Stewart Bryant, IETF Routing Area Director, <email@example.com>
Adrian Farrel, IETF Routing Area Director, <firstname.lastname@example.org>
IETF Liaison Archive, <email@example.com>
Purpose: For Information
Title: Proposed IETF BFD WG Work on Ethernet LAG
We would like to draw your attention to a topic that has been raised in the
IETF's Bidirectional Forwarding Detection (BFD) working group.
Operators and vendors are considering how to load-balance IP over the members
of an Ethernet LAG that is presented as a single IP interface. As part of
this, there is a suggestion to run IP/UDP-encapsulated BFD over each of the
group members and to use the Ethernet LAG identifiers as identifiers in the
BFD message exchanges.
This is not currently working group work, and it falls outside the current
scopeof the BFD working group's charter
(http://datatracker.ietf.org/wg/bfd/charter/). However, we anticipate that
there will be discussion of the topic at the IETF's meeting in Paris during
the week of 25th March 2012.
The starting point for the discussion in Paris is likely to be an
Internet-Draft that can be found at
http://datatracker.ietf.org/doc/draft-mmm-bfd-on-lags. We must emphasize that
this is an Individual I-D that does not represent the consensus view of the
working group and is not even a working item of the working group.
Additionally, it is a first version of the draft and might need considerable
At this stage we would welcome your preliminary views on the topic, and (of
course) welcome participation at the meeting in Paris or on the BFD working
group's mailing list that can be accessed from the charter page (above). We
are particularly interested to understand what parameters and constraints we
need to set on this work within the IETF such that we can deliver the required
technical functionality without overlapping
the technical work that the IEEE considers its own purview.
We will send you a further liaison after the Paris meeting to keep you
informed of progress and to let you know our plans.
Stewart Bryant and Adrian Farrel,
IETF Routing Area Directors