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- CURRENT_MEETING_REPORT_
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-
- Reported by Andy Nicholson/Cray Research, Inc.
-
- CBNR BOF Minutes
-
- Description:
-
- We held a BOF on this subject at the 20th IETF in St. Louis, and this
- is a continuation of that interchange. However, the only attendees from
- the St. Louis meeting present at this meeting were the Cray Research,
- Inc. representatives.
-
- While working with circuit-switched T3 networks, developers at Cray
- Research, Inc., determined that there would be advantages to defining a
- standard way to control certain classes of network resources through the
- internet. In the case of a circuit-switched T3 line, the line should be
- switched on only when there are active transport connections which can
- fully utilize the service. Due to the high cost of the resource,
- under-utilization would be particularly undesirable. The developers
- believe that this capability might have other applications in the
- internet and that an effort should be made to define a standard
- protocol.
-
- Minutes:
-
- Due to the small size and informality of the meeting, no formal Minutes
- were taken. This record is believed to be reasonably accurate and
- proper credit given to the originators of the ideas and concepts
- presented. Andy Nicholson, who is preparing this report, apologizes for
- any errors or omissions.
-
- A variety of new issues were brought up at this meeting, and it was
- encouraging to note that there were as many non-Cray people as Cray
- employees. Most of the discussion centered around the concrete example
- of the Circuit-Switched T3 services being prototyped by Cray Research,
- Inc.
-
- The first issue raised centered on local routing to the T3 adapter.
- This would include routing to any controlled device. The prototypes
- assume that a particular network link will be used for transfer of data
- packets, thus static routing is implied. There is concern that this
- perspective may lead to the use of static routing between the requesting
- host and the controlled resource. There was general agreement that this
- should not happen.
-
- Another issue concerned recursive conditioning of resources. A host in
- control of a link might need to pass a request to another host through
- the controlled link so that further downstream links may be conditioned.
- This should be possible.
-
- Fred noted that some comparisons could be made with regard to this
- capability. For example, this is similar to the switching which takes
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- place through the telco fabric as calls are routed. There is also a
- similarity to X.25. For example, TP0 will create a link over x.25 when
- a connection is established.
-
- Matt did not think that this could be a widely deployed function;
- however, Fred noted that this might be useful in any kind of
- fundamentally switched service, i.e. ISDN or mobile hosts. This seems
- like something that is in the future.
-
- In the Cray Research, Inc. prototype, most of the support code is in
- the kernel. Matt and Fred were concerned that perhaps this should all
- reside in user space. This leads to two fundamentally different
- approaches. For everything to be in user space, either special commands
- must be executed to condition the network before running applications,
- or the applications must make special library calls. If everything is
- in the kernel, then these services can be transparent to users and
- applications.
-
- These discussions led us to a very different conclusion from the last
- meeting. All agreed that I would finish an informational RFC relating
- our experiences with the switched T3 services in time for review by the
- community before the next IETF. If possible, I will also document the
- protocol we are using.
-
- At the 22nd IETF we will once again hold a BOF to gauge interest in
- these facilities. At that meeting we will determine whether to continue
- any work through the IETF.
-
- Attendees
-
- Fred Baker fbaker@emerald.acc.com
- David Borman dab@cray.com
- Matt Mathis mathis@psc.edu
- Andy Nicholson droid@cray.com
- John Seligson johns@ultra.com
- Jeff Young jsy@cray.com
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