2005
Message-Id: <MON.28.MAR.2005.112619.0500.>
Date: Mon, 28 Mar 2005 11:26:19 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Element Properties
Mime-Version: 1.0
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As suggested on the list before the meeting, and discussed at the meeting,
I think it may make sense to provide explicit mechanisms in the model and
protocol for referencing the properties of any element of any LFB.

The basic approach would be to include in the core library a data
definition for the scalar for access (none, read-only, write-only, and
read-write is what I would start with.)
Then, we would define a structure to be returned for a properties reference
to any element in the model.  A property reference would be indicated by
setting a bit in the path flags that reference the element.

At the moment, I can see two structure definitions.  One for most elements
which only contains the access permissions, and one for arrays which
contains other array properties.  I have included the XML declarations for
all of this at the end of this message.

There are a number of open questions:

1) What should we use for the properties of a structure?  We could just
return the permissions, which would relate to the structure as a whole.  We
could try to return a complex structure with the permissions for the struct
and the permissions for every element within the structure.  I am inclined
to keep this simple, but the result is that if one needs the element
properties one has to GET a number of pieces of information.

2) What should we use for the properties of an LFB?  (This would be
reference by a path with the properties flag set and 0 identifiers in the
path ids.)  Should it reference just the LFB?  Should it try to return the
properties for every top level element in the LFB?

3) What about Aliases?  All the other properties are read only.  It is very
tempting to put the Alias target information into the alias properties
structure (much as the array information is in the array properties
structure.)  The one aspect that gives me pause in doing that is that we
would have to allow SET operations against Alias properties to make this
work.  Is that a good idea?

4) As a minor aspect, if we have nested path-data TLVs how should the
property flag be set and interpreted?  My inclination is to say that the
flag only applies to paths which do not have nested path-data.

For completeness, the XML:

<dataTypeDefs>
   <dataTypeDef>
     <name> elementAccessScalar </name>
     <synopsis> scalar of access permission values </synopsis>
     <atomic>
       <baseType> uchar </baseType>
       <specialValues>
         <specialValue value="0">
           <name> no-access </name>
           <synopsis> no access is permitted </synopsis>
         </specialValue>
         <specialValue value="2">
           <name> read-only </name>
           <synopsis> read access is permitted </synopsis>
         </specialValue>
         <specialValue value="2">
           <name> write-only </name>
           <synopsis> write access is permitted </synopsis>
         </specialValue>
         <specialValue value="3">
           <name> read-write </name>
           <synopsis> read and write access is permitted </synopsis>
         </specialValue>
       </specialValues>
     </atomic>
   </dataTypeDef>

   <dataTypeDef>
     <name> BasicElementProperties </name>
     <synopsis> the structure for most element properties </name>
     <struct>
       <element>
         <elementID> 1 </elementID>
         <name> access-permissions </name>
         <synopsis> what access is permitted to the referenced element
</synopsis>
         <typeRef> elementAccessScalar </typeRef>
       </element>
     </struct>
   </dataTypeDef>

   <dataTypeDef>
     <name> ArrayElementProperties </name>
     <synopsis> the additional properties for an array element </name>
     <struct>
       <derived-from> BasicElementProperties </dervice-from>
       <element>
         <elementID> 2 </elementID>
         <name> first-used-index </name>
         <synopsis> index of the first used array element </synposis>
         <typeRef> uint32 </typeRef>
       </element>
       <element>
         <elementID> 3 </elementID>
         <name> first-unused-index </name>
         <synopsis> index of the first available array element </synposis>
         <typeRef> uint32 </typeRef>
       </element>
       <element>
         <elementID> 4 </elementID>
         <name> last-used-index </name>
         <synopsis> index of the last used array element </synposis>
         <typeRef> uint32 </typeRef>
       </element>
        <element>
         <elementID> 5 </elementID>
         <name> used-entry-count </name>
         <synopsis> number of entries used in the array element </synposis>
         <typeRef> uint32 </typeRef>
       </element>
    </struct>
   </dataTypeDef>

Yours,
Joel M. Halpern

PS: I have moved derived-from and element-ID to nested elements instead of
attributes because that seems the most consistent with the advice I could
get from the application folks.  I still should talk to Scott Hollenbeck to
really understand this.





2005
Message-Id: <FRI.25.MAR.2005.055113.0500.>
Date: Fri, 25 Mar 2005 05:51:13 -0500
From: Abid Ghufran <aghufran@HAMDARD.NET.PK>
Subject: generic network and element models

I am assisting someone do a thesis. For that it is required to have a
"generic network model", over which to simulate various transport
mechanisms. My queries are with this perspective.

My questions are with reference to the "products" of this working group,
particularly those stated as follows:

  "A set of requirements for mechanisms to logically separate the control
and data forwarding planes of an IP network element (NE)."

  "An architectural framework defining the entities comprising a ForCES
network element and identifying the interactions between them."

 "A description of the functional model of a Forwarding Element."


To me this imply that during the course of work, there will be a generic
functional model of some sort, that will be used as a functional forwarding
element.

If this were the case then my questions would be:

1) Is it possible to build a generic network model (from simulation and
analysis point of view), solely comprising of ForCES network elements?

2) While developing an architectural framework, defining the entities
comprising a ForCES network element, was a model of a "generic network
element" utilized?

3) How do you plan to carry out the study, of incorporating or embedding,
the ForCES network element (comprising of whatever aspects), into the
existing networks, comprising of non-ForCES framework(s)?

I realize that these queries might be a bit vauge with respect to their
significance. Still I would request your assistance and shall be very
grateful if somehow I am able to have an insight into these issues.

Regards,

Abid Ghufran.


2005
Message-Id: <WED.23.MAR.2005.115746.0800.>
Date: Wed, 23 Mar 2005 11:57:46 -0800
From: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
Subject: Re: ForCES Minutes, IETF 62 Minneapolis, USA
Comments: To: Patrick Droz <dro@zurich.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Thanks Patrick for the very detailed notes!
=20
regards
Hormuzd

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Patrick Droz
Sent: Wednesday, March 23, 2005 12:43 AM
To: FORCES@PEACH.EASE.LSOFT.COM
Subject: [FORCES] ForCES Minutes, IETF 62 Minneapolis, USA

Minutes ForCES WG at the IETF62 in Minneapolis St. Paul, USA
------------------------------------------------------------

Agenda, IETF 62

Monday, March 7, 2005, 9:00-11:30
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D

CHAIRS:   David Putzolu <David.Putzolu@intel.com>
           Patrick Droz <dro@zurich.ibm.com>

ADs:      Alex Zinin <zinin@psg.com>
           Bill Fenner <fenner@research.att.com>

AGENDA:

10 min - WG status & Agenda Bash - chairs

10 min   ForCES Intra-NE Topology Discovery
            Furquan Ansari
            draft-ansari-forces-discovery-01.txt

15 min - ForCES Forwarding Element Model
            Joel Halpern
            draft-ietf-forces-model-04.txt

30 min - TCP/IP based TML (Transport Mapping Layer) for ForCES protocol
            Shuchi Chawla
            draft-khosravi-forces-tcptml-01.txt

30 min - ForCES Protocol Draft Status & Changes
            Avri Doria or Jamal Salim
            draft-forces-protocol-02.txt

Minutes
-------

Attendees: 35

Unfortunately there was no volunteer to take minutes therefore,
I recorded the meeting.

The chairs began the meeting by reviewing the agenda and then going
over the status of the group. It was stated the the protocol was
expected to go through 1 or 2 more drafts before going to WG Last
Call.

----------

Presentation 1: Furquan Ansari
draft-ansari-forces-discovery-01.txt

We then went into a discussion on the first agenda item on FE topology
discovery. A first version of the draft had been presented in the last
IETF meeting but at that time not many people had read the document. In
the meantime quite some animated discussions took place on the mailing
list. And the list came to the consensus that the draft does make sense
and that is useful to have. There was no presentation of the draft. Main
topic was to decide whether we should adopt the draft as a WG draft.

Furquant repeats that the draft has been discussed on the list and that
it seems we have reached consensus on making it a WG draft.

Chair: proposes to make the draft a WG draft but wants to follow up
first with the ADs.

Q Avri: I am not against the draft but why do you have to check with the
ADs first?

A chair: Because the charter is too vague on that. It does not prevent
us from doing but also does not say we must do it.

After checking with the ADs the draft is now a WG document.

----------

Presentation 2 Joel Halpern
draft-ietf-forces-model-04.txt

There has been made significant progress on the model and the protocol
draft and especially to line them up with each other. He presents the
changes that have been made since the last version. Also the open issues
      were presented.

Changes in brief: in the previous draft there was a thing that described
the FE this was done by a separate schema and then the protocol team
asked to make this an LFB. So the model has been changed that the FE
information is now in an LFB class. There is now an ID for the class and
an ID for the instance. But there is only one instance. So this is now
much cleaner. There were several request to have the ability to address
tables and arrays by value. So there are now methods put in place to say
that this table can be referenced by value. People also wanted to have
methods to share information among multiple LFBs, this is now achieved
by introducing the alias mechanism. The model also turned out to have
some missing type definitions so one was added but a second one might be
needed as well.

Changes in more depth:
    - FE schema changed into an LFB class definition using the same
schema
that all LFB classes are using. This is now the only LFB class that is
defined in the model document. The LFB class definition go now into a
library document. This class is assigned class ID 1 and instance ID 1.
It is important to note that it is always 1 since it is the
bootstrapping of the protocol. It captures all the information that was
in the FE schema. When the CE comes up it gets connection to the FE then
it says give me LFB class ID 1, instance ID 1. Give me the whole thing.
However, this is not mandatory. But this is the typical scenario.
Assigning the instance ID like this is a bit unusual. Certainly more
information need to ge into the LFB class, more capabilities and
attributes are needed. The list is asked to come up with the missing
pieces. Probably there will be a similar LFB class to represent the
interaction with the ForCES protocol with the FE. That will probably be
included in the protocol document because it has protocol relevant
information rather then model relevant information.
    - Element identifiers - The protocol now references information
through class ID, instance IF of an LFB and a sequence of attribute or
element identifiers with array subscripts. So those numbers need to be
defined. Each one is defined within a given scope. Within a given LFB
class they have to be unique. But they do not have to be unique across
classes. But it is much cleaner and simpler than what we had to do in
SNMP. However there is an interesting point. The way the protocol and
the model is structured we assume the LFB class ID are globally unique.
How to make that work? Global uniqueness is always an interesting
problem. Should we keep a global list of all the class IDs? We need to
do something to make them easily globally unique. At the moment we do
not know how to do it. LFB class, attributes, capabilities, and
structure element have an ID. There is an ongoing stylistic debate on
what belongs into attributes or nested tags. Many WGs that are using XML
are having this debate when to use tags and when to use attributes. So
we thought using attributes was an appropriate thing to do. If somebody
has an issue with this please speak up now or raise it on the list.
    - Content keying - There was a major request for the ability to
reference arrays and table elements by their content instead of just by
their subscript. So we are supporting this. Get and set operations are
supported. There was a big debate on the list what the scope of this
should be. Joel thinks there was WG consensus but he knows what he has
written on the foils. Key 'ContentKey' is only for predeclard keys and
they must be unique within their tables. There is an example given in
the presentation. You can declare to have multiple key fields and that
declares that the combination of multiple key fields in a single key.
That means the combination of the fields is the key and the combination
must have a unique value on every entry in the array. You can also have
multiple key declarations that declare each of these keys is unique in
every entry of the array and you can use anyone for reference. That is
the current compromise on content keying. How to call this keys is not
completely settled yet. There was also some XML violations that had to
be fixed. According to the XML folks introducing a container would solve
the problem. This is almost an editorial change. It does not affect the
protocol at all.
    - Alias -  There are situation and this can be debated for ever
where
LFBs need to share information e.g. ARP LFB sharing MAC addresses. So a
way is needed to describe sharing. There are multiple ways to achieve
this e.g. an LFB owns the information and the other LFBs can point to
it. That approach is being taken. This is basically a pointer. Now what
are the properties of such pointers. The pointer needs to contain what
class of LFB it points to, what instance of the LFB you are pointing to,
what attribute within the LFB you are pointing to, and something that
you can use to get the data. So you can declare within a LFB class
definition or structure that something is an alias. An alias is used to
point to something else. An alias has a type. All the way the protocol
works everything is strictly typed. Therefore, the alias has to have a
type. So per alias we need to have four related pieces of information.
We wanted to have things simple. You create an alias, then give it a
type and under the cover create a structure that can take all four
pieces. They can be chained. The concept lets you easily reference
information at other places.

Q: if you make an alias and it points somewhere and then you remove that
element. What happens to the alias?
A: We do not want to require automatic cleanup. This is an important
question and we have to solve this. In other cases you may also point to
something that does not exist. So we would probably require that you get
back Nil / Null as a result. We need to define this and what the
behavior of dangling pointers is.

    - Open Issues -
The list of the 5 open issues is:
o Configured Adjacency Description -
o Element Meta Information
o Events
o Optional Elements
o Unlimited length strings

In more detail:
- Configured Adjacency Description - The FE object has in it a set of
information about configured FE neighbors. This is what the WG decided.
This includes information of the MAC and IP address of the neighbor.
This seems to be the natural way of configuring neighbors. Jamal raised
an interesting alternative. This kind of configured neighbors is really
used by the CE that has multiple things that it controls who are
neighbors to each others. A better way to discover this is the ansari
draft on FE topology discovery but there was a request to have the
configuration capability. So what when you just configured the neighbor
FE ID and the port that he reaches you. This will tell you how to send a
messages to the guy because this is enough information. So we basically
have to methods of identifying neighbors. What is important is that we
have to pick one method. It is important to note that this is for
configured neighbors and not for real discovery.
Q. What happens if you use both methods could you get a conflict.
A: Yes, if you configure both you could indeed get a conflict. You could
mix up some of the values. So you do not want to use both. We have to
pick one or the other. That is why I brought it up.

- Element Meta Information - We have LFB elements, structure elements,
in the model and referenced by the protocol. These elements have
properties. The simplest property is, does it exist, is it readable, is
it writeabel. It may have other properties. We have foreseen for LFB
level capabilities that are described in the model. And if you look at
the FE object LFB it has a capability section. So this was captured but
only at the LFB level. If you have an FE with a structure of option
elements, how do you know whether they are supported. If you have a
structure that is readable or read / writeabel how do you know what
information there is. Just try it? Maybe we need to find a consistent
way of talking about properties of elements. When you think about
arrays, arrays have an additional set of properties. How many elements
do you have currently, what is the highest subscript currently being
used, maybe what is the first hole that might be useful for reusing the
space. So arrays have more complicated properties. When you look at the
aliases I was showing you earlier, you can easily talk about pointers
that have properties of the actual pointer element. It makes the alias
cleaner if you can talk separately about the properties and its values.
Then the value would always be the pointer and the properties would be
the LFB attributes. So it seems that if we could talk about the
properties of any given piece of information in the LFB structures would
be a useful generalization. And we could use the class that we put into
the data path in the protocol to indicate that we are talk about the
property instead of the data. But this implies that we are talking about
how do we define what the property information is for each object we can
have. We can define those as structures themselves. So there are
structures for the array properties and so force. That would allow us to
consistently talk about them. Joel thinks that we should add this
feature. But it is a major increase in complexity. That is why he is
reluctant in doing it. Joel asked the floor for comments. There are just
some nodding heads but no comments. Joel will post additional
information on the subject to the list.

- Events - Thins can happen at the FE that the CE needs to know of.
These are things that need to observed now and not a certain period
afterwards. So we need to have a mechanism for the FE to send up reports
or notifications to the CE called events. A different thing would be
from the CE to the FE. We have to define a number of things about the
events. For each LFB we have to somehow say what events can each LFB
generate and we have to create some mechanism for the FE to say I want
this event. But as the number of events is probably going to be large we
do not want to mandate that each FE shall consider all events and each
CE will be perceived by each event. So depending what the elements are
doing they may not be interested in all the events. It might be
reasonable to be able to subscribe to events. So we need a way to
subscribe to events. We also have to create IDs for the events. I
identified two ways of defining the events but there are probably more.
One way of doing it is for each structure definition, for each array
definition you could include in it the event definition with the
structure definition and then create the appropriate identifiers with
boolean pieces for the sign-up. At the LFB level you would have another
event declaration for the LFB level of events. This gives some
simplicity to it but that is also its draw back. It means that when I
have the same structure used in multiple places one needs to know at
creation already who is interested in what. So this method is probably
not feasible. The other alternative is to have in the LFB definition an
event section in which you define all the events of interest for that
LFB. But that means you have to reference all the top level things and
any structures that are buried in arrays. So the whole thing ends up
with a much more complex naming problem. Though it is much more powerful
    and more verbose. Which one to pick is currently not known. That is
why I brought it up for discussion. But it is clear we need to have the
events defined somehow.

Q: Is correlation of events and root cause analysis within scope?
A: What I believe is within scope is we have to define what is supported
    in the events whatever method we are going to use. I don't think
that
correlation and root cause analysis is our problem but we should have
enough information such that is useful for the CE to find out what heck
to do with this. If for example an Ethernet switch is failing that is
certainly not a ForCES problem. It is however an important problem.

Q: Can I turn on and off all events or can I turn on and off some
events for a certain table?
A: We probably have to allow some of these things but I hope we will not
go overboard with this! This can become very complicated especially for
the FE. I hope we can keep this simple to implement. Scope sign-up's on
tables has not been put in yet but Jamal really would like to have it.
For example I would like to have a status update for every port up or
down on a certain table. And you do not need to sign up for every new
port for that particular event. Side comment, event history is not the
FE's job. This is definitely the CE's job.

Q: Are events reliable.
A: The ForCES protocol is reliable and so are the events. They run over
TML and this is for example TCP which is reliable.

There are 2 more changes to the model. One went in the other did not.
The model had text strings that had a fixed length. This was always
fixed. There were multiple places while I was doing the LFB FE object
where I needed a binary string which was up to a certain length but was
not always that length. So I added a type for that one. Strings are
defined as variable length but they have a length limit. In some places
we needed unlimited length. In some cases it was unclear whether we
needed a length or not and if yes how long it should be. And I think it
is not the model's job to say it must be length so and so. So we
probably need an unlimited length string in the model. And a property of
such a string would be how long it is.

