WG Review: Transparent Interconnection of Lots of Links (trill)

The IESG <iesg-secretary@ietf.org> Wed, 15 June 2005 18:52 UTC

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From: The IESG <iesg-secretary@ietf.org>
To: IETF-Announce@ietf.org
Date: Wed, 15 Jun 2005 14:52:27 -0400
Cc: rbridge@postel.org
Subject: WG Review: Transparent Interconnection of Lots of Links (trill)
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A new IETF working group has been proposed in the Internet Area. The IESG has 
not made any determination as yet. The following draft charter was submitted, 
and is provided for informational purposes only. Please send your comments to 
the IESG mailing list (iesg@ietf.org) by June 22nd.


Transparent Interconnection of Lots of Links (trill) 

Current Status: Proposed Working Group


Internet Area Director(s):
Mark Townsley <townsley@cisco.com>
Margaret Wasserman <margaret@thingmagic.com>

Internet Area Advisor:
Mark Townsley <townsley@cisco.com>

Technical Advisor:
Bill Fenner <fenner@research.att.com>


Mailing Lists:
General Discussion: rbridge@postel.org
To Subscribe: http://www.postel.org/mailman/listinfo/rbridge
Archive: http://www.postel.org/pipermail/rbridge

Description of Working Group:

The TRILL WG will design a solution for shortest-path frame routing in
multi-hop IEEE 802.1 Ethernet networks with arbitrary topologies,
using the link-state routing protocol technology.

This work will initially be based on draft-perlman-rbridge-03.txt.

The design should have the following properties:

- Minimal or no configuration required
- Load-splitting among multiple paths
- Routing loop mitigation (possibly through a TTL field)
- Support of multiple points of attachment
- Support for broadcast and multicast
- No significant service delay after attachment
- No less secure than existing bridged solutions

Any changes introduced to the Ethernet service model should be
analyzed and clearly documented. To ensure compatibility with IEEE
VLANs and the Ethernet service model, the WG will request an IEEE
liaison relationship with IEEE 802.1.

It is not an explicit requirement that the solution should be able to
run on existing IP routers or IEEE 802 switches as a software upgrade.
However, the working group should take deployment considerations into
account, to ensure that the solution can interwork with bridges in a
flexible manner (e.g., to allow incremental deployment into LANs that
currently use 802.1D bridges).

The TRILL working will work with the L2VPN WG and IEEE 802.1 to
develop interworking between TRILL and 802.1D bridges at the edge, such
that a bridged sub-cloud could be attached to TRILL devices in more than
one place for redundancy.

The solution must not interfere with the end-to-end transparency of
the Internet architecture or with end-to-end congestion control and
QOS mechanisms.

The WG will work on the following items:

(1) Develop a problem statement and architecture document that
describes the high-level TRILL architecture, discusses the
scalability of that architecture, describe the threat model
and security impacts of the TRILL solution, and describes the
expected impacts (if any) of the TRILL solution on the Ethernet
service model.

(2) Define the requirements for a TRILL-capable routing protocol, and
select one or more existing routing protocols that could meet
those requirements.

(3) Work with the appropriate Routing area working group to extend an
existing routing protocol to meet the TRILL working group

Note: The TRILL working group is not chartered to develop a new
routing protocol or to make substantial modifications to an
existing routing protocol. If, during the requirements definition
and selection phase, the TRILL working group discovers that no
existing routing protocol will meet their needs, we will need to
re-assess the TRILL WG charter to determine how/if this work
should proceed.

(4) Produce a (set of) TRILL specification(s) for standards track
publication that defines what information must be carried in an
encapsulation header for data packets, and determine how to map
that information to various link types (only IEEE 802 links

The TRILL working group is chartered to undertake all of the above
tasks and may begin work on more than one of these tasks in parallel.
However, the problem statement and architecture document should be
completed before the details of the base protocol are finalized, while
there is still time to consider changes to the architecture without
major impacts on established specifications.

Goals and Milestones:

Aug 05 Accept Problem statement and architecture document as a WG
work item
Aug 05 Accept base protocol specification as a WG document
Oct 05 Accept routing protocol requirements as a WG work item
Dec 05 Submit problem statement and architecture document to the IESG
for publication as an Informational RFC
Mar 06 Submit routing protocol requirements to the IESG for
publication as an Informational RFC
Mar 06 Choose routing protocol(s) that can meet the requirements.
Apr 06 Start work with routing area WG(s) to undertake TRILL extensions.
Sep 06 Base protocol specification submitted to the IESG for
publication as a Proposed Standard RFC
Dec 06 Re-charter or shut down the WG

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