15. L1 VPN - Tomonori Takeda (10 Min)
<http://www.ietf.org/internet-drafts/draft-takeda-l1vpn-framework-02.txt>
<http://www.ietf.org/internet-drafts/draft-takeda-l1vpn-applicability-01.txt
<http://www.ietf.org/internet-drafts/draft-ouldbrahim-ppvpn-gvpn-bgpgmpls-05
.txt>
<http://www.ietf.org/internet-drafts/draft-ietf-ccamp-gmpls-overlay-05.txt>
-- Mailing list - www1.ietf.org/mailman/listinfo/l1vpn
-- Two drafts applicable, ouldbrahim and overlay - guidelines for
enhancement, deployment scenaros - added terminology refinement, security
considerations, service models
-- Further comments solicited, planning further liaison to SG13.
-- Applicability draft examines existing GMPLS protocols for L1 VPN
services. Has added Deborah as co-author.
-- Concept - set up FA LSP between PEs, use stitching to connect this to
CEs.
-- Propose to adopt as CCAMP charter item.
-- Kireeti - supports applicability draft. Liaison with ITU is very
important - we need to be responsive. We will discuss this item as part of
the extension of the CCAMP charter
16. Signaling for L2 LSPs - Dimitri Papadimitriou (10 minutes)
<http://www.ietf.org/internet-drafts/draft-papadimitriou-ccamp-gmpls-l2sc-ls
p-03.txt>
-- ATM, FR, ETH, etc. Defines label request processing, label semantics,
added security section.
-- Security - threats analysis, attacks on the data plane, L2 LSP
signaling,
attacks on control plane
-- Ask for WG draft, no plan to respin
-- Dave Allan - Question on Ethernet VLAN tag swapping - not defined in
IEEE.
-- Dimitri- intended to cover GMPLS scope, not data plane. Should not
assume tag is per port unique.
-- Don Fedyk - is this P2P?
-- Dimitri - Yes (as starting point).
-- Kireeti - ok, we have a fair consensus, so I would say it's a rough
consensus point. We will take this to the list, Dave and Dimitri to work
out
VLAN issue.
-- Note that an MPLS group draft on L2 has come up
17. Mesh Carrier Survey - Richard Rabbat (5 min)
<http://www.ietf.org/internet-drafts/draft-rabbat-ccamp-carrier-survey-01.tx
t>
-- Initially 7 carriers polled, open to others
-- Also surveys GMPLS control plane deployment
-- 1 has deployed, 3 within 2-3 years, 3 with no current plans
-- Concerns with stability, signaling storms
-- Asking for feedback, new carrier input
-- Richard - review slides, recommend for CCAMP WG to begin work on shared
mesh restoration performance
18. Milestone and Charter discussion - Kireeti
-- Current activities winding down, esp. P&R, ASON
-- Others underway, esp. multi-domain
-- New: migration, VPNs, control plane resilience, addressing,
implementation experience, GTTP (?)
-- Migration
- GMPLS supersets MPLS, but some objects are different - label request,
label, upstream label
- Need BCP on smooth migration, what issues may occur
-- L1 VPN
- Should IETF do this? Should it be in CCAMP? Tied to UNI and Interdomain
signaling
-- Control plane resilience - includes graceful restart but also more
-- Addressing - transport networks use different kinds of addresses - need
decoder ring for mapping transport network address types to IP addresses -
Kireeti considers this useful
-- Interop results - note that addressing pops up there as well. BCPs
would
be helpful.
-- Send out request for new work items, replies due Friday 11/19.
-- Send out checks for consensus on each item, replies due Friday 12/3
-- Send resulting list to A-Ds, trimmed if necessary, add appropriate
milestones
-- Consensus is a requirement but not a guarantee.
-- Lou - how about dropping something from the existing charter -
-- Kireeti - maybe GTTP - Lou - should note on the list also things that
may
be dropped if no support.
-- Alex - about L1 VPNs - is this research work, or practical? Need at
least one implementation - is anyone implementing this within a year or
two?
-- Dimitri - Solutions exist provided by vendors today, but no common
framework. Timeframe for implementation is 18-24 months.
-- Alex reminds the group of the need for running code.
-- Adrian - what about informational draft on how to use existing functions
to do the service? Is there any interest from the research groups or the
real carrier deployment groups?
-- Tomonori Takeda - NTT has interest, but not sure of protocols.
Timeframe
- cannot say. Testing is done.
-- Yakov Rekhter- vendors cannot disclose future product plans...
-- Deborah Brungard - carriers also cannot disclose plans, will see
interest
by number of co-authors.
-- Kireeti - have had carriers ask for this technology. We don't have all
the pieces, but have implemented many of them, and as a vendor would
like to
see a solution on how to do. Answer to Alex is yes.
-- Richard Rabbat - could add this to his survey.
-- Kireeti supports this.
MEETING IS ADJOURNED.
.