Q: But unlimited length strings do have security problems.
A: No the security problem comes from buffer overflow. But in our case
the CE or FE has to make sure the the unlimited length string is not
going to exceed the size of the buffer. The security problem comes only
if you do a bad job of implementing this. We can define a max length and
maybe we should but I could not come up with a length limit that made
any sense. So folks may look at the FE LFB definition and see if they
can come up with a reasonable length limit for every place I had to put
in a length limit. Or we can go with an unlimited length string.

What was also added are derived classes to the model. How to implement
this is part of the XML debate.


Presentation 2: Shuchi Chawla
draft-khosravi-forces-tcptml-01.txt

I will go through the revisions that have been made to the draft since
the last meeting. I will start with a brief overview of the TCP/IP based
TML. Due to the ForCES requirements of reliability and flow control we
have picked TCP. By picking TCP the TML does not have to do any
additional things to meet those 2 requirements. Then ForCES also
requires that security should be addressed so we propose to use TLS for
security. As in the ForCES protocol the CE is the master and the FE is
the slave, the CE would be setup as the TLS server and the FE as the TLS
client. The TML draft allows for unicast, multicast and broadcast
addressing. Unicast is supported by using standard TCP/IP channels and
multicast would be simulated through multiple channels. Some more
details will follow later. The TML draft supports prioritization in TML
messages and it also prioritizes control messages over data messages. by
using different data and control channels. At the moment the TML draft
proposes a TML header to do encapsulation. This is currently under
discussion. The reason for it was to have additional signaling messages
for multicast support. So the goal is to investigate how to make things
as lean as possible. The support of high availability (HA) has not been
detailed yet what we have specified yet is that if the PL heart beat
does not continue we would use the TML heart beat. There are methods in
place to do fast switch over between the active and a standby FE or CE.
DoS attacks are mitigated by the separation of control and data
channels. When the data channels gets flooded with malicious traffic the
control channel still remains operational. In addition, the control
messages are prioritized over data packets.

It is only recommended to use two TCP connections between the CE and FE,
one for control the other for data. In case of a standby CE we would
have additional 2 TCP channels between the backup CE and the FE. In
terms of functions the CE is considered to be the server and the FE the
clients. So the CE is the one that is listing on predefined ports and
the FEs are going to connect to them. Channel shut down can be initiated
by both sides. There is a diagram in the slides that shows how the setup
/ tear down looks.

Q: Question on how the exact hand over between a failed active CE and a
backup CE would work. - lengthy discussion including what the hardware
can do or not -
Editors comment and summarization: There was mainly some confusion what
the exact definition of a backup CE is. Everything seemed to be clear by
assuming that the backup CE just listens to everything and maintains all
the states from the active CE without actively sending out messages.
That is one of the HA Models.  However, various HA models are possible
where the backup CE may not be completely passive or there might be load
sharing etc.  The final conclusion (with Joel adding the final comment)
was that the TML draft should not specify the HA Model or what can /
cannot occur over the channels to the backup CE(s). It is outside the
scope of TML.  All that the TML draft should specify is that control and
data channels must be established between the CE and FE, and in case of
a switchover from the active to the standby CE, the FE should be able to
communicate to the standby CE (or in other words, the new active) using
the TCP TML channels.

Unicast and multicast is supported over unicast links. The multicast is
simulated over multiple unicast channels. This required the introduction
of additional TML messages that are used for join and leave operation on
multicast connections. The message are then replicated according to the
FEs that are part of a certain multicast group. It is kind of the
traditional multicast with the root at the CE and the leaves at the FEs.
    So it is assumed that the FE is configured with multicast group
information.

Q: why do you do that. This model already has been significantly
modified in the SSM (Source Specific Multicast) model. In the ForCES
case it is sender driven, the sender knows what to send where. An FE
never knows what a particular CE wants to achieve. The sender knows
exactly what to send to whom. Avri is not so sure about that. Joel is
the opinion that we get a much simpler behavior if we do not try to
mimic multicast.
A: We were investigating 2 multicast models -- one which is FE
initiated/configured mimicking traditional multicast, and one which is
CE configured.  We picked the one which is FE initiated under the
assumption that since it mimics traditional multicast we wouldn't be
reinventing the multicast model.  But if the ForCES use of multicast is
expected to be slightly different from what occurs in traditional
multicast, we will revisit this.

The proposed multicast schema is currently under investigation to find
out whether it can me made leaner and simpler. The CE could for example
tell to the FE in which multicast group they are which means we do not
have to mimic join and leave messages. Another thing is that the same
channel is used for unicast and multicast. The group / channel
descriptor is going to distinguish if a message has to be sent to a
single FE or needs to be replicated for a multicast group including
multiple FEs.

The TML supports to carry PL control and data messages and if we cannot
do away with TML control messages also the TML control messages. In case
we have TML control messages then there would be a TML shim header in
order to support these messages. TML and PL control messages would be
exchanged on the same control channel. The exact definition of the
header can be found in the slides and the draft. A simplification of the
header would be very welcome. The draft contains also an interface to
the PL in the form of an API as a guideline of what functionality the
TML can provide to the PL layer.

Q: (Joel) a guideline is probably not sufficient. We need to mandate
exactly what the TML can provide to the PL. We also should not provide
this in the form of an API but rather in terms of a service interface.
This service interface should be generic to all TML. He does not care
whether the spec goes into one of the TML drafts or in the PL draft.
A: I agree. We started off with an API definition. We just needed to
start somewhere but we know we will have to evolve this into the exact
service interface that the TML will provide. This service interface
could also go into a separate draft.

Then the functionality of the current API proposal is presented (see the
foils). The services are:
    - tmlInit
    - tmlOpen
    - tmlClose
    - tmlWrite
    - tmlRead
    - tmlMulticastGroupJoin
    - tmlMulticastGroupLeave
In the current model tmlOpen and the last 2 are FE initiated.

Then the setup procedure is shown (see foils). Then the same thing is
shown for multicast support (see foils). The presentation is given
according to the currently proposed multicast model. If the multicast
model would be changed into a more CE driven model then the join and
leave messages would not be necessary anymore.

    - Open Issues - Broadcast has not been addressed so far. HA needs to
be  spelled out in much more detail. Message prioritization also needs
further details. Finally message encapsulation and multicast model needs
additional work. Shuchi concludes with a summary of the presentation.

Finally Shuchi asks to make this draft a WG document. The chair asked
the floor if there are any objections to make this draft a WG document.
There was no opposition. The chairs and ADs had discussed this before
and  there was also no objections. Therefore, the draft became a WG
document. But the chair raised again some points:
- data channel using TCP from the TML even if it is a raw or UDP
connection. Probably many routing protocol people will not at all like
this as they are taking care themselves of flow control and retransmit.
Also RDMA support should be thought of.
A; we are considering tunneling like GRE or DCCP to address the issue.

Comment from Joel: yes this should be a working group document but that
does not mean we take the draft as is. Joel is also the opinion that
DCCP might be a good alternative for the data channel. Take this draft
as good start and progress on it.

Chair comment: the service interface should either be a separate draft
or part of the PL. Important is that the service interface is generic to
the underlying TML as we want to have the option of swapping TMLs.

Q Avri: by making this a WG draft does it mean we are considering the
work on service interface and TML as WG issues. Can we split thing apart
later or not?
A chair: we basically have agreed on the list already that we need a
generic service interface usable for multiple TMLs. We also need a TML
to test different implementations against each other. Therefore, it
makes absolutely sense to embrace both topics by the WG. So in the end
we either have two WG documents or we attach the service interface to
the PL draft.

Joel is in support of adding it to the PL since there should only be
one service interface for all TMLs. He suggest to move a service
interface into the PL draft by the next meeting.





Presentation 3: Avri Doria
draft-forces-protocol-02.txt

Avri gave an update of the PL draft. It is the third version of the=20
draft. The focus is on the progress that has been made since version 02.

An issue tracker has been setup and it is being used. Something still=20
does not work with email responses going directly into the tracker. Avri

will ask the tools folks about it.

There was extensive discussion among the authors and some folks on the=20
list and also with the model team (especially with Joel) to bring the=20
protocol together with the model. Last time we had 2 separate documents=20
(model and the protocol) that went into 2 different directions. the=20
documents are are still not in complete harmony but significant progress

has been made due to Joel's help. In the mean time a number of tracker=20
issues have been closed, more details below.

On the protocol BNF the PATH TLV is one of the bigger changes and one=20
that impacts the whole PL draft. the presentation talks about=20
Operations. In the document we talk about Type and not Operation. We are

currently in the middle of a discussion on Types that are still called=20
Operations. The operation type is really the T in the TLV and it needs=20
to be expressed somehow properly in this BNF; sticking operation type in

there is not the correct solution. Avri just wanted to bring it out on=20
the slides because there still is an issue there.

Comment Joel: I am not really sure whether it belongs into the TLV in=20
this BNF.

There is till a sort of inconsistency in the document when you read type

we mean operation type. We have some language consistency to fix yet.

So there is PATH data TLV which includes a path and optionally data. The

path is flags, IDs, and selectors (optionally). Selectors are basically=20
the key info TLV that Joel was talking about. How it is used is not=20
fully understood yet. We have reached consensus on all the notations and

how it is being used.

Comment Joel: I think at the moment is is pretty clear how it is being=20
used. But we do not know how to use it in an Addition.

Comment Avri: there is still some work to be done there.

Data can be DATARAW or it can be one more nested PATH Data TLV.
The RESULT TLV is still to be defined. There are a couple of=20
implications of this. There can be one or more class LFB + instance=20
targeted in a message. There can be one or more operations on an address

LFB, class ID plus instance ID combo. There can be one or more path=20
targets per operation. It is assumed that the type of data can be=20
inferred by the context in which data is used. Hence, data will not=20
include its type information. There is some inconsistency between type=20
and operation. The basis for the inference is typically the LFB ID and=20
the path. Among the open issues we are discussing the efficiency of=20
encoding versus the efficiency of parsing and decoding and packaging=20
overhead. For example do we include block data and if we do, how does it

work. Or can we live without it? For the ones who have read the draft=20
you see still a lot of questions and editors notes and TBDs. Updates to=20
all the messages had to be made because of the PATH-DATA.

On the open issues.
Issue one on association setup / response has been closed. There were=20
originally 2 messages that have been merged into a single one.

Issue 2 was mainly an editorial change to section 6.5.1.

Issue 3 consisted of modifying the query and query response message to=20
include the PATH DATA with the limitation that when you do a GET=20
operation the PATH-DATA does not require DATARAW-TLV or RESULT-TLV.

Issue 5 was about defining events in XML as attributes. This was made=20
after discussions with the model team. So there will be a path that can=20
be used by the config message for subscription. But there are a lot of=20
open issues around this. So in the protocol we will use what comes up in

the model.

Issue 7 was on how paths are described in the protocol messages to=20
target a specific attribute or set of attributes. This caused a major=20
revision to the draft.

Transactions: an important feature for transactions is the ACIDity which

encompasses atomicity, consistency, isolation and Durability. There is=20
still a lot of discussion going on on this.

Abort message for doing rollback and the format of the response messages

is still not defined. We are trying to say enough about these things in=20
the PL draft but not restricting the implementation.

Then Avri went through the example of a protocol message given in the=20
slides where the structuring is illustrated. In the document there are=20
several of these protocol visualizations depicted. Avri encouraged=20
people to review them and report bugs and fixes.

On the XML for the FE protocol LFB, the definition has been started in=20
Appendix C but no further details are being presented at the meeting.=20
The working group is asked to review this Appendix carefully!

In Appendix D there are many examples and use cases given. The examples=20
  show how the protocol is supposed to be used. Please read through them

and make sure that they are clear. At the moment we are using in all the

examples type as command.

As a next step to proceed with the draft all the TBDs, editor notes, and

open issues note will be put in the tracker because we need to get them=20
out of the document. Also some references need to be fixed. In addition,

some consistency problems need to be fixed for example is it Type or=20
Operation. We also need to decide if there are additional appendices=20
required e.g. we definitely need one for types / commands. An IANA=20
sections needs to be created.

What is not on the list is a manageability sections that needs to be=20
created. This is necessary because there was a proposal made in the=20
routing area by Avri and others that every document in the routing area=20
should have a manageability section.  Avri, as an editor is supposed to=20
add the section to the documents she is working on as part of a pilot.

Additionally, a scrub for nits will be necessary since there are still a

bunch of them in. An important goal is certainly to get the document=20
closer to WGLC (WG last call). In order to advance the document to LC we

need many more people to read and comment on the document, so please=20
read! Probably it will not the the next revision that will make it to=20
WGLC. Another thing we will have to do because it is the routing area,=20
will be to have somebody from the routing directory or one of the ADs=20
assigned to the document so that when it comes to the time for last call

we got everything covered in terms of implementations and reviews


Chair / AD Discussion
---------------------

After the meeting I had some discussions with the ADs. They are fine
with making the FE Topology Discovery draft and the TCP/IP base TML
draft WG documents. In addition, we discussed the TML draft, especially
the data channel. Both ADs were against enforcing the data channel to
use TCP for any kind of transport. UDP or RAW packet should not go over
TCP. TCP in TCP is super positioning 2 flow control methods which may
lead to some unpredictable behavior. The WG has to find something more
appropriate for it. Last but not least the ADs suggest to start with a
simple MIB for ForCES. Things that might be included are the FE topology
that can be discovered by the ansari draft. Other things of interest
might be if the adjacency between FE and CE is up or down. We will need
to identify information we want to export from ForCES. Most of this
information is probably helpful to the operator of the box.


2005
Message-Id: <WED.23.MAR.2005.094325.0100.>
Date: Wed, 23 Mar 2005 09:43:25 +0100
From: Patrick Droz <dro@zurich.ibm.com>
Organization: IBM Research
Subject: ForCES Minutes, IETF 62 Minneapolis, USA
Comments: To: proceedings@ietf.org
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Minutes ForCES WG at the IETF62 in Minneapolis St. Paul, USA
------------------------------------------------------------

Agenda, IETF 62

Monday, March 7, 2005, 9:00-11:30
=================================

CHAIRS:   David Putzolu <David.Putzolu@intel.com>
           Patrick Droz <dro@zurich.ibm.com>

ADs:      Alex Zinin <zinin@psg.com>
           Bill Fenner <fenner@research.att.com>

AGENDA:

10 min - WG status & Agenda Bash - chairs

10 min   ForCES Intra-NE Topology Discovery
            Furquan Ansari
            draft-ansari-forces-discovery-01.txt

15 min - ForCES Forwarding Element Model
            Joel Halpern
            draft-ietf-forces-model-04.txt

30 min - TCP/IP based TML (Transport Mapping Layer) for ForCES protocol
            Shuchi Chawla
            draft-khosravi-forces-tcptml-01.txt

30 min - ForCES Protocol Draft Status & Changes
            Avri Doria or Jamal Salim
            draft-forces-protocol-02.txt

Minutes
-------

Attendees: 35

Unfortunately there was no volunteer to take minutes therefore,
I recorded the meeting.

The chairs began the meeting by reviewing the agenda and then going
over the status of the group. It was stated the the protocol was
expected to go through 1 or 2 more drafts before going to WG Last
Call.

----------

Presentation 1: Furquan Ansari
draft-ansari-forces-discovery-01.txt

We then went into a discussion on the first agenda item on FE topology
discovery. A first version of the draft had been presented in the last
IETF meeting but at that time not many people had read the document. In
the meantime quite some animated discussions took place on the mailing
list. And the list came to the consensus that the draft does make sense
and that is useful to have. There was no presentation of the draft. Main
topic was to decide whether we should adopt the draft as a WG draft.

Furquant repeats that the draft has been discussed on the list and that
it seems we have reached consensus on making it a WG draft.

Chair: proposes to make the draft a WG draft but wants to follow up
first with the ADs.

Q Avri: I am not against the draft but why do you have to check with the
ADs first?

A chair: Because the charter is too vague on that. It does not prevent
us from doing but also does not say we must do it.

After checking with the ADs the draft is now a WG document.

----------

Presentation 2 Joel Halpern
draft-ietf-forces-model-04.txt

There has been made significant progress on the model and the protocol
draft and especially to line them up with each other. He presents the
changes that have been made since the last version. Also the open issues
      were presented.

Changes in brief: in the previous draft there was a thing that described
the FE this was done by a separate schema and then the protocol team
asked to make this an LFB. So the model has been changed that the FE
information is now in an LFB class. There is now an ID for the class and
an ID for the instance. But there is only one instance. So this is now
much cleaner. There were several request to have the ability to address
tables and arrays by value. So there are now methods put in place to say
that this table can be referenced by value. People also wanted to have
methods to share information among multiple LFBs, this is now achieved
by introducing the alias mechanism. The model also turned out to have
some missing type definitions so one was added but a second one might be
needed as well.

Changes in more depth:
    - FE schema changed into an LFB class definition using the same schema
that all LFB classes are using. This is now the only LFB class that is
defined in the model document. The LFB class definition go now into a
library document. This class is assigned class ID 1 and instance ID 1.
It is important to note that it is always 1 since it is the
bootstrapping of the protocol. It captures all the information that was
in the FE schema. When the CE comes up it gets connection to the FE then
it says give me LFB class ID 1, instance ID 1. Give me the whole thing.
However, this is not mandatory. But this is the typical scenario.
Assigning the instance ID like this is a bit unusual. Certainly more
information need to ge into the LFB class, more capabilities and
attributes are needed. The list is asked to come up with the missing
pieces. Probably there will be a similar LFB class to represent the
interaction with the ForCES protocol with the FE. That will probably be
included in the protocol document because it has protocol relevant
information rather then model relevant information.
    - Element identifiers - The protocol now references information
through class ID, instance IF of an LFB and a sequence of attribute or
element identifiers with array subscripts. So those numbers need to be
defined. Each one is defined within a given scope. Within a given LFB
class they have to be unique. But they do not have to be unique across
classes. But it is much cleaner and simpler than what we had to do in
SNMP. However there is an interesting point. The way the protocol and
the model is structured we assume the LFB class ID are globally unique.
How to make that work? Global uniqueness is always an interesting
problem. Should we keep a global list of all the class IDs? We need to
do something to make them easily globally unique. At the moment we do
not know how to do it. LFB class, attributes, capabilities, and
structure element have an ID. There is an ongoing stylistic debate on
what belongs into attributes or nested tags. Many WGs that are using XML
are having this debate when to use tags and when to use attributes. So
we thought using attributes was an appropriate thing to do. If somebody
has an issue with this please speak up now or raise it on the list.
    - Content keying - There was a major request for the ability to
reference arrays and table elements by their content instead of just by
their subscript. So we are supporting this. Get and set operations are
supported. There was a big debate on the list what the scope of this
should be. Joel thinks there was WG consensus but he knows what he has
written on the foils. Key 'ContentKey' is only for predeclard keys and
they must be unique within their tables. There is an example given in
the presentation. You can declare to have multiple key fields and that
declares that the combination of multiple key fields in a single key.
That means the combination of the fields is the key and the combination
must have a unique value on every entry in the array. You can also have
multiple key declarations that declare each of these keys is unique in
every entry of the array and you can use anyone for reference. That is
the current compromise on content keying. How to call this keys is not
completely settled yet. There was also some XML violations that had to
be fixed. According to the XML folks introducing a container would solve
the problem. This is almost an editorial change. It does not affect the
protocol at all.
    - Alias -  There are situation and this can be debated for ever where
LFBs need to share information e.g. ARP LFB sharing MAC addresses. So a
way is needed to describe sharing. There are multiple ways to achieve
this e.g. an LFB owns the information and the other LFBs can point to
it. That approach is being taken. This is basically a pointer. Now what
are the properties of such pointers. The pointer needs to contain what
class of LFB it points to, what instance of the LFB you are pointing to,
what attribute within the LFB you are pointing to, and something that
you can use to get the data. So you can declare within a LFB class
definition or structure that something is an alias. An alias is used to
point to something else. An alias has a type. All the way the protocol
works everything is strictly typed. Therefore, the alias has to have a
type. So per alias we need to have four related pieces of information.
We wanted to have things simple. You create an alias, then give it a
type and under the cover create a structure that can take all four
pieces. They can be chained. The concept lets you easily reference
information at other places.

Q: if you make an alias and it points somewhere and then you remove that
element. What happens to the alias?
A: We do not want to require automatic cleanup. This is an important
question and we have to solve this. In other cases you may also point to
something that does not exist. So we would probably require that you get
back Nil / Null as a result. We need to define this and what the
behavior of dangling pointers is.

    - Open Issues -
The list of the 5 open issues is:
o Configured Adjacency Description -
o Element Meta Information
o Events
o Optional Elements
o Unlimited length strings

In more detail:
- Configured Adjacency Description - The FE object has in it a set of
information about configured FE neighbors. This is what the WG decided.
This includes information of the MAC and IP address of the neighbor.
This seems to be the natural way of configuring neighbors. Jamal raised
an interesting alternative. This kind of configured neighbors is really
used by the CE that has multiple things that it controls who are
neighbors to each others. A better way to discover this is the ansari
draft on FE topology discovery but there was a request to have the
configuration capability. So what when you just configured the neighbor
FE ID and the port that he reaches you. This will tell you how to send a
messages to the guy because this is enough information. So we basically
have to methods of identifying neighbors. What is important is that we
have to pick one method. It is important to note that this is for
configured neighbors and not for real discovery.
Q. What happens if you use both methods could you get a conflict.
A: Yes, if you configure both you could indeed get a conflict. You could
mix up some of the values. So you do not want to use both. We have to
pick one or the other. That is why I brought it up.

- Element Meta Information - We have LFB elements, structure elements,
in the model and referenced by the protocol. These elements have
properties. The simplest property is, does it exist, is it readable, is
it writeabel. It may have other properties. We have foreseen for LFB
level capabilities that are described in the model. And if you look at
the FE object LFB it has a capability section. So this was captured but
only at the LFB level. If you have an FE with a structure of option
elements, how do you know whether they are supported. If you have a
structure that is readable or read / writeabel how do you know what
information there is. Just try it? Maybe we need to find a consistent
way of talking about properties of elements. When you think about
arrays, arrays have an additional set of properties. How many elements
do you have currently, what is the highest subscript currently being
used, maybe what is the first hole that might be useful for reusing the
space. So arrays have more complicated properties. When you look at the
aliases I was showing you earlier, you can easily talk about pointers
that have properties of the actual pointer element. It makes the alias
cleaner if you can talk separately about the properties and its values.
Then the value would always be the pointer and the properties would be
the LFB attributes. So it seems that if we could talk about the
properties of any given piece of information in the LFB structures would
be a useful generalization. And we could use the class that we put into
the data path in the protocol to indicate that we are talk about the
property instead of the data. But this implies that we are talking about
how do we define what the property information is for each object we can
have. We can define those as structures themselves. So there are
structures for the array properties and so force. That would allow us to
consistently talk about them. Joel thinks that we should add this
feature. But it is a major increase in complexity. That is why he is
reluctant in doing it. Joel asked the floor for comments. There are just
some nodding heads but no comments. Joel will post additional
information on the subject to the list.

- Events - Thins can happen at the FE that the CE needs to know of.
These are things that need to observed now and not a certain period
afterwards. So we need to have a mechanism for the FE to send up reports
or notifications to the CE called events. A different thing would be
from the CE to the FE. We have to define a number of things about the
events. For each LFB we have to somehow say what events can each LFB
generate and we have to create some mechanism for the FE to say I want
this event. But as the number of events is probably going to be large we
do not want to mandate that each FE shall consider all events and each
CE will be perceived by each event. So depending what the elements are
doing they may not be interested in all the events. It might be
reasonable to be able to subscribe to events. So we need a way to
subscribe to events. We also have to create IDs for the events. I
identified two ways of defining the events but there are probably more.
One way of doing it is for each structure definition, for each array
definition you could include in it the event definition with the
structure definition and then create the appropriate identifiers with
boolean pieces for the sign-up. At the LFB level you would have another
event declaration for the LFB level of events. This gives some
simplicity to it but that is also its draw back. It means that when I
have the same structure used in multiple places one needs to know at
creation already who is interested in what. So this method is probably
not feasible. The other alternative is to have in the LFB definition an
event section in which you define all the events of interest for that
LFB. But that means you have to reference all the top level things and
any structures that are buried in arrays. So the whole thing ends up
with a much more complex naming problem. Though it is much more powerful
    and more verbose. Which one to pick is currently not known. That is
why I brought it up for discussion. But it is clear we need to have the
events defined somehow.

Q: Is correlation of events and root cause analysis within scope?
A: What I believe is within scope is we have to define what is supported
    in the events whatever method we are going to use. I don't think that
correlation and root cause analysis is our problem but we should have
enough information such that is useful for the CE to find out what heck
to do with this. If for example an Ethernet switch is failing that is
certainly not a ForCES problem. It is however an important problem.

Q: Can I turn on and off all events or can I turn on and off some
events for a certain table?
A: We probably have to allow some of these things but I hope we will not
go overboard with this! This can become very complicated especially for
the FE. I hope we can keep this simple to implement. Scope sign-up's on
tables has not been put in yet but Jamal really would like to have it.
For example I would like to have a status update for every port up or
down on a certain table. And you do not need to sign up for every new
port for that particular event. Side comment, event history is not the
FE's job. This is definitely the CE's job.

Q: Are events reliable.
A: The ForCES protocol is reliable and so are the events. They run over
TML and this is for example TCP which is reliable.

There are 2 more changes to the model. One went in the other did not.
The model had text strings that had a fixed length. This was always
fixed. There were multiple places while I was doing the LFB FE object
where I needed a binary string which was up to a certain length but was
not always that length. So I added a type for that one. Strings are
defined as variable length but they have a length limit. In some places
we needed unlimited length. In some cases it was unclear whether we
needed a length or not and if yes how long it should be. And I think it
is not the model's job to say it must be length so and so. So we
probably need an unlimited length string in the model. And a property of
such a string would be how long it is.

Q: But unlimited length strings do have security problems.
A: No the security problem comes from buffer overflow. But in our case
the CE or FE has to make sure the the unlimited length string is not
going to exceed the size of the buffer. The security problem comes only
if you do a bad job of implementing this. We can define a max length and
maybe we should but I could not come up with a length limit that made
any sense. So folks may look at the FE LFB definition and see if they
can come up with a reasonable length limit for every place I had to put
in a length limit. Or we can go with an unlimited length string.

What was also added are derived classes to the model. How to implement
this is part of the XML debate.


Presentation 2: Shuchi Chawla
draft-khosravi-forces-tcptml-01.txt

I will go through the revisions that have been made to the draft since
the last meeting. I will start with a brief overview of the TCP/IP based
TML. Due to the ForCES requirements of reliability and flow control we
have picked TCP. By picking TCP the TML does not have to do any
additional things to meet those 2 requirements. Then ForCES also
requires that security should be addressed so we propose to use TLS for
security. As in the ForCES protocol the CE is the master and the FE is
the slave, the CE would be setup as the TLS server and the FE as the TLS
client. The TML draft allows for unicast, multicast and broadcast
addressing. Unicast is supported by using standard TCP/IP channels and
multicast would be simulated through multiple channels. Some more
details will follow later. The TML draft supports prioritization in TML
messages and it also prioritizes control messages over data messages. by
using different data and control channels. At the moment the TML draft
proposes a TML header to do encapsulation. This is currently under
discussion. The reason for it was to have additional signaling messages
for multicast support. So the goal is to investigate how to make things
as lean as possible. The support of high availability (HA) has not been
detailed yet what we have specified yet is that if the PL heart beat
does not continue we would use the TML heart beat. There are methods in
place to do fast switch over between the active and a standby FE or CE.
DoS attacks are mitigated by the separation of control and data
channels. When the data channels gets flooded with malicious traffic the
control channel still remains operational. In addition, the control
messages are prioritized over data packets.

It is only recommended to use two TCP connections between the CE and FE,
one for control the other for data. In case of a standby CE we would
have additional 2 TCP channels between the backup CE and the FE. In
terms of functions the CE is considered to be the server and the FE the
clients. So the CE is the one that is listing on predefined ports and
the FEs are going to connect to them. Channel shut down can be initiated
by both sides. There is a diagram in the slides that shows how the setup
/ tear down looks.

Q: Question on how the exact hand over between a failed active CE and a
backup CE would work. - lengthy discussion including what the hardware
can do or not -
Editors comment and summarization: There was mainly some confusion what
the exact definition of a backup CE is. Everything seemed to be clear by
assuming that the backup CE just listens to everything and maintains all
the states from the active CE without actively sending out messages.
That is one of the HA Models.  However, various HA models are possible
where the backup CE may not be completely passive or there might be load
sharing etc.  The final conclusion (with Joel adding the final comment)
was that the TML draft should not specify the HA Model or what can /
cannot occur over the channels to the backup CE(s). It is outside the
scope of TML.  All that the TML draft should specify is that control and
data channels must be established between the CE and FE, and in case of
a switchover from the active to the standby CE, the FE should be able to
communicate to the standby CE (or in other words, the new active) using
the TCP TML channels.

Unicast and multicast is supported over unicast links. The multicast is
simulated over multiple unicast channels. This required the introduction
of additional TML messages that are used for join and leave operation on
multicast connections. The message are then replicated according to the
FEs that are part of a certain multicast group. It is kind of the
traditional multicast with the root at the CE and the leaves at the FEs.
    So it is assumed that the FE is configured with multicast group
information.

Q: why do you do that. This model already has been significantly
modified in the SSM (Source Specific Multicast) model. In the ForCES
case it is sender driven, the sender knows what to send where. An FE
never knows what a particular CE wants to achieve. The sender knows
exactly what to send to whom. Avri is not so sure about that. Joel is
the opinion that we get a much simpler behavior if we do not try to
mimic multicast.
A: We were investigating 2 multicast models -- one which is FE
initiated/configured mimicking traditional multicast, and one which is
CE configured.  We picked the one which is FE initiated under the
assumption that since it mimics traditional multicast we wouldn't be
reinventing the multicast model.  But if the ForCES use of multicast is
expected to be slightly different from what occurs in traditional
multicast, we will revisit this.

The proposed multicast schema is currently under investigation to find
out whether it can me made leaner and simpler. The CE could for example
tell to the FE in which multicast group they are which means we do not
have to mimic join and leave messages. Another thing is that the same
channel is used for unicast and multicast. The group / channel
descriptor is going to distinguish if a message has to be sent to a
single FE or needs to be replicated for a multicast group including
multiple FEs.

The TML supports to carry PL control and data messages and if we cannot
do away with TML control messages also the TML control messages. In case
we have TML control messages then there would be a TML shim header in
order to support these messages. TML and PL control messages would be
exchanged on the same control channel. The exact definition of the
header can be found in the slides and the draft. A simplification of the
header would be very welcome. The draft contains also an interface to
the PL in the form of an API as a guideline of what functionality the
TML can provide to the PL layer.

Q: (Joel) a guideline is probably not sufficient. We need to mandate
exactly what the TML can provide to the PL. We also should not provide
this in the form of an API but rather in terms of a service interface.
This service interface should be generic to all TML. He does not care
whether the spec goes into one of the TML drafts or in the PL draft.
A: I agree. We started off with an API definition. We just needed to
start somewhere but we know we will have to evolve this into the exact
service interface that the TML will provide. This service interface
could also go into a separate draft.

Then the functionality of the current API proposal is presented (see the
foils). The services are:
    - tmlInit
    - tmlOpen
    - tmlClose
    - tmlWrite
    - tmlRead
    - tmlMulticastGroupJoin
    - tmlMulticastGroupLeave
In the current model tmlOpen and the last 2 are FE initiated.

Then the setup procedure is shown (see foils). Then the same thing is
shown for multicast support (see foils). The presentation is given
according to the currently proposed multicast model. If the multicast
model would be changed into a more CE driven model then the join and
leave messages would not be necessary anymore.

    - Open Issues - Broadcast has not been addressed so far. HA needs to
be  spelled out in much more detail. Message prioritization also needs
further details. Finally message encapsulation and multicast model needs
additional work. Shuchi concludes with a summary of the presentation.

Finally Shuchi asks to make this draft a WG document. The chair asked
the floor if there are any objections to make this draft a WG document.
There was no opposition. The chairs and ADs had discussed this before
and  there was also no objections. Therefore, the draft became a WG
document. But the chair raised again some points:
- data channel using TCP from the TML even if it is a raw or UDP
connection. Probably many routing protocol people will not at all like
this as they are taking care themselves of flow control and retransmit.
Also RDMA support should be thought of.
A; we are considering tunneling like GRE or DCCP to address the issue.

Comment from Joel: yes this should be a working group document but that
does not mean we take the draft as is. Joel is also the opinion that
DCCP might be a good alternative for the data channel. Take this draft
as good start and progress on it.

Chair comment: the service interface should either be a separate draft
or part of the PL. Important is that the service interface is generic to
the underlying TML as we want to have the option of swapping TMLs.

Q Avri: by making this a WG draft does it mean we are considering the
work on service interface and TML as WG issues. Can we split thing apart
later or not?
A chair: we basically have agreed on the list already that we need a
generic service interface usable for multiple TMLs. We also need a TML
to test different implementations against each other. Therefore, it
makes absolutely sense to embrace both topics by the WG. So in the end
we either have two WG documents or we attach the service interface to
the PL draft.

Joel is in support of adding it to the PL since there should only be
one service interface for all TMLs. He suggest to move a service
interface into the PL draft by the next meeting.





Presentation 3: Avri Doria
draft-forces-protocol-02.txt

Avri gave an update of the PL draft. It is the third version of the
draft. The focus is on the progress that has been made since version 02.

An issue tracker has been setup and it is being used. Something still
does not work with email responses going directly into the tracker. Avri
will ask the tools folks about it.

There was extensive discussion among the authors and some folks on the
list and also with the model team (especially with Joel) to bring the
protocol together with the model. Last time we had 2 separate documents
(model and the protocol) that went into 2 different directions. the
documents are are still not in complete harmony but significant progress
has been made due to Joel's help. In the mean time a number of tracker
issues have been closed, more details below.

On the protocol BNF the PATH TLV is one of the bigger changes and one
that impacts the whole PL draft. the presentation talks about
Operations. In the document we talk about Type and not Operation. We are
currently in the middle of a discussion on Types that are still called
Operations. The operation type is really the T in the TLV and it needs
to be expressed somehow properly in this BNF; sticking operation type in
there is not the correct solution. Avri just wanted to bring it out on
the slides because there still is an issue there.

Comment Joel: I am not really sure whether it belongs into the TLV in
this BNF.

There is till a sort of inconsistency in the document when you read type
we mean operation type. We have some language consistency to fix yet.

So there is PATH data TLV which includes a path and optionally data. The
path is flags, IDs, and selectors (optionally). Selectors are basically
the key info TLV that Joel was talking about. How it is used is not
fully understood yet. We have reached consensus on all the notations and
how it is being used.

Comment Joel: I think at the moment is is pretty clear how it is being
used. But we do not know how to use it in an Addition.

Comment Avri: there is still some work to be done there.

Data can be DATARAW or it can be one more nested PATH Data TLV.
The RESULT TLV is still to be defined. There are a couple of
implications of this. There can be one or more class LFB + instance
targeted in a message. There can be one or more operations on an address
LFB, class ID plus instance ID combo. There can be one or more path
targets per operation. It is assumed that the type of data can be
inferred by the context in which data is used. Hence, data will not
include its type information. There is some inconsistency between type
and operation. The basis for the inference is typically the LFB ID and
the path. Among the open issues we are discussing the efficiency of
encoding versus the efficiency of parsing and decoding and packaging
overhead. For example do we include block data and if we do, how does it
work. Or can we live without it? For the ones who have read the draft
you see still a lot of questions and editors notes and TBDs. Updates to
all the messages had to be made because of the PATH-DATA.

On the open issues.
Issue one on association setup / response has been closed. There were
originally 2 messages that have been merged into a single one.

Issue 2 was mainly an editorial change to section 6.5.1.

Issue 3 consisted of modifying the query and query response message to
include the PATH DATA with the limitation that when you do a GET
operation the PATH-DATA does not require DATARAW-TLV or RESULT-TLV.

Issue 5 was about defining events in XML as attributes. This was made
after discussions with the model team. So there will be a path that can
be used by the config message for subscription. But there are a lot of
open issues around this. So in the protocol we will use what comes up in
the model.

Issue 7 was on how paths are described in the protocol messages to
target a specific attribute or set of attributes. This caused a major
revision to the draft.

Transactions: an important feature for transactions is the ACIDity which
encompasses atomicity, consistency, isolation and Durability. There is
still a lot of discussion going on on this.

Abort message for doing rollback and the format of the response messages
is still not defined. We are trying to say enough about these things in
the PL draft but not restricting the implementation.

Then Avri went through the example of a protocol message given in the
slides where the structuring is illustrated. In the document there are
several of these protocol visualizations depicted. Avri encouraged
people to review them and report bugs and fixes.

On the XML for the FE protocol LFB, the definition has been started in
Appendix C but no further details are being presented at the meeting.
The working group is asked to review this Appendix carefully!

In Appendix D there are many examples and use cases given. The examples
  show how the protocol is supposed to be used. Please read through them
and make sure that they are clear. At the moment we are using in all the
examples type as command.

As a next step to proceed with the draft all the TBDs, editor notes, and
open issues note will be put in the tracker because we need to get them
out of the document. Also some references need to be fixed. In addition,
some consistency problems need to be fixed for example is it Type or
Operation. We also need to decide if there are additional appendices
required e.g. we definitely need one for types / commands. An IANA
sections needs to be created.

What is not on the list is a manageability sections that needs to be
created. This is necessary because there was a proposal made in the
routing area by Avri and others that every document in the routing area
should have a manageability section.  Avri, as an editor is supposed to
add the section to the documents she is working on as part of a pilot.

Additionally, a scrub for nits will be necessary since there are still a
bunch of them in. An important goal is certainly to get the document
closer to WGLC (WG last call). In order to advance the document to LC we
need many more people to read and comment on the document, so please
read! Probably it will not the the next revision that will make it to
WGLC. Another thing we will have to do because it is the routing area,
will be to have somebody from the routing directory or one of the ADs
assigned to the document so that when it comes to the time for last call
we got everything covered in terms of implementations and reviews


Chair / AD Discussion
---------------------

After the meeting I had some discussions with the ADs. They are fine
with making the FE Topology Discovery draft and the TCP/IP base TML
draft WG documents. In addition, we discussed the TML draft, especially
the data channel. Both ADs were against enforcing the data channel to
use TCP for any kind of transport. UDP or RAW packet should not go over
TCP. TCP in TCP is super positioning 2 flow control methods which may
lead to some unpredictable behavior. The WG has to find something more
appropriate for it. Last but not least the ADs suggest to start with a
simple MIB for ForCES. Things that might be included are the FE topology
that can be discovered by the ansari draft. Other things of interest
might be if the adjacency between FE and CE is up or down. We will need
to identify information we want to export from ForCES. Most of this
information is probably helpful to the operator of the box.



















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2005
Message-Id: <THU.17.MAR.2005.100329.0500.>
Date: Thu, 17 Mar 2005 10:03:29 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: ZNYX Networks
Subject: Re: FE-CE data path
Comments: To: "Chawla, Shuchi" <shuchi.chawla@intel.com>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

On Wed, 2005-03-16 at 17:24, Chawla, Shuchi wrote:

> Given the above, it seems that there is some amount of processing
> occurring on these packets in the FE, due to which, I'm wondering if we
> can really do wire-speed processing/tunneling of these packets at the
> FE?  Am I missing something?
>

Depends on your FE to quantify what you mean by "some amount of
processing" and its effect on wire speed processing. Note as well
Joels point that wirespeed maynot be a necessary need if theres no
traffic to justify it ("I have 1G but i only use 1Mbps")

If your LFB piece on the FE resides in an ASIC, FPGA or a NP, then the
processing happens within the ASIC/FPGA/NP. The VLAN redirection to CE
example i gave earlier happens in an ASIC.
Clearly if your LFB was in some s/ware running in an FE general purposes
CPU then you may run into _relatively_ more performance challenges.
And if you want to make something complex such as put TCP header around
it, you will have to process in such a CPU given the complexity of the
state machine.

Hence my assertion earlier: if i can do the redirection within hardware
and avoid putting any PL/TML wrappers, id be just as happy - but if i
found an FE that didnt understand my VLAN redirection then i would be
forced to redirect to something on the FE that will do extra processing
of putting wrappers around the redirected packet.

cheers,
jamal


2005
Message-Id: <WED.16.MAR.2005.174842.0500.>
Date: Wed, 16 Mar 2005 17:48:42 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: FE-CE data path
Comments: To: "Chawla, Shuchi" <shuchi.chawla@INTEL.COM>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

That is mostly correct.

I would clarify that LFBs only decide what they are defined to decide.  An
LFBs whose job is "forward data packet to CE" will generally not ~decide~
whether to do so, but rather will just do so.  Some combination of
classifier and brancher LFBs will have "decided" by sending the packet to
that specific LFB for processing.

As for wire speed...
a) I guess it depends upon the wire
b) even software implementations can keep up with slow wires
c) it is expected that ForCES functionality may in some cases be
implemented in ASICs or FPGAs, which can keep up with higher rates.
c') I have seen FPGAs which can be driven by flexible connectiivity tables
and still keep up with good wire speeds (1 gigbit + while performing many
functions on the packets.)
d) Of course, it also depends upon how much you want to do to the
packet.  A medium transcoder might have trouble, no matter how simple the
ForCES framework, if told to run at 10 gigabits.

Yours,
Joel

At 05:38 PM 3/16/2005, Chawla, Shuchi wrote:
>I believe I am also having a problem getting my messages through...here is
>what I had sent, which didn't make it.
>
>Thanks for the information, Joel.  Just to confirm that I have understood
>what you have said:
>
>- An LFB instance would need to exist on the FE to do the required
>protocol processing (in the example below, the SAAL LFB).  The CE would be
>made aware of this FE capability via a capability query.
>- An LFB on the FE would need to process "data" packets associated with
>control processing and make a determination as to whether they should be
>sent to the CE (via some protocol), or to an LFB (in the example below,
>SAAL LFB) on the FE itself for further processing.
>
>Is that correct?
>
>Given the above, it seems that there is some amount of processing
>occurring on these packets in the FE, due to which, I'm wondering if we
>can really do wire-speed processing/tunneling of these packets at the FE?
>Am I missing something?
>
>Thanks,
>Shuchi
>
>On Wed, 16 Mar 2005 16:27:52 -0500, Joel M. Halpern
><joel@stevecrocker.com> wrote:
>
> >This kind of distirbution can be done.
> >In fact, if the FE has capabilities to help the CE, the CE can make use of
> >those at it sees fit.
> >
> >There are two aspects to this, both related to LFB topology.
> >
> >Firstly, there is the matter of how the FE will decide to send data
>packets
> >to the CE.  I expect that this will be represented by an instance of an
>LFB
> >class representing the data channel itnerface.  Thus, the LFB topology and
> >classifiers therein can be arranged to select traffic according to
>whatever
> >conditions are interesting (including errors, etc) and direct that traffic
> >to the LFB instance which will send it to the CE.  Similarly, this LFB
> >instance can also be used as a packet source for data packets from the
> >CE.  The topology configuration will determine what the FE does with such
> >packets.
> >
> >Secondly, one can have LFB classes (and instances of those classes) to
> >represent capabilities provided by the processor on the FE.  (In some
> >implementations, all LFBs are provided by softwware on the FE.)  So if we
> >want to represent an SAAL processor on the FE, we will need an LFB class
> >definition for the capability.  Then, a CE working with an FE which
> >supports that LFB class can choose to make use of it.
> >
> >Yours,
> >Joel M. Halpern
> >
> >At 04:17 PM 3/16/2005, Chawla, Shuchi wrote:
> >>I have a slightly tangential comment/question to all of this which may
> >>impact the FE-CE data channel discussion -- I'm not sure.  Anyway, here
> >>is it:
> >>
> >>I believe there are instances where some part of the control protocol
> >>processing may be distributed between the FE and the CE; in effect, a
> >>part (maybe the lower layers) of the protocol processing may be done on
> >>the FE, and a part of it on the CE.  As an example, I am familiar with
> >>an ATM switch I was involved in, that did SAAL processing on the FE and
> >>Q.2931 processing on the CE, thus distributing the processing of ATM
> >>signaling between the FEs and the CE.  The FEs had adequate processing
> >>capability in this case and this also reduced the burden on the CE of
> >>doing SAAL processing for a large number of FEs/interfaces.
> >>
> >>The above are protocols associated with the data channel.  Given that
> >>the current model is for the packets associated with the data channel to
> >>be transported to the CE (either via a tunnel or using a transport
> >>protocol etc. based on the decision reached), I'm wondering how such a
> >>distributed control processing model might fit into the overall
> >>framework.  In the example above, the SAAL messages would need to be
> >>terminated on the FE, whereas the Q.2931 messages would need to be
> >>transported to the CE.  This might imply some sort of inspection of the
> >>data packets themselves, I assume.
> >>
> >>Maybe this has been addressed in earlier discussions; if so, could you
> >>please point me to the relevant information?
> >>
> >>Regards,
> >>Shuchi
> >>
> >>-----Original Message-----
> >>From: Forwarding and Control Element Separation
> >>[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Furquan Ansari
> >>Sent: Wednesday, March 16, 2005 12:11 PM
> >>To: FORCES@PEACH.EASE.LSOFT.COM
> >>Subject: Re: FE-CE data path
> >>
> >>Hmm...Not sure if there is a problem with the list server of my outgoing
> >>email - my mails to this list are not going. This is the 4th time I am
> >>trying, but this time posting it directly using the web interface!
> >>Hope it works...
> >>
> >>-----------
> >>
> >>Looks like that didn't work either - let me try it again....!!!
> >>
> >>
> >>Subject:
> >>Re: FE-CE data path
> >>From:
> >>"Furquan A. Ansari" <furquan@lucent.com>
> >>Date:
> >>Wed, 16 Mar 2005 14:08:52 -0500
> >>To:
> >>FORCES@PEACH.EASE.LSOFT.COM
> >>
> >>Ok.... I tried sending this long time back - but looks like something
> >>happened and hasn't been received by the list.
> >>So, here goes - again.....
> >>
> >>----
> >>Yes, good point indeed, Joel. I misinterpreted your question regarding
> >>"what
> >>interface they arrive on" to mean at the CE (de-mux diff tunnel
> >>interfaces).
> >>And, no  Hormuzd, I am not advocating having one tunnel per external FE
> >>interface - that would be a pretty foolish thing to do. There will be a
> >>single interface from an FE to a CE.
> >>
> >>As a matter of fact, I have the CE/FE combination running as a normal
> >>router
> >>- with OSPF etc. and should have looked at my own implementation more
> >>carefully. One would indeed require/need the arriving interface
> >>information
> >>- e.g.  if the packet is destined to a multicast address like OSPF
> >>packets
> >>(for unicast, one can derive it from the destination address). Having
> >>said
> >>that, the discussion of appending/providing some information to obtain
> >>this
> >>result (intf info)  is different from needing a transport layer
> >>protocol.
> >>There's nothing preventing one from still using a tunnel with the
> >>information added - e.g. as Jamal pointed out in the VLAN example.
> >>
> >>My motivation for tunnelling is to allow a packet to be forwarded at
> >>wire-speed (ASICs) without it seeing the light of day at the processor
> >>of
> >>the FE.  However, if some additional header/tag requires it to be pulled
> >>out
> >>anyway, the performace advantages may not be that significant.
> >>
> >>
> >>On a side note - I should have brought out this question long time back
> >>with
> >>respect to the protocol draft (headers) but ended up simply using my own
> >>propietary mechanism to ship the interface arrival information. The
> >>current
> >>redirect header (PL header) does not contain any place on the header to
> >>provide such information at all.
> >>
> >>Thanks,
> >>
> >>
> >>Khosravi, Hormuzd M wrote:
> >>
> >>Good point, Joel. This is one of the reasons we would need a some/PL
> >>header for data packets.
> >>
> >>I am not sure this would be solved with tunnels, unless you setup a
> >>tunnel per external FE interface and that could be several hundred
> >>tunnels if there are as many interfaces on the router.
> >>You need this information (on which port/interface a packet arrived on
> >>the FE), for multicast forwarding.
> >>
> >>regards
> >>Hormuzd
> >>
> >>-----Original Message-----
> >>From: Forwarding and Control Element Separation
> >>[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern
> >>
> >>
> >>
> >>5) I am essentially saying that in some sense the TML header is the
> >>
> >>
> >>tunnel
> >>
> >>
> >>protocol header. I really don't see
> >>the need for the "data" packets to be going through the ForCES PL layer
> >>
> >>
> >>
> >>
> >>
> >>for de-muxing to appropriate application (OSPF, BGP etc.) - Put it
> >>
> >>
> >>another
> >>
> >>
> >>way, I am basically saying that there is no PL or TML header for the
> >>
> >>
> >>data
> >>
> >>
> >>packets - since tunneling will be transparent to the applications.
> >>
> >>
> >>
> >>The data packets need some sort of header since we must know what
> >>interface
> >>they arrived on, what FE sent them to the CE, and why the CE sent
> >>them.  That information can not reliably be determined purely from the
> >>underlying packet.
> >>
> >>Yours,
> >>Joel M. Halpern
>
>[deleted]


2005
Message-Id: <WED.16.MAR.2005.173840.0500.>
Date: Wed, 16 Mar 2005 17:38:40 -0500
From: "Chawla, Shuchi" <shuchi.chawla@INTEL.COM>
Subject: Re: FE-CE data path
Comments: To: Joel Halpern <joel@STEVECROCKER.COM>

I believe I am also having a problem getting my messages through...here is
what I had sent, which didn't make it.

Thanks for the information, Joel.  Just to confirm that I have understood
what you have said:

- An LFB instance would need to exist on the FE to do the required
protocol processing (in the example below, the SAAL LFB).  The CE would be
made aware of this FE capability via a capability query.
- An LFB on the FE would need to process "data" packets associated with
control processing and make a determination as to whether they should be
sent to the CE (via some protocol), or to an LFB (in the example below,
SAAL LFB) on the FE itself for further processing.

Is that correct?

Given the above, it seems that there is some amount of processing
occurring on these packets in the FE, due to which, I'm wondering if we
can really do wire-speed processing/tunneling of these packets at the FE?
Am I missing something?

Thanks,
Shuchi

On Wed, 16 Mar 2005 16:27:52 -0500, Joel M. Halpern
<joel@stevecrocker.com> wrote:

>This kind of distirbution can be done.
>In fact, if the FE has capabilities to help the CE, the CE can make use of
>those at it sees fit.
>
>There are two aspects to this, both related to LFB topology.
>
>Firstly, there is the matter of how the FE will decide to send data
packets
>to the CE.  I expect that this will be represented by an instance of an
LFB
>class representing the data channel itnerface.  Thus, the LFB topology and
>classifiers therein can be arranged to select traffic according to
whatever
>conditions are interesting (including errors, etc) and direct that traffic
>to the LFB instance which will send it to the CE.  Similarly, this LFB
>instance can also be used as a packet source for data packets from the
>CE.  The topology configuration will determine what the FE does with such
>packets.
>
>Secondly, one can have LFB classes (and instances of those classes) to
>represent capabilities provided by the processor on the FE.  (In some
>implementations, all LFBs are provided by softwware on the FE.)  So if we
>want to represent an SAAL processor on the FE, we will need an LFB class
>definition for the capability.  Then, a CE working with an FE which
>supports that LFB class can choose to make use of it.
>
>Yours,
>Joel M. Halpern
>
>At 04:17 PM 3/16/2005, Chawla, Shuchi wrote:
>>I have a slightly tangential comment/question to all of this which may
>>impact the FE-CE data channel discussion -- I'm not sure.  Anyway, here
>>is it:
>>
>>I believe there are instances where some part of the control protocol
>>processing may be distributed between the FE and the CE; in effect, a
>>part (maybe the lower layers) of the protocol processing may be done on
>>the FE, and a part of it on the CE.  As an example, I am familiar with
>>an ATM switch I was involved in, that did SAAL processing on the FE and
>>Q.2931 processing on the CE, thus distributing the processing of ATM
>>signaling between the FEs and the CE.  The FEs had adequate processing
>>capability in this case and this also reduced the burden on the CE of
>>doing SAAL processing for a large number of FEs/interfaces.
>>
>>The above are protocols associated with the data channel.  Given that
>>the current model is for the packets associated with the data channel to
>>be transported to the CE (either via a tunnel or using a transport
>>protocol etc. based on the decision reached), I'm wondering how such a
>>distributed control processing model might fit into the overall
>>framework.  In the example above, the SAAL messages would need to be
>>terminated on the FE, whereas the Q.2931 messages would need to be
>>transported to the CE.  This might imply some sort of inspection of the
>>data packets themselves, I assume.
>>
>>Maybe this has been addressed in earlier discussions; if so, could you
>>please point me to the relevant information?
>>
>>Regards,
>>Shuchi
>>
>>-----Original Message-----
>>From: Forwarding and Control Element Separation
>>[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Furquan Ansari
>>Sent: Wednesday, March 16, 2005 12:11 PM
>>To: FORCES@PEACH.EASE.LSOFT.COM
>>Subject: Re: FE-CE data path
>>
>>Hmm...Not sure if there is a problem with the list server of my outgoing
>>email - my mails to this list are not going. This is the 4th time I am
>>trying, but this time posting it directly using the web interface!
>>Hope it works...
>>
>>-----------
>>
>>Looks like that didn't work either - let me try it again....!!!
>>
>>
>>Subject:
>>Re: FE-CE data path
>>From:
>>"Furquan A. Ansari" <furquan@lucent.com>
>>Date:
>>Wed, 16 Mar 2005 14:08:52 -0500
>>To:
>>FORCES@PEACH.EASE.LSOFT.COM
>>
>>Ok.... I tried sending this long time back - but looks like something
>>happened and hasn't been received by the list.
>>So, here goes - again.....
>>
>>----
>>Yes, good point indeed, Joel. I misinterpreted your question regarding
>>"what
>>interface they arrive on" to mean at the CE (de-mux diff tunnel
>>interfaces).
>>And, no  Hormuzd, I am not advocating having one tunnel per external FE
>>interface - that would be a pretty foolish thing to do. There will be a
>>single interface from an FE to a CE.
>>
>>As a matter of fact, I have the CE/FE combination running as a normal
>>router
>>- with OSPF etc. and should have looked at my own implementation more
>>carefully. One would indeed require/need the arriving interface
>>information
>>- e.g.  if the packet is destined to a multicast address like OSPF
>>packets
>>(for unicast, one can derive it from the destination address). Having
>>said
>>that, the discussion of appending/providing some information to obtain
>>this
>>result (intf info)  is different from needing a transport layer
>>protocol.
>>There's nothing preventing one from still using a tunnel with the
>>information added - e.g. as Jamal pointed out in the VLAN example.
>>
>>My motivation for tunnelling is to allow a packet to be forwarded at
>>wire-speed (ASICs) without it seeing the light of day at the processor
>>of
>>the FE.  However, if some additional header/tag requires it to be pulled
>>out
>>anyway, the performace advantages may not be that significant.
>>
>>
>>On a side note - I should have brought out this question long time back
>>with
>>respect to the protocol draft (headers) but ended up simply using my own
>>propietary mechanism to ship the interface arrival information. The
>>current
>>redirect header (PL header) does not contain any place on the header to
>>provide such information at all.
>>
>>Thanks,
>>
>>
>>Khosravi, Hormuzd M wrote:
>>
>>Good point, Joel. This is one of the reasons we would need a some/PL
>>header for data packets.
>>
>>I am not sure this would be solved with tunnels, unless you setup a
>>tunnel per external FE interface and that could be several hundred
>>tunnels if there are as many interfaces on the router.
>>You need this information (on which port/interface a packet arrived on
>>the FE), for multicast forwarding.
>>
>>regards
>>Hormuzd
>>
>>-----Original Message-----
>>From: Forwarding and Control Element Separation
>>[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern
>>
>>
>>
>>5) I am essentially saying that in some sense the TML header is the
>>
>>
>>tunnel
>>
>>
>>protocol header. I really don't see
>>the need for the "data" packets to be going through the ForCES PL layer
>>
>>
>>
>>
>>
>>for de-muxing to appropriate application (OSPF, BGP etc.) - Put it
>>
>>
>>another
>>
>>
>>way, I am basically saying that there is no PL or TML header for the
>>
>>
>>data
>>
>>
>>packets - since tunneling will be transparent to the applications.
>>
>>
>>
>>The data packets need some sort of header since we must know what
>>interface
>>they arrived on, what FE sent them to the CE, and why the CE sent
>>them.  That information can not reliably be determined purely from the
>>underlying packet.
>>
>>Yours,
>>Joel M. Halpern

[deleted]


2005
Message-Id: <WED.16.MAR.2005.162752.0500.>
Date: Wed, 16 Mar 2005 16:27:52 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: FE-CE data path
Comments: To: "Chawla, Shuchi" <shuchi.chawla@intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

This kind of distirbution can be done.
In fact, if the FE has capabilities to help the CE, the CE can make use of
those at it sees fit.

There are two aspects to this, both related to LFB topology.

Firstly, there is the matter of how the FE will decide to send data packets
to the CE.  I expect that this will be represented by an instance of an LFB
class representing the data channel itnerface.  Thus, the LFB topology and
classifiers therein can be arranged to select traffic according to whatever
conditions are interesting (including errors, etc) and direct that traffic
to the LFB instance which will send it to the CE.  Similarly, this LFB
instance can also be used as a packet source for data packets from the
CE.  The topology configuration will determine what the FE does with such
packets.

Secondly, one can have LFB classes (and instances of those classes) to
represent capabilities provided by the processor on the FE.  (In some
implementations, all LFBs are provided by softwware on the FE.)  So if we
want to represent an SAAL processor on the FE, we will need an LFB class
definition for the capability.  Then, a CE working with an FE which
supports that LFB class can choose to make use of it.

Yours,
Joel M. Halpern

At 04:17 PM 3/16/2005, Chawla, Shuchi wrote:
>I have a slightly tangential comment/question to all of this which may
>impact the FE-CE data channel discussion -- I'm not sure.  Anyway, here
>is it:
>
>I believe there are instances where some part of the control protocol
>processing may be distributed between the FE and the CE; in effect, a
>part (maybe the lower layers) of the protocol processing may be done on
>the FE, and a part of it on the CE.  As an example, I am familiar with
>an ATM switch I was involved in, that did SAAL processing on the FE and
>Q.2931 processing on the CE, thus distributing the processing of ATM
>signaling between the FEs and the CE.  The FEs had adequate processing
>capability in this case and this also reduced the burden on the CE of
>doing SAAL processing for a large number of FEs/interfaces.
>
>The above are protocols associated with the data channel.  Given that
>the current model is for the packets associated with the data channel to
>be transported to the CE (either via a tunnel or using a transport
>protocol etc. based on the decision reached), I'm wondering how such a
>distributed control processing model might fit into the overall
>framework.  In the example above, the SAAL messages would need to be
>terminated on the FE, whereas the Q.2931 messages would need to be
>transported to the CE.  This might imply some sort of inspection of the
>data packets themselves, I assume.
>
>Maybe this has been addressed in earlier discussions; if so, could you
>please point me to the relevant information?
>
>Regards,
>Shuchi
>
>-----Original Message-----
>From: Forwarding and Control Element Separation
>[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Furquan Ansari
>Sent: Wednesday, March 16, 2005 12:11 PM
>To: FORCES@PEACH.EASE.LSOFT.COM
>Subject: Re: FE-CE data path
>
>Hmm...Not sure if there is a problem with the list server of my outgoing
>email - my mails to this list are not going. This is the 4th time I am
>trying, but this time posting it directly using the web interface!
>Hope it works...
>
>-----------
>
>Looks like that didn't work either - let me try it again....!!!
>
>
>Subject:
>Re: FE-CE data path
>From:
>"Furquan A. Ansari" <furquan@lucent.com>
>Date:
>Wed, 16 Mar 2005 14:08:52 -0500
>To:
>FORCES@PEACH.EASE.LSOFT.COM
>
>Ok.... I tried sending this long time back - but looks like something
>happened and hasn't been received by the list.
>So, here goes - again.....
>
>----
>Yes, good point indeed, Joel. I misinterpreted your question regarding
>"what
>interface they arrive on" to mean at the CE (de-mux diff tunnel
>interfaces).
>And, no  Hormuzd, I am not advocating having one tunnel per external FE
>interface - that would be a pretty foolish thing to do. There will be a
>single interface from an FE to a CE.
>
>As a matter of fact, I have the CE/FE combination running as a normal
>router
>- with OSPF etc. and should have looked at my own implementation more
>carefully. One would indeed require/need the arriving interface
>information
>- e.g.  if the packet is destined to a multicast address like OSPF
>packets
>(for unicast, one can derive it from the destination address). Having
>said
>that, the discussion of appending/providing some information to obtain
>this
>result (intf info)  is different from needing a transport layer
>protocol.
>There's nothing preventing one from still using a tunnel with the
>information added - e.g. as Jamal pointed out in the VLAN example.
>
>My motivation for tunnelling is to allow a packet to be forwarded at
>wire-speed (ASICs) without it seeing the light of day at the processor
>of
>the FE.  However, if some additional header/tag requires it to be pulled
>out
>anyway, the performace advantages may not be that significant.
>
>
>On a side note - I should have brought out this question long time back
>with
>respect to the protocol draft (headers) but ended up simply using my own
>propietary mechanism to ship the interface arrival information. The
>current
>redirect header (PL header) does not contain any place on the header to
>provide such information at all.
>
>Thanks,
>
>
>Khosravi, Hormuzd M wrote:
>
>Good point, Joel. This is one of the reasons we would need a some/PL
>header for data packets.
>
>I am not sure this would be solved with tunnels, unless you setup a
>tunnel per external FE interface and that could be several hundred
>tunnels if there are as many interfaces on the router.
>You need this information (on which port/interface a packet arrived on
>the FE), for multicast forwarding.
>
>regards
>Hormuzd
>
>-----Original Message-----
>From: Forwarding and Control Element Separation
>[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern
>
>
>
>5) I am essentially saying that in some sense the TML header is the
>
>
>tunnel
>
>
>protocol header. I really don't see
>the need for the "data" packets to be going through the ForCES PL layer
>
>
>
>
>
>for de-muxing to appropriate application (OSPF, BGP etc.) - Put it
>
>
>another
>
>
>way, I am basically saying that there is no PL or TML header for the
>
>
>data
>
>
>packets - since tunneling will be transparent to the applications.
>
>
>
>The data packets need some sort of header since we must know what
>interface
>they arrived on, what FE sent them to the CE, and why the CE sent
>them.  That information can not reliably be determined purely from the
>underlying packet.
>
>Yours,
>Joel M. Halpern


2005
Message-Id: <WED.16.MAR.2005.151111.0500.>
Date: Wed, 16 Mar 2005 15:11:11 -0500
From: Furquan Ansari <furquan@LUCENT.COM>
Subject: Re: FE-CE data path

Hmm...Not sure if there is a problem with the list server of my outgoing
email - my mails to this list are not going. This is the 4th time I am
trying, but this time posting it directly using the web interface!
Hope it works...

-----------

Looks like that didn't work either - let me try it again....!!!


Subject:
Re: FE-CE data path
From:
"Furquan A. Ansari" <furquan@lucent.com>
Date:
Wed, 16 Mar 2005 14:08:52 -0500
To:
FORCES@PEACH.EASE.LSOFT.COM

Ok.... I tried sending this long time back - but looks like something
happened and hasn't been received by the list.
So, here goes - again.....

----
Yes, good point indeed, Joel. I misinterpreted your question regarding "what
interface they arrive on" to mean at the CE (de-mux diff tunnel interfaces).
And, no  Hormuzd, I am not advocating having one tunnel per external FE
interface - that would be a pretty foolish thing to do. There will be a
single interface from an FE to a CE.

As a matter of fact, I have the CE/FE combination running as a normal router
- with OSPF etc. and should have looked at my own implementation more
carefully. One would indeed require/need the arriving interface information
- e.g.  if the packet is destined to a multicast address like OSPF packets
(for unicast, one can derive it from the destination address). Having said
that, the discussion of appending/providing some information to obtain this
result (intf info)  is different from needing a transport layer protocol.
There's nothing preventing one from still using a tunnel with the
information added - e.g. as Jamal pointed out in the VLAN example.

My motivation for tunnelling is to allow a packet to be forwarded at
wire-speed (ASICs) without it seeing the light of day at the processor of
the FE.  However, if some additional header/tag requires it to be pulled out
anyway, the performace advantages may not be that significant.


On a side note - I should have brought out this question long time back with
respect to the protocol draft (headers) but ended up simply using my own
propietary mechanism to ship the interface arrival information. The current
redirect header (PL header) does not contain any place on the header to
provide such information at all.

Thanks,


Khosravi, Hormuzd M wrote:

Good point, Joel. This is one of the reasons we would need a some/PL
header for data packets.

I am not sure this would be solved with tunnels, unless you setup a
tunnel per external FE interface and that could be several hundred
tunnels if there are as many interfaces on the router.
You need this information (on which port/interface a packet arrived on
the FE), for multicast forwarding.

regards
Hormuzd

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern



5) I am essentially saying that in some sense the TML header is the


tunnel


protocol header. I really don't see
the need for the "data" packets to be going through the ForCES PL layer





for de-muxing to appropriate application (OSPF, BGP etc.) - Put it


another


way, I am basically saying that there is no PL or TML header for the


data


packets - since tunneling will be transparent to the applications.



The data packets need some sort of header since we must know what
interface
they arrived on, what FE sent them to the CE, and why the CE sent
them.  That information can not reliably be determined purely from the
underlying packet.

Yours,
Joel M. Halpern


2005
Message-Id: <WED.16.MAR.2005.142419.0800.>
Date: Wed, 16 Mar 2005 14:24:19 -0800
From: "Chawla, Shuchi" <shuchi.chawla@intel.com>
Subject: Re: FE-CE data path
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Thanks for the information, Joel.  Just to confirm that I have
understood what you have said:

- An LFB instance would need to exist on the FE to do the required
protocol processing (in the example below, the SAAL LFB).  The CE would
be made aware of this FE capability via a capability query.
- An LFB on the FE would need to process "data" packets associated with
control processing and make a determination as to whether they should be
sent to the CE (via some protocol), or to an LFB (in the example below,
SAAL LFB) on the FE itself for further processing.

Is that correct?

Given the above, it seems that there is some amount of processing
occurring on these packets in the FE, due to which, I'm wondering if we
can really do wire-speed processing/tunneling of these packets at the
FE?  Am I missing something?

Thanks,
Shuchi


-----Original Message-----
From: Joel M. Halpern [mailto:joel@stevecrocker.com]=20
Sent: Wednesday, March 16, 2005 1:28 PM
To: Chawla, Shuchi; FORCES@PEACH.EASE.LSOFT.COM
Subject: Re: FE-CE data path

This kind of distirbution can be done.
In fact, if the FE has capabilities to help the CE, the CE can make use
of=20
those at it sees fit.

There are two aspects to this, both related to LFB topology.

Firstly, there is the matter of how the FE will decide to send data
packets=20
to the CE.  I expect that this will be represented by an instance of an
LFB=20
class representing the data channel itnerface.  Thus, the LFB topology
and=20
classifiers therein can be arranged to select traffic according to
whatever=20
conditions are interesting (including errors, etc) and direct that
traffic=20
to the LFB instance which will send it to the CE.  Similarly, this LFB=20
instance can also be used as a packet source for data packets from the=20
CE.  The topology configuration will determine what the FE does with
such=20
packets.

Secondly, one can have LFB classes (and instances of those classes) to=20
represent capabilities provided by the processor on the FE.  (In some=20
implementations, all LFBs are provided by softwware on the FE.)  So if
we=20
want to represent an SAAL processor on the FE, we will need an LFB class

definition for the capability.  Then, a CE working with an FE which=20
supports that LFB class can choose to make use of it.

Yours,
Joel M. Halpern

At 04:17 PM 3/16/2005, Chawla, Shuchi wrote:
>I have a slightly tangential comment/question to all of this which may
>impact the FE-CE data channel discussion -- I'm not sure.  Anyway, here
>is it:
>
>I believe there are instances where some part of the control protocol
>processing may be distributed between the FE and the CE; in effect, a
>part (maybe the lower layers) of the protocol processing may be done on
>the FE, and a part of it on the CE.  As an example, I am familiar with
>an ATM switch I was involved in, that did SAAL processing on the FE and
>Q.2931 processing on the CE, thus distributing the processing of ATM
>signaling between the FEs and the CE.  The FEs had adequate processing
>capability in this case and this also reduced the burden on the CE of
>doing SAAL processing for a large number of FEs/interfaces.
>
>The above are protocols associated with the data channel.  Given that
>the current model is for the packets associated with the data channel
to
>be transported to the CE (either via a tunnel or using a transport
>protocol etc. based on the decision reached), I'm wondering how such a
>distributed control processing model might fit into the overall
>framework.  In the example above, the SAAL messages would need to be
>terminated on the FE, whereas the Q.2931 messages would need to be
>transported to the CE.  This might imply some sort of inspection of the
>data packets themselves, I assume.
>
>Maybe this has been addressed in earlier discussions; if so, could you
>please point me to the relevant information?
>
>Regards,
>Shuchi
>
>-----Original Message-----
>From: Forwarding and Control Element Separation
>[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Furquan Ansari
>Sent: Wednesday, March 16, 2005 12:11 PM
>To: FORCES@PEACH.EASE.LSOFT.COM
>Subject: Re: FE-CE data path
>
>Hmm...Not sure if there is a problem with the list server of my
outgoing
>email - my mails to this list are not going. This is the 4th time I am
>trying, but this time posting it directly using the web interface!
>Hope it works...
>
>-----------
>
>Looks like that didn't work either - let me try it again....!!!
>
>
>Subject:
>Re: FE-CE data path
>From:
>"Furquan A. Ansari" <furquan@lucent.com>
>Date:
>Wed, 16 Mar 2005 14:08:52 -0500
>To:
>FORCES@PEACH.EASE.LSOFT.COM
>
>Ok.... I tried sending this long time back - but looks like something
>happened and hasn't been received by the list.
>So, here goes - again.....
>
>----
>Yes, good point indeed, Joel. I misinterpreted your question regarding
>"what
>interface they arrive on" to mean at the CE (de-mux diff tunnel
>interfaces).
>And, no  Hormuzd, I am not advocating having one tunnel per external FE
>interface - that would be a pretty foolish thing to do. There will be a
>single interface from an FE to a CE.
>
>As a matter of fact, I have the CE/FE combination running as a normal
>router
>- with OSPF etc. and should have looked at my own implementation more
>carefully. One would indeed require/need the arriving interface
>information
>- e.g.  if the packet is destined to a multicast address like OSPF
>packets
>(for unicast, one can derive it from the destination address). Having
>said
>that, the discussion of appending/providing some information to obtain
>this
>result (intf info)  is different from needing a transport layer
>protocol.
>There's nothing preventing one from still using a tunnel with the
>information added - e.g. as Jamal pointed out in the VLAN example.
>
>My motivation for tunnelling is to allow a packet to be forwarded at
>wire-speed (ASICs) without it seeing the light of day at the processor
>of
>the FE.  However, if some additional header/tag requires it to be
pulled
>out
>anyway, the performace advantages may not be that significant.
>
>
>On a side note - I should have brought out this question long time back
>with
>respect to the protocol draft (headers) but ended up simply using my
own
>propietary mechanism to ship the interface arrival information. The
>current
>redirect header (PL header) does not contain any place on the header to
>provide such information at all.
>
>Thanks,
>
>
>Khosravi, Hormuzd M wrote:
>
>Good point, Joel. This is one of the reasons we would need a some/PL
>header for data packets.
>
>I am not sure this would be solved with tunnels, unless you setup a
>tunnel per external FE interface and that could be several hundred
>tunnels if there are as many interfaces on the router.
>You need this information (on which port/interface a packet arrived on
>the FE), for multicast forwarding.
>
>regards
>Hormuzd
>
>-----Original Message-----
>From: Forwarding and Control Element Separation
>[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern
>
>
>
>5) I am essentially saying that in some sense the TML header is the
>
>
>tunnel
>
>
>protocol header. I really don't see
>the need for the "data" packets to be going through the ForCES PL layer
>
>
>
>
>
>for de-muxing to appropriate application (OSPF, BGP etc.) - Put it
>
>
>another
>
>
>way, I am basically saying that there is no PL or TML header for the
>
>
>data
>
>
>packets - since tunneling will be transparent to the applications.
>
>
>
>The data packets need some sort of header since we must know what
>interface
>they arrived on, what FE sent them to the CE, and why the CE sent
>them.  That information can not reliably be determined purely from the
>underlying packet.
>
>Yours,
>Joel M. Halpern


2005
Message-Id: <WED.16.MAR.2005.131737.0800.>
Date: Wed, 16 Mar 2005 13:17:37 -0800
From: "Chawla, Shuchi" <shuchi.chawla@intel.com>
Subject: Re: FE-CE data path
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

I have a slightly tangential comment/question to all of this which may
impact the FE-CE data channel discussion -- I'm not sure.  Anyway, here
is it:=20

I believe there are instances where some part of the control protocol
processing may be distributed between the FE and the CE; in effect, a
part (maybe the lower layers) of the protocol processing may be done on
the FE, and a part of it on the CE.  As an example, I am familiar with
an ATM switch I was involved in, that did SAAL processing on the FE and
Q.2931 processing on the CE, thus distributing the processing of ATM
signaling between the FEs and the CE.  The FEs had adequate processing
capability in this case and this also reduced the burden on the CE of
doing SAAL processing for a large number of FEs/interfaces.

The above are protocols associated with the data channel.  Given that
the current model is for the packets associated with the data channel to
be transported to the CE (either via a tunnel or using a transport
protocol etc. based on the decision reached), I'm wondering how such a
distributed control processing model might fit into the overall
framework.  In the example above, the SAAL messages would need to be
terminated on the FE, whereas the Q.2931 messages would need to be
transported to the CE.  This might imply some sort of inspection of the
data packets themselves, I assume.

Maybe this has been addressed in earlier discussions; if so, could you
please point me to the relevant information?

Regards,
Shuchi=20

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Furquan Ansari
Sent: Wednesday, March 16, 2005 12:11 PM
To: FORCES@PEACH.EASE.LSOFT.COM
Subject: Re: FE-CE data path

Hmm...Not sure if there is a problem with the list server of my outgoing
email - my mails to this list are not going. This is the 4th time I am
trying, but this time posting it directly using the web interface!
Hope it works...

-----------

Looks like that didn't work either - let me try it again....!!!


Subject:
Re: FE-CE data path
From:
"Furquan A. Ansari" <furquan@lucent.com>
Date:
Wed, 16 Mar 2005 14:08:52 -0500
To:
FORCES@PEACH.EASE.LSOFT.COM

Ok.... I tried sending this long time back - but looks like something
happened and hasn't been received by the list.
So, here goes - again.....

----
Yes, good point indeed, Joel. I misinterpreted your question regarding
"what
interface they arrive on" to mean at the CE (de-mux diff tunnel
interfaces).
And, no  Hormuzd, I am not advocating having one tunnel per external FE
interface - that would be a pretty foolish thing to do. There will be a
single interface from an FE to a CE.

As a matter of fact, I have the CE/FE combination running as a normal
router
- with OSPF etc. and should have looked at my own implementation more
carefully. One would indeed require/need the arriving interface
information
- e.g.  if the packet is destined to a multicast address like OSPF
packets
(for unicast, one can derive it from the destination address). Having
said
that, the discussion of appending/providing some information to obtain
this
result (intf info)  is different from needing a transport layer
protocol.
There's nothing preventing one from still using a tunnel with the
information added - e.g. as Jamal pointed out in the VLAN example.

My motivation for tunnelling is to allow a packet to be forwarded at
wire-speed (ASICs) without it seeing the light of day at the processor
of
the FE.  However, if some additional header/tag requires it to be pulled
out
anyway, the performace advantages may not be that significant.


On a side note - I should have brought out this question long time back
with
respect to the protocol draft (headers) but ended up simply using my own
propietary mechanism to ship the interface arrival information. The
current
redirect header (PL header) does not contain any place on the header to
provide such information at all.

Thanks,


Khosravi, Hormuzd M wrote:

Good point, Joel. This is one of the reasons we would need a some/PL
header for data packets.

I am not sure this would be solved with tunnels, unless you setup a
tunnel per external FE interface and that could be several hundred
tunnels if there are as many interfaces on the router.
You need this information (on which port/interface a packet arrived on
the FE), for multicast forwarding.

regards
Hormuzd

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern



5) I am essentially saying that in some sense the TML header is the


tunnel


protocol header. I really don't see
the need for the "data" packets to be going through the ForCES PL layer





for de-muxing to appropriate application (OSPF, BGP etc.) - Put it


another


way, I am basically saying that there is no PL or TML header for the


data


packets - since tunneling will be transparent to the applications.



The data packets need some sort of header since we must know what
interface
they arrived on, what FE sent them to the CE, and why the CE sent
them.  That information can not reliably be determined purely from the
underlying packet.

Yours,
Joel M. Halpern


2005
Message-Id: <WED.16.MAR.2005.124303.0800.>
Date: Wed, 16 Mar 2005 12:43:03 -0800
From: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
Subject: Re: FE-CE data path
Comments: To: Furquan Ansari <furquan@LUCENT.COM>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Furquan,

Just saw your email. To answer your question, this information is in the
Redirect message, not the common header. Specifically, it would be
conveyed by the LFB ID, since LFBs will represent the ports. See section
6.8 for more details.

Hope my message will post soon. We have had problems with the mailserver
in the past...it a good sign...shows the mailing list is busy :-))

regards
Hormuzd

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Furquan Ansari
Sent: Wednesday, March 16, 2005 12:11 PM
To: FORCES@PEACH.EASE.LSOFT.COM
Subject: Re: [FORCES] FE-CE data path

Yes, good point indeed, Joel. I misinterpreted your question regarding
"what
interface they arrive on" to mean at the CE (de-mux diff tunnel
interfaces).
And, no  Hormuzd, I am not advocating having one tunnel per external FE
interface - that would be a pretty foolish thing to do. There will be a
single interface from an FE to a CE.

As a matter of fact, I have the CE/FE combination running as a normal
router
- with OSPF etc. and should have looked at my own implementation more
carefully. One would indeed require/need the arriving interface
information
- e.g.  if the packet is destined to a multicast address like OSPF
packets
(for unicast, one can derive it from the destination address). Having
said
that, the discussion of appending/providing some information to obtain
this
result (intf info)  is different from needing a transport layer
protocol.
There's nothing preventing one from still using a tunnel with the
information added - e.g. as Jamal pointed out in the VLAN example.

My motivation for tunnelling is to allow a packet to be forwarded at
wire-speed (ASICs) without it seeing the light of day at the processor
of
the FE.  However, if some additional header/tag requires it to be pulled
out
anyway, the performace advantages may not be that significant.


On a side note - I should have brought out this question long time back
with
respect to the protocol draft (headers) but ended up simply using my own
propietary mechanism to ship the interface arrival information. The
current
redirect header (PL header) does not contain any place on the header to
provide such information at all.

Thanks,


Khosravi, Hormuzd M wrote:

Good point, Joel. This is one of the reasons we would need a some/PL
header for data packets.

I am not sure this would be solved with tunnels, unless you setup a
tunnel per external FE interface and that could be several hundred
tunnels if there are as many interfaces on the router.
You need this information (on which port/interface a packet arrived on
the FE), for multicast forwarding.

regards
Hormuzd

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern



5) I am essentially saying that in some sense the TML header is the


tunnel


protocol header. I really don't see
the need for the "data" packets to be going through the ForCES PL layer





for de-muxing to appropriate application (OSPF, BGP etc.) - Put it


another


way, I am basically saying that there is no PL or TML header for the


data


packets - since tunneling will be transparent to the applications.



The data packets need some sort of header since we must know what
interface
they arrived on, what FE sent them to the CE, and why the CE sent
them.  That information can not reliably be determined purely from the
underlying packet.

Yours,
Joel M. Halpern


2005
Message-Id: <WED.16.MAR.2005.104931.0500.>
Date: Wed, 16 Mar 2005 10:49:31 -0500
From: Tolga Asveren <asveren@ulticom.com>
Subject: Re: FE-CE data path
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

a correction:

redundancy should read reliability below....

> -----Original Message-----
> From: Forwarding and Control Element Separation
> [mailto:FORCES@PEACH.EASE.LSOFT.COM]On Behalf Of Tolga Asveren
> Sent: Wednesday, March 16, 2005 10:37 AM
> To: FORCES@PEACH.EASE.LSOFT.COM
> Subject: Re: FE-CE data path
>
>
> Just 2 cents from an outsider:
>
> -Considering Fast Retransmit mechanism, will HOL a real issue
> even for TCP,
> for FE-CE communication -hopefully they don't communicate over big-I
> Internet :-)-?
>
> -Related with a former comment questioning the importance of computation
> associated with connection oriented protocols with redundancy, e.g. TCP,
> SCTP: People might want to use FORCES to build things except routers, and
> for certain cases the computation associated with redundancy might matter.
>
>    Tolga
>
> > -----Original Message-----
> > From: Forwarding and Control Element Separation
> > [mailto:FORCES@PEACH.EASE.LSOFT.COM]On Behalf Of Jamal Hadi Salim
> > Sent: Tuesday, March 15, 2005 8:23 PM
> > To: FORCES@PEACH.EASE.LSOFT.COM
> > Subject: Re: FE-CE data path
> >
> >
> > True SCTP isnt as widely deployed as say TCP or UDP;
> > I dont think SCTP has the same technical problems as TCP as i was
> > pointing out earlier if you use SCTP-PR.
> >
> > cheers,
> > jamal
> >
> > On Tue, 2005-03-15 at 20:08, Deleganes, Ellen M wrote:
> > > Even if there are good and stable DCCP implementations soon, this
> > > doesn't mean it will become production soon. Won't that be an issue?
> > > Even SCTP isn't all that widely deployed and it still has some of the
> > > technical problems people were raising regarding TCP.
> > >
> > > Regards,
> > > Ellen


2005
Message-Id: <WED.16.MAR.2005.103727.0500.>
Date: Wed, 16 Mar 2005 10:37:27 -0500
From: Tolga Asveren <asveren@ulticom.com>
Subject: Re: FE-CE data path
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

Just 2 cents from an outsider:

-Considering Fast Retransmit mechanism, will HOL a real issue even for TCP,
for FE-CE communication -hopefully they don't communicate over big-I
Internet :-)-?

-Related with a former comment questioning the importance of computation
associated with connection oriented protocols with redundancy, e.g. TCP,
SCTP: People might want to use FORCES to build things except routers, and
for certain cases the computation associated with redundancy might matter.

   Tolga

> -----Original Message-----
> From: Forwarding and Control Element Separation
> [mailto:FORCES@PEACH.EASE.LSOFT.COM]On Behalf Of Jamal Hadi Salim
> Sent: Tuesday, March 15, 2005 8:23 PM
> To: FORCES@PEACH.EASE.LSOFT.COM
> Subject: Re: FE-CE data path
>
>
> True SCTP isnt as widely deployed as say TCP or UDP;
> I dont think SCTP has the same technical problems as TCP as i was
> pointing out earlier if you use SCTP-PR.
>
> cheers,
> jamal
>
> On Tue, 2005-03-15 at 20:08, Deleganes, Ellen M wrote:
> > Even if there are good and stable DCCP implementations soon, this
> > doesn't mean it will become production soon. Won't that be an issue?
> > Even SCTP isn't all that widely deployed and it still has some of the
> > technical problems people were raising regarding TCP.
> >
> > Regards,
> > Ellen


2005
Message-Id: <WED.16.MAR.2005.091718.0800.>
Date: Wed, 16 Mar 2005 09:17:18 -0800
From: "Putzolu, David" <david.putzolu@intel.com>
Subject: Re: FE-CE data path
Comments: To: Tolga Asveren <asveren@ulticom.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Hi Tolga.

I agree on the fast retransmit case.  The latencies involved
in a CE-FE connection are probably pretty small.

In regards to the computational cost of TCP vs. the computational
cost of the CE/FE processing the data itself,  can you provide
some examples?  Most of the L2, L3, and L4+ protocols I can think
of require at least an order of magnitude more processing for
the data than for transporting the data in TCP.  Off the top
of my head:

SNMP: Encoding alone is probably 2+ orders > TCP
Telnet: String processing at least 1+ order
SSH: Encryption at least 1+ order of magnitude
Routing protocols: SPF calculations will be 2+
Simple lookup protocols: 1+ order for validating and updating
  things like DHCP or ARP
Firewall rule manipulation: 1-2 orders of magnitude
  to validate and cook a new ACL entry

Of course, all of the above computation occurs on the CE.  Each
FE would have to pay the price of the TCP encap on its relatively
limited processor.  However, if a FE has the CPU horsepower to
parse the ForCES PL then it still feels to me like TCP is
trivial.

-David (hat off as usual)


-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Tolga Asveren
Sent: Wednesday, March 16, 2005 7:37 AM
To: FORCES@PEACH.EASE.LSOFT.COM
Subject: Re: [FORCES] FE-CE data path

Just 2 cents from an outsider:

-Considering Fast Retransmit mechanism, will HOL a real issue even for
TCP,
for FE-CE communication -hopefully they don't communicate over big-I
Internet :-)-?

-Related with a former comment questioning the importance of computation
associated with connection oriented protocols with redundancy, e.g. TCP,
SCTP: People might want to use FORCES to build things except routers,
and
for certain cases the computation associated with redundancy might
matter.

   Tolga

> -----Original Message-----
> From: Forwarding and Control Element Separation
> [mailto:FORCES@PEACH.EASE.LSOFT.COM]On Behalf Of Jamal Hadi Salim
> Sent: Tuesday, March 15, 2005 8:23 PM
> To: FORCES@PEACH.EASE.LSOFT.COM
> Subject: Re: FE-CE data path
>
>
> True SCTP isnt as widely deployed as say TCP or UDP;
> I dont think SCTP has the same technical problems as TCP as i was
> pointing out earlier if you use SCTP-PR.
>
> cheers,
> jamal
>
> On Tue, 2005-03-15 at 20:08, Deleganes, Ellen M wrote:
> > Even if there are good and stable DCCP implementations soon, this
> > doesn't mean it will become production soon. Won't that be an issue?
> > Even SCTP isn't all that widely deployed and it still has some of
the
> > technical problems people were raising regarding TCP.
> >
> > Regards,
> > Ellen


2005
Message-Id: <TUE.15.MAR.2005.202247.0500.>
Date: Tue, 15 Mar 2005 20:22:47 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: ZNYX Networks
Subject: Re: FE-CE data path
Comments: To: Ellen M Deleganes <ellen.m.deleganes@intel.com>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

True SCTP isnt as widely deployed as say TCP or UDP;
I dont think SCTP has the same technical problems as TCP as i was
pointing out earlier if you use SCTP-PR.

cheers,
jamal

On Tue, 2005-03-15 at 20:08, Deleganes, Ellen M wrote:
> Even if there are good and stable DCCP implementations soon, this
> doesn't mean it will become production soon. Won't that be an issue?
> Even SCTP isn't all that widely deployed and it still has some of the
> technical problems people were raising regarding TCP.
>
> Regards,
> Ellen


2005
Message-Id: <TUE.15.MAR.2005.201017.0500.>
Date: Tue, 15 Mar 2005 20:10:17 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: ZNYX Networks
Subject: Re: FE-CE data path
Comments: To: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
Comments: cc: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

Well, Arnaldo has a paper due on DCCP in a linux conference in July.
He should have the code fleshed out well by then; he better!
[CCing him]

But even if you use this code now i.e you wont see crashes; i at least
have that much confidence in Arnaldo ;-> and if you do find it crashes a
bug report to him if he is online would find a resolution in a few
minutes.

I would suggest trying it out - thats the only way he can improve it.

Like i said earlier, there may be rough edges in the spec conformance
until it is well tested.

cheers,
jamal

On Tue, 2005-03-15 at 19:53, Khosravi, Hormuzd M wrote:
> Yes, I am not holding my breath for this either. I tested a few DCCP
> implementations before and none were stable. They caused a kernel panic
> as soon as I ran a few tests. I do hope, just as you that we find some
> good stable DCCP implementations soon.
>
> Are there any timelines set by the Linux community to support DCCP in
> the standard kernel release ? If not, would you have an idea of
> approximately how far out this might be?
>
>
> Thanks
> Hormuzd
>
> -----Original Message-----
> From: Forwarding and Control Element Separation
> [mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Jamal Hadi Salim
> Sent: Tuesday, March 15, 2005 4:46 PM
> To: FORCES@PEACH.EASE.LSOFT.COM
> Subject: Re: [FORCES] FE-CE data path
>
> I should know  a little more about the subject because I got Arnaldo
> started on Linux DCCP. I havent looked at the code in sometime, but:
> I doubt very much i would want to deploy that code with any product i am
> responsible for. Mostly because it hasnt been really tested probably by
> anyone other than Arnaldo - or deployed for that matter . I am pretty
> sure full of spec misconduct as a result of the above. I think in due
> time it will be ready - but i wouldnt use this as a reason to say DCCP
> is ready.
>
> cheers,
> jamal
>
>
> On Tue, 2005-03-15 at 18:23, Khosravi, Hormuzd M wrote:
> > Joel,
> >
> > I agree in spirit with what your proposing regarding using DCCP for
> the
> > data channel and we have mentioned it in the draft as well.
> >
> > Regarding implementation, here is the latest info that I got from the
> > DCCP WG couple of days back...
> >
> > -----Original Message-----
> > From: dccp-bounces@ietf.org [mailto:dccp-bounces@ietf.org] On Behalf
> Of
> > Naadir Jeewa
> > Sent: Monday, March 14, 2005 12:09 PM
> > To: dccp@ietf.org
> > Subject: Re: [dccp] Any dccp implementations compliant with the latest
> > specs ?
> >
> > Arnaldo Mela @ Conectiva, and I have been working independently on
> such
> > an implementation. Mines not very good, so I'll probably on Arnaldo's
> > code base from now on.
> > I need to extract it out of the main BitKeeper tree into a separable
> > module. I'll do that by the end of the week and stick it on CVS at
> > www.sf.net/projects/linux-dccp once I've done some exams on Wednesday.
> > CCID and feature handling need to be added, and a good way of
> > implementing those CCIDs needs to be decided upon - perhaps something
> > similar to Stephen Hemminger's forthcoming patch to the TCP congestion
> > control mechanisms
> > ( http://marc.theaimsgroup.com/?l=linux-net&m=110920482303293&w=2 ).
> >
> > Yours,
> > Naadir
> >
> > On Mon, 2005-03-14 at 11:51 -0800, Khosravi, Hormuzd M wrote:
> > > I was wondering if there are any DCCP implementations for Linux
> Kernel
> > > compliant with the latest DCCP specs going for RFC ? If no, are
> there
> > > any such efforts in play ?
> > >
> > >
> > > Thanks
> > > Hormuzd
> > > P.s. I had checked on this sometime last year, hopefully things have
> > > progressed on this now.
> >
> > --------------------
> >
> > I haven't looked at this in more detail. But the previous
> > implementations that I looked at were not promising at all. If you
> have
> > any thoughts on this "no running code" issue, let me know?
> >
> > Thanks
> > Hormuzd
> >
> > -----Original Message-----
> > From: Forwarding and Control Element Separation
> > [mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern
> > Sent: Tuesday, March 15, 2005 2:03 PM
> > To: FORCES@PEACH.EASE.LSOFT.COM
> > Subject: Re: [FORCES] FE-CE data path
> >
> > I have a basic problem with this.  We are trying to design a
> congestion
> > controlling datagram transfer protocol.  We are not the right place to
> > do
> > that.  Congestion control is known to be very tricky, and obvious
> > answers
> > often have very non-obvious implications.  (Just getting the delay
> > bounded
> > DiffServ stuff to work right took some interesting effort, and I had
> > some
> > very good folks to work with.)
> >
> > it is possible that DCCP is too complex, but there is really no
> > difference
> > between an encapsulation driver (GRE) and a small protocol stack (DCCP
> I
> > hope.)
> >
> > I will endeavor in the near future to take a good look at the DCCP
> > documents to see what they really give us and what it will take to use
>
> > it.  (The last protocol I wanted to use did not have the capabilities
> I
> > was
> > looking for.)
> >
> > If DCCP is not usable, we are in for a lot of very tricky work to get
> > congestion control right, particularly since we need it to interact
> > properly with TCP on the same link.
> >
> > Yours,
> > Joel


2005
Message-Id: <TUE.15.MAR.2005.194621.0500.>
Date: Tue, 15 Mar 2005 19:46:21 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: ZNYX Networks
Subject: Re: FE-CE data path
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

I should know  a little more about the subject because I got Arnaldo
started on Linux DCCP. I havent looked at the code in sometime, but:
I doubt very much i would want to deploy that code with any product i am
responsible for. Mostly because it hasnt been really tested probably by
anyone other than Arnaldo - or deployed for that matter . I am pretty
sure full of spec misconduct as a result of the above. I think in due
time it will be ready - but i wouldnt use this as a reason to say DCCP
is ready.

cheers,
jamal


On Tue, 2005-03-15 at 18:23, Khosravi, Hormuzd M wrote:
> Joel,
>
> I agree in spirit with what your proposing regarding using DCCP for the
> data channel and we have mentioned it in the draft as well.
>
> Regarding implementation, here is the latest info that I got from the
> DCCP WG couple of days back...
>
> -----Original Message-----
> From: dccp-bounces@ietf.org [mailto:dccp-bounces@ietf.org] On Behalf Of
> Naadir Jeewa
> Sent: Monday, March 14, 2005 12:09 PM
> To: dccp@ietf.org
> Subject: Re: [dccp] Any dccp implementations compliant with the latest
> specs ?
>
> Arnaldo Mela @ Conectiva, and I have been working independently on such
> an implementation. Mines not very good, so I'll probably on Arnaldo's
> code base from now on.
> I need to extract it out of the main BitKeeper tree into a separable
> module. I'll do that by the end of the week and stick it on CVS at
> www.sf.net/projects/linux-dccp once I've done some exams on Wednesday.
> CCID and feature handling need to be added, and a good way of
> implementing those CCIDs needs to be decided upon - perhaps something
> similar to Stephen Hemminger's forthcoming patch to the TCP congestion
> control mechanisms
> ( http://marc.theaimsgroup.com/?l=linux-net&m=110920482303293&w=2 ).
>
> Yours,
> Naadir
>
> On Mon, 2005-03-14 at 11:51 -0800, Khosravi, Hormuzd M wrote:
> > I was wondering if there are any DCCP implementations for Linux Kernel
> > compliant with the latest DCCP specs going for RFC ? If no, are there
> > any such efforts in play ?
> >
> >
> > Thanks
> > Hormuzd
> > P.s. I had checked on this sometime last year, hopefully things have
> > progressed on this now.
>
> --------------------
>
> I haven't looked at this in more detail. But the previous
> implementations that I looked at were not promising at all. If you have
> any thoughts on this "no running code" issue, let me know?
>
> Thanks
> Hormuzd
>
> -----Original Message-----
> From: Forwarding and Control Element Separation
> [mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern
> Sent: Tuesday, March 15, 2005 2:03 PM
> To: FORCES@PEACH.EASE.LSOFT.COM
> Subject: Re: [FORCES] FE-CE data path
>
> I have a basic problem with this.  We are trying to design a congestion
> controlling datagram transfer protocol.  We are not the right place to
> do
> that.  Congestion control is known to be very tricky, and obvious
> answers
> often have very non-obvious implications.  (Just getting the delay
> bounded
> DiffServ stuff to work right took some interesting effort, and I had
> some
> very good folks to work with.)
>
> it is possible that DCCP is too complex, but there is really no
> difference
> between an encapsulation driver (GRE) and a small protocol stack (DCCP I
> hope.)
>
> I will endeavor in the near future to take a good look at the DCCP
> documents to see what they really give us and what it will take to use
> it.  (The last protocol I wanted to use did not have the capabilities I
> was
> looking for.)
>
> If DCCP is not usable, we are in for a lot of very tricky work to get
> congestion control right, particularly since we need it to interact
> properly with TCP on the same link.
>
> Yours,
> Joel


2005
Message-Id: <TUE.15.MAR.2005.175845.0500.>
Date: Tue, 15 Mar 2005 17:58:45 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: FE-CE data path
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

Actually, rate limiting will. in general, not do what we want.
Suppose that we have several cards, each limitted to a certain rate (over
time).
1) In order to support many cards, we would have to set that rate limit per
card very low.  (Large numbers of FEs is a stated design target.)
2) If there is very little "data" traffic, TCP will have crept up very
nicely.  If you then slam the link hard with the first couple of packets
from many sources (such synchrony can and does happen in the real world)
you will cause TCP too back off really hard.  It will take a long time to
recover.

These are just two examples.  And I am not an expert on congestion control
and the complexities thereof.  This is very tricky, very subtle, stuff.

Yours,
Joel M. Halpern

PS: Let me phrase this differently.  I would not want to be the chairs who
had to explain to the IESG that we chose to invent a whole new congestion
control mechanism.  It would be very unpleasant.

At 05:35 PM 3/15/2005, Furquan A. Ansari wrote:
>Joel,
>    You probably mistook my example as a design/need for a congestion
> controlling datagram transfer protocol - not true. I was just pointing
> out that the case of rate limiting the data channel is sufficient to
> achieve our objectives - that the control channel packets can be
> communicated during transient overload conditions. The case where you
> have individual interfaces from FE to CE, it is very trivial - clamp the
> high threshold to some percentage for data traffic (e.g. 90%). In the
> case where you end up sharing the interconnect with multiple FEs, exactly
> the same mechanism would suffice as long as the aggregated uplink
> capacity is greater than or equal to the sum of indivual capacities. If
> someone is foolish enough to have an uplink that is of same capacity as
> other (access) links - then you can potentially have congestion and the
> solution should be that he/she should upgrade the link. We don't need a
> specific congestion control "transport" protocol to achieve this.
>
>E.g.
>                                         CE
>                                            |
>                                            |    1G Ethernet
>                                            |
>                                        ---Eth Switch
>                            ---  |        |   -----
>                            |          ---                  |
>                            |                |                    |
>         10 Mbps  |                | 100Mbps |   100Mbps
>                            |                |                    |
>                         FE1         FE2           FE3
>
>
>    You can add/remove more elements to the NE (aggregate up to 1G) and
> use the same policy of rate limiting on the new FE and it would work
> fine. No complexities here.
>
>
>Thanks,
>
>Joel M. Halpern wrote:
>
>>I have a basic problem with this.  We are trying to design a congestion
>>controlling datagram transfer protocol.  We are not the right place to do
>>that.  Congestion control is known to be very tricky, and obvious answers
>>often have very non-obvious implications.
>>(Just getting the delay bounded DiffServ stuff to work right took some
>>interesting effort, and I had some very good folks to work with.)
>>
>>it is possible that DCCP is too complex, but there is really no
>>difference between an encapsulation driver (GRE) and a small protocol
>>stack (DCCP I hope.)
>>
>>I will endeavor in the near future to take a good look at the DCCP
>>documents to see what they really give us and what it will take to use
>>it.  (The last protocol I wanted to use did not have the capabilities I
>>was looking for.)
>>
>>If DCCP is not usable, we are in for a lot of very tricky work to get
>>congestion control right, particularly since we need it to interact
>>properly with TCP on the same link.
>>
>>Yours,
>>Joel
>>
>>At 04:56 PM 3/15/2005, Furquan A. Ansari wrote:
>>
>>>Given that there are multiple FEs (and possibly even multiple NEs)
>>>sharing the interconnect, it is very hard to create the proper
>>>configuration for each FE to rate limit its data traffic.  In fact, if
>>>one assumes that new FEs (and possibly new NEs) can be added to the
>>>interconnect, it is almost impossible to properly set the rate limits.
>>>
>>>[Furquan] Yes, coming up with a right solution for rate limiting when
>>>multiple FEs are sharing an interconnect would be
>>>difficult, but not impossible - we will have to work on it.  Just as an
>>>example, every interface going out of the FE
>>>towards the CE should be rate limited and the aggregation device should
>>>have the uplink capacity that is in fact
>>>the aggregate value of all the FE-CE b/w links.
>>>
>>>                                     CE
>>>                                        |
>>>                                        | B/w=(A+B+C)
>>>                                        |
>>>                    -------------
>>>                    |                    |                |
>>>             A   |              B   |             C|
>>>                    |                    |                |
>>>                    FE1            FE2            FE3
>>>
>>>    B/W capacities between FE1-CE = A, FE2-CE = B, FE3-CE = C
>>>    Rate limited Data channel for FE1 = 0.9A, FE2=0.9B, FE3=0.9C
>>>
>>>    This will always ensure that there is enough capacity for the
>>> control packets between the CE and FEs. I'm
>>>sure there are other mechanisms, but just wanted to point one possible
>>>solution.
>
>--
>Furquan Ansari
>Bell Labs Research                      Ph : 732-949-5249
>Holmdel, NJ                             Fax: 732-949-4556


2005
Message-Id: <TUE.15.MAR.2005.173506.0500.>
Date: Tue, 15 Mar 2005 17:35:06 -0500
From: "Furquan A. Ansari" <furquan@lucent.com>
Organization: Lucent Technologies Inc.
Subject: Re: FE-CE data path
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

Joel,
    You probably mistook my example as a design/need for a congestion
controlling datagram transfer protocol - not true. I was just pointing
out that the case of rate limiting the data channel is sufficient to
achieve our objectives - that the control channel packets can be
communicated during transient overload conditions. The case where you
have individual interfaces from FE to CE, it is very trivial - clamp the
high threshold to some percentage for data traffic (e.g. 90%). In the
case where you end up sharing the interconnect with multiple FEs,
exactly the same mechanism would suffice as long as the aggregated
uplink capacity is greater than or equal to the sum of indivual
capacities. If someone is foolish enough to have an uplink that is of
same capacity as other (access) links - then you can potentially have
congestion and the solution should be that he/she should upgrade the
link. We don't need a specific congestion control "transport" protocol
to achieve this.

E.g.
                                         CE
                                            |
                                            |    1G Ethernet
                                            |
                                        ---Eth Switch
                            ---  |        |   -----
                            |          ---                  |
                            |                |                    |
         10 Mbps  |                | 100Mbps |   100Mbps
                            |                |                    |
                         FE1         FE2           FE3


    You can add/remove more elements to the NE (aggregate up to 1G) and
use the same policy of rate limiting on the new FE and it would work
fine. No complexities here.


Thanks,

Joel M. Halpern wrote:

> I have a basic problem with this.  We are trying to design a
> congestion controlling datagram transfer protocol.  We are not the
> right place to do that.  Congestion control is known to be very
> tricky, and obvious answers often have very non-obvious implications.
> (Just getting the delay bounded DiffServ stuff to work right took some
> interesting effort, and I had some very good folks to work with.)
>
> it is possible that DCCP is too complex, but there is really no
> difference between an encapsulation driver (GRE) and a small protocol
> stack (DCCP I hope.)
>
> I will endeavor in the near future to take a good look at the DCCP
> documents to see what they really give us and what it will take to use
> it.  (The last protocol I wanted to use did not have the capabilities
> I was looking for.)
>
> If DCCP is not usable, we are in for a lot of very tricky work to get
> congestion control right, particularly since we need it to interact
> properly with TCP on the same link.
>
> Yours,
> Joel
>
> At 04:56 PM 3/15/2005, Furquan A. Ansari wrote:
>
>> Given that there are multiple FEs (and possibly even multiple NEs)
>> sharing the interconnect, it is very hard to create the proper
>> configuration for each FE to rate limit its data traffic.  In fact,
>> if one assumes that new FEs (and possibly new NEs) can be added to
>> the interconnect, it is almost impossible to properly set the rate
>> limits.
>>
>> [Furquan] Yes, coming up with a right solution for rate limiting when
>> multiple FEs are sharing an interconnect would be
>> difficult, but not impossible - we will have to work on it.  Just as
>> an example, every interface going out of the FE
>> towards the CE should be rate limited and the aggregation device
>> should have the uplink capacity that is in fact
>> the aggregate value of all the FE-CE b/w links.
>>
>>                                     CE
>>                                        |
>>                                        | B/w=(A+B+C)
>>                                        |
>>                    -------------
>>                    |                    |                |
>>             A   |              B   |             C|
>>                    |                    |                |
>>                    FE1            FE2            FE3
>>
>>    B/W capacities between FE1-CE = A, FE2-CE = B, FE3-CE = C
>>    Rate limited Data channel for FE1 = 0.9A, FE2=0.9B, FE3=0.9C
>>
>>    This will always ensure that there is enough capacity for the
>> control packets between the CE and FEs. I'm
>> sure there are other mechanisms, but just wanted to point one
>> possible solution.
>

--
Furquan Ansari
Bell Labs Research			Ph : 732-949-5249
Holmdel, NJ				Fax: 732-949-4556


2005
Message-Id: <TUE.15.MAR.2005.170821.0800.>
Date: Tue, 15 Mar 2005 17:08:21 -0800
From: "Deleganes, Ellen M" <ellen.m.deleganes@intel.com>
Subject: Re: FE-CE data path
Comments: To: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Even if there are good and stable DCCP implementations soon, this
doesn't mean it will become production soon. Won't that be an issue?
Even SCTP isn't all that widely deployed and it still has some of the
technical problems people were raising regarding TCP.

Regards,
Ellen

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Khosravi, Hormuzd M
Sent: Tuesday, March 15, 2005 4:53 PM
To: FORCES@PEACH.EASE.LSOFT.COM
Subject: Re: FE-CE data path

Yes, I am not holding my breath for this either. I tested a few DCCP
implementations before and none were stable. They caused a kernel panic
as soon as I ran a few tests. I do hope, just as you that we find some
good stable DCCP implementations soon.

Are there any timelines set by the Linux community to support DCCP in
the standard kernel release ? If not, would you have an idea of
approximately how far out this might be?


Thanks
Hormuzd

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Jamal Hadi Salim
Sent: Tuesday, March 15, 2005 4:46 PM
To: FORCES@PEACH.EASE.LSOFT.COM
Subject: Re: [FORCES] FE-CE data path

I should know  a little more about the subject because I got Arnaldo
started on Linux DCCP. I havent looked at the code in sometime, but:
I doubt very much i would want to deploy that code with any product i am
responsible for. Mostly because it hasnt been really tested probably by
anyone other than Arnaldo - or deployed for that matter . I am pretty
sure full of spec misconduct as a result of the above. I think in due
time it will be ready - but i wouldnt use this as a reason to say DCCP
is ready.=20

cheers,
jamal


On Tue, 2005-03-15 at 18:23, Khosravi, Hormuzd M wrote:
> Joel,
>=20
> I agree in spirit with what your proposing regarding using DCCP for
the
> data channel and we have mentioned it in the draft as well.
>=20
> Regarding implementation, here is the latest info that I got from the
> DCCP WG couple of days back...
>=20
> -----Original Message-----
> From: dccp-bounces@ietf.org [mailto:dccp-bounces@ietf.org] On Behalf
Of
> Naadir Jeewa
> Sent: Monday, March 14, 2005 12:09 PM
> To: dccp@ietf.org
> Subject: Re: [dccp] Any dccp implementations compliant with the latest
> specs ?
>=20
> Arnaldo Mela @ Conectiva, and I have been working independently on
such
> an implementation. Mines not very good, so I'll probably on Arnaldo's
> code base from now on.
> I need to extract it out of the main BitKeeper tree into a separable
> module. I'll do that by the end of the week and stick it on CVS at
> www.sf.net/projects/linux-dccp once I've done some exams on Wednesday.
> CCID and feature handling need to be added, and a good way of
> implementing those CCIDs needs to be decided upon - perhaps something
> similar to Stephen Hemminger's forthcoming patch to the TCP congestion
> control mechanisms
> ( =
http://marc.theaimsgroup.com/?l=3Dlinux-net&m=3D110920482303293&w=3D2 ).
>=20
> Yours,
> Naadir
>=20
> On Mon, 2005-03-14 at 11:51 -0800, Khosravi, Hormuzd M wrote:
> > I was wondering if there are any DCCP implementations for Linux
Kernel
> > compliant with the latest DCCP specs going for RFC ? If no, are
there
> > any such efforts in play ?
> >=20
> >=20
> > Thanks
> > Hormuzd
> > P.s. I had checked on this sometime last year, hopefully things have
> > progressed on this now.
>=20
> --------------------
>=20
> I haven't looked at this in more detail. But the previous
> implementations that I looked at were not promising at all. If you
have
> any thoughts on this "no running code" issue, let me know?
>=20
> Thanks
> Hormuzd=20
>=20
> -----Original Message-----
> From: Forwarding and Control Element Separation
> [mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern
> Sent: Tuesday, March 15, 2005 2:03 PM
> To: FORCES@PEACH.EASE.LSOFT.COM
> Subject: Re: [FORCES] FE-CE data path
>=20
> I have a basic problem with this.  We are trying to design a
congestion=20
> controlling datagram transfer protocol.  We are not the right place to
> do=20
> that.  Congestion control is known to be very tricky, and obvious
> answers=20
> often have very non-obvious implications.  (Just getting the delay
> bounded=20
> DiffServ stuff to work right took some interesting effort, and I had
> some=20
> very good folks to work with.)
>=20
> it is possible that DCCP is too complex, but there is really no
> difference=20
> between an encapsulation driver (GRE) and a small protocol stack (DCCP
I
> hope.)
>=20
> I will endeavor in the near future to take a good look at the DCCP=20
> documents to see what they really give us and what it will take to use

> it.  (The last protocol I wanted to use did not have the capabilities
I
> was=20
> looking for.)
>=20
> If DCCP is not usable, we are in for a lot of very tricky work to get=20
> congestion control right, particularly since we need it to interact=20
> properly with TCP on the same link.
>=20
> Yours,
> Joel


2005
Message-Id: <TUE.15.MAR.2005.170312.0500.>
Date: Tue, 15 Mar 2005 17:03:12 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: FE-CE data path
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

I have a basic problem with this.  We are trying to design a congestion
controlling datagram transfer protocol.  We are not the right place to do
that.  Congestion control is known to be very tricky, and obvious answers
often have very non-obvious implications.  (Just getting the delay bounded
DiffServ stuff to work right took some interesting effort, and I had some
very good folks to work with.)

it is possible that DCCP is too complex, but there is really no difference
between an encapsulation driver (GRE) and a small protocol stack (DCCP I hope.)

I will endeavor in the near future to take a good look at the DCCP
documents to see what they really give us and what it will take to use
it.  (The last protocol I wanted to use did not have the capabilities I was
looking for.)

If DCCP is not usable, we are in for a lot of very tricky work to get
congestion control right, particularly since we need it to interact
properly with TCP on the same link.

Yours,
Joel

At 04:56 PM 3/15/2005, Furquan A. Ansari wrote:
>Given that there are multiple FEs (and possibly even multiple NEs) sharing
>the interconnect, it is very hard to create the proper configuration for
>each FE to rate limit its data traffic.  In fact, if one assumes that new
>FEs (and possibly new NEs) can be added to the interconnect, it is almost
>impossible to properly set the rate limits.
>
>[Furquan] Yes, coming up with a right solution for rate limiting when
>multiple FEs are sharing an interconnect would be
>difficult, but not impossible - we will have to work on it.  Just as an
>example, every interface going out of the FE
>towards the CE should be rate limited and the aggregation device should
>have the uplink capacity that is in fact
>the aggregate value of all the FE-CE b/w links.
>
>                                     CE
>                                        |
>                                        | B/w=(A+B+C)
>                                        |
>                    -------------
>                    |                    |                |
>             A   |              B   |             C|
>                    |                    |                |
>                    FE1            FE2            FE3
>
>    B/W capacities between FE1-CE = A, FE2-CE = B, FE3-CE = C
>    Rate limited Data channel for FE1 = 0.9A, FE2=0.9B, FE3=0.9C
>
>    This will always ensure that there is enough capacity for the control
> packets between the CE and FEs. I'm
>sure there are other mechanisms, but just wanted to point one possible
>solution.


2005
Message-Id: <TUE.15.MAR.2005.165614.0500.>
Date: Tue, 15 Mar 2005 16:56:14 -0500
From: "Furquan A. Ansari" <furquan@lucent.com>
Organization: Lucent Technologies Inc.
Subject: Re: FE-CE data path
Comments: To: "Joel M. Halpern" <joel@stevecrocker.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

Joel,
    Thanks for the comments. More comments inlime....

Joel M. Halpern wrote:

> Responses in line, since there is much good context from Furquan.
>
> At 03:42 PM 3/15/2005, Furquan A. Ansari wrote:
>
>> ...
>> If congestion is an issue, it should be dealt with with rate limiting
>> packets at the FE (e.g. 90% of the CE-FE b/w
>> for data packets so that control packets will always have enough
>> spare capacity to go through).
>
>
> Given that there are multiple FEs (and possibly even multiple NEs)
> sharing the interconnect, it is very hard to create the proper
> configuration for each FE to rate limit its data traffic.  In fact, if
> one assumes that new FEs (and possibly new NEs) can be added to the
> interconnect, it is almost impossible to properly set the rate limits.

[Furquan] Yes, coming up with a right solution for rate limiting when
multiple FEs are sharing an interconnect would be
difficult, but not impossible - we will have to work on it.  Just as an
example, every interface going out of the FE
towards the CE should be rate limited and the aggregation device should
have the uplink capacity that is in fact
the aggregate value of all the FE-CE b/w links.

                                     CE
                                        |
                                        | B/w=(A+B+C)
                                        |
                    -------------
                    |                    |                |
             A   |              B   |             C|
                    |                    |                |
                    FE1            FE2            FE3

    B/W capacities between FE1-CE = A, FE2-CE = B, FE3-CE = C
    Rate limited Data channel for FE1 = 0.9A, FE2=0.9B, FE3=0.9C

    This will always ensure that there is enough capacity for the
control packets between the CE and FEs. I'm
sure there are other mechanisms, but just wanted to point one possible
solution.

>
>> ---- list of things that I was discussing with other authors and one
>> of our WG chair.
>>
>> 1) First, I don't think there should be a requirement for the "data"
>> traffic to be congestion aware to begin with. It didn't
>> exist in current architectures in single chassis systems - so why
>> should it exist now.
>>    - not having a congestion aware "data" channel DOES NOT introduce
>> "NEW" DDoS attack capabilities.
>>        It is just as good or as bad as existing systems. So it is
>> fully satisfying the requirements (and I don't think that the
>>        requirements RFC specifically mentions that the data channel
>> has to be congestion aware as well, which is correct         - let me
>> know if  I am mistaken here).
>
>
> Note that congestion management within routers is actually a very
> important issue.  Almost all routers carefully prioritize between
> routing control packets and "other" packets.  Routers with internal
> control exchanges prioritize those ahead of routing.  There is a new
> BCP coming out that talks about prioritizing within OSPF.  In our
> environment, overload of data packets will block the control channel.
> That would be "really bad".  This is not really about DDoS.  There are
> perfectly normal things that can cause transient overloads of packets
> needing CE attention.


[Furquan] No doubt that congestion is an important issue and  like I
mentioned below, most protocols have inbuilt congestion control
mechanims. You are absolutely right that there can be transient overload
conditions that may cause congestion and I believe that rate limiting is
sufficient for such cases - without having to resort to a congestion
aware protocol. Certainly, one can maitain different queues in the
router (FE) for control and data packets to realise priorities - with
the control packets added to the higher priority queue.

>
> Hormuz raised the question of wether there are available DCCP stacks.
> If there are, I think we should use it.  If there are not, I think we
> are in a very bad situation.  Ignoring congestion is not a good way out.
>
>> ...
>> 3) All protocol traffic that is destined to the CE as "data" traffic
>> is essentailly non-forces control traffic (e.g.
>> OSPF, BGP, ISIS, LDP, RSVP etc.). Every protocol has in-built
>> congestion control. ICMP flooding may be an issue, but sending it
>> over TCP/dccp/sctp  is not the solution.
>>    - If there are bogus protocol packets sent, they will still be
>> limited to the rates allowed by the protocols themselves -
>>    unless the software running on the neighbors has been compromised
>> - in which case you have much larger problems than congestion control
>> on the FE-CE link (you basically have compromised software on routers)
>
>
> There are known cases where these protocols do not back off very well.
>
>
>> 4) Having TCP between FE and CE leads to severe performance
>> degradation. Data packets on incoming FE
>> interfaces can be switched to gre (or any other tunnel) at wire speed
>> in hardware. Using TCP or UDP ( read DCCP) - as would  be the case if
>> DCCP is used - cannot achieve this. It will have to be taken out,
>> processed, a PL header added and finally a TCP or UDP header added
>> and sent over the session.
>>    - At the other end, you will have to terminate the outer transport
>> session first and have to re-inject the packet
>> back into the kernel for terminating the inner transport session - be
>> it TCP or UDP. It's just plain ugly!
>>    - We essentially have the case of TCP in TCP or TCP in UDP (DCCP)
>> or TCP in SCTP etc. - all having the
>>    same disastrous performance implications and unknown behavior (the
>> result of multiple control loops within
>>    a session)
>>
>>    If a tunnel is used between the FE and CE, the packets arriving on
>> the FE will be switched at wire speed with just
>> the tunnel header added - no TCP/UDP header, no PL header etc. and no
>> processing by the forces module.
>
>
> I believe this issue is one of implementation.  Some amount of driver
> modification is going to be required.  Some amount of packet
> processing of data packets is necessary (even if just to check that
> things are arriving over the proper interfaces.)  Yes, making use of a
> kernel DCCP stack and then shoving the result through TCP may be a bit
> tricky.  But there are ways to make it work.
> If someone can show me how a GRE tunnelled packet will adapt properly
> to congestion and not displace the TCP traffic, maybe we could go with
> a GRE encapsulated frame instead of DCCP. (We would still have to deal
> with the problem of the frame being sent, with its encapsulation,
> being bigger than the interconnect medium size limit.)
>
[Furquan]  Please see the example above with the figure for a possible
solution that can potentially ensure that
the GRE tunnelled packets will not displace TCP control traffic between
the FE and the CE.
As for the the frame being larger than the packet, you are right  that
it can potentially lead to IP fragmentation is
cases where the packet size may cross the MTU size of the network
between the FE and CE. I believe that all
IP devices will "have" to necessarily handle the IP frag cases anyway -
or they won't be fully IPv4 compliant.
Second, even TCP and DCCP will add additional headers on top of the
packet received (in fact many more headers
than for the GRE tunnel header case). This will just as well lead to IP
fragmentation. If the data channel is TCP,
one can argue that TCP negotiates MSS with the other end that may
prevent IP frag to some extent - but it's no
guarantee. With UDP(DCCP) case, there is no such negotiation and will
almost certainly undergo fragmentation
more often that the gre case.

Anyway, I don't think IP frag should be a show stopper.

>
>> 5) I am essentially saying that in some sense the TML header is the
>> tunnel protocol header. I really don't see
>> the need for the "data" packets to be going through the ForCES PL
>> layer for de-muxing to appropriate application (OSPF, BGP etc.) - Put
>> it another way, I am basically saying that there is no PL or TML
>> header for the data packets - since tunneling will be transparent to
>> the applications.
>
>
> The data packets need some sort of header since we must know what
> interface they arrived on, what FE sent them to the CE, and why the CE
> sent them.  That information can not reliably be determined purely
> from the underlying packet.


[Furquan] The tunnel provides this information since it's a
point-to-point interface. It will give you information
regarding which physical interface it came on  - since the GRE tunnel
was created by applying it to some specific
physical interface. Since it's p-to-p, you have information on who the
other end is as well - i.e. which FE sent it.
Don't know why you would need the last case - but in rare situtations
that this is needed, redirecting such data packets
over the control channel with the appropriate "redirect" PL header added
would be the thing to do (Point 7 in my
previous email).


Thanks,

>
> Yours,
> Joel M. Halpern


--
Furquan Ansari
Bell Labs Research			Ph : 732-949-5249
Holmdel, NJ				Fax: 732-949-4556


2005
Message-Id: <TUE.15.MAR.2005.165310.0800.>
Date: Tue, 15 Mar 2005 16:53:10 -0800
From: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
Subject: Re: FE-CE data path
Comments: To: hadi@znyx.com
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Yes, I am not holding my breath for this either. I tested a few DCCP
implementations before and none were stable. They caused a kernel panic
as soon as I ran a few tests. I do hope, just as you that we find some
good stable DCCP implementations soon.

Are there any timelines set by the Linux community to support DCCP in
the standard kernel release ? If not, would you have an idea of
approximately how far out this might be?


Thanks
Hormuzd

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Jamal Hadi Salim
Sent: Tuesday, March 15, 2005 4:46 PM
To: FORCES@PEACH.EASE.LSOFT.COM
Subject: Re: [FORCES] FE-CE data path

I should know  a little more about the subject because I got Arnaldo
started on Linux DCCP. I havent looked at the code in sometime, but:
I doubt very much i would want to deploy that code with any product i am
responsible for. Mostly because it hasnt been really tested probably by
anyone other than Arnaldo - or deployed for that matter . I am pretty
sure full of spec misconduct as a result of the above. I think in due
time it will be ready - but i wouldnt use this as a reason to say DCCP
is ready.=20

cheers,
jamal


On Tue, 2005-03-15 at 18:23, Khosravi, Hormuzd M wrote:
> Joel,
>=20
> I agree in spirit with what your proposing regarding using DCCP for
the
> data channel and we have mentioned it in the draft as well.
>=20
> Regarding implementation, here is the latest info that I got from the
> DCCP WG couple of days back...
>=20
> -----Original Message-----
> From: dccp-bounces@ietf.org [mailto:dccp-bounces@ietf.org] On Behalf
Of
> Naadir Jeewa
> Sent: Monday, March 14, 2005 12:09 PM
> To: dccp@ietf.org
> Subject: Re: [dccp] Any dccp implementations compliant with the latest
> specs ?
>=20
> Arnaldo Mela @ Conectiva, and I have been working independently on
such
> an implementation. Mines not very good, so I'll probably on Arnaldo's
> code base from now on.
> I need to extract it out of the main BitKeeper tree into a separable
> module. I'll do that by the end of the week and stick it on CVS at
> www.sf.net/projects/linux-dccp once I've done some exams on Wednesday.
> CCID and feature handling need to be added, and a good way of
> implementing those CCIDs needs to be decided upon - perhaps something
> similar to Stephen Hemminger's forthcoming patch to the TCP congestion
> control mechanisms
> ( =
http://marc.theaimsgroup.com/?l=3Dlinux-net&m=3D110920482303293&w=3D2 ).
>=20
> Yours,
> Naadir
>=20
> On Mon, 2005-03-14 at 11:51 -0800, Khosravi, Hormuzd M wrote:
> > I was wondering if there are any DCCP implementations for Linux
Kernel
> > compliant with the latest DCCP specs going for RFC ? If no, are
there
> > any such efforts in play ?
> >=20
> >=20
> > Thanks
> > Hormuzd
> > P.s. I had checked on this sometime last year, hopefully things have
> > progressed on this now.
>=20
> --------------------
>=20
> I haven't looked at this in more detail. But the previous
> implementations that I looked at were not promising at all. If you
have
> any thoughts on this "no running code" issue, let me know?
>=20
> Thanks
> Hormuzd=20
>=20
> -----Original Message-----
> From: Forwarding and Control Element Separation
> [mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern
> Sent: Tuesday, March 15, 2005 2:03 PM
> To: FORCES@PEACH.EASE.LSOFT.COM
> Subject: Re: [FORCES] FE-CE data path
>=20
> I have a basic problem with this.  We are trying to design a
congestion=20
> controlling datagram transfer protocol.  We are not the right place to
> do=20
> that.  Congestion control is known to be very tricky, and obvious
> answers=20
> often have very non-obvious implications.  (Just getting the delay
> bounded=20
> DiffServ stuff to work right took some interesting effort, and I had
> some=20
> very good folks to work with.)
>=20
> it is possible that DCCP is too complex, but there is really no
> difference=20
> between an encapsulation driver (GRE) and a small protocol stack (DCCP
I
> hope.)
>=20
> I will endeavor in the near future to take a good look at the DCCP=20
> documents to see what they really give us and what it will take to use

> it.  (The last protocol I wanted to use did not have the capabilities
I
> was=20
> looking for.)
>=20
> If DCCP is not usable, we are in for a lot of very tricky work to get=20
> congestion control right, particularly since we need it to interact=20
> properly with TCP on the same link.
>=20
> Yours,
> Joel


2005
Message-Id: <TUE.15.MAR.2005.160942.0800.>
Date: Tue, 15 Mar 2005 16:09:42 -0800
From: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
Subject: Re: FE-CE data path
Comments: To: "Joel M. Halpern" <joel@stevecrocker.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Good point, Joel. This is one of the reasons we would need a some/PL
header for data packets.

I am not sure this would be solved with tunnels, unless you setup a
tunnel per external FE interface and that could be several hundred
tunnels if there are as many interfaces on the router.
You need this information (on which port/interface a packet arrived on
the FE), for multicast forwarding.

regards
Hormuzd

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern

>5) I am essentially saying that in some sense the TML header is the
tunnel=20
>protocol header. I really don't see
>the need for the "data" packets to be going through the ForCES PL layer

>for de-muxing to appropriate application (OSPF, BGP etc.) - Put it
another=20
>way, I am basically saying that there is no PL or TML header for the
data=20
>packets - since tunneling will be transparent to the applications.

The data packets need some sort of header since we must know what
interface=20
they arrived on, what FE sent them to the CE, and why the CE sent=20
them.  That information can not reliably be determined purely from the=20
underlying packet.

Yours,
Joel M. Halpern


2005
Message-Id: <TUE.15.MAR.2005.160452.0500.>
Date: Tue, 15 Mar 2005 16:04:52 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: FE-CE data path
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

I think that there is a different issue.
TCP and SCTOP will both choose to provide retransmission.
For the data channel, we want adaptive congestion control (rate limiting)
with dropping of old packets.  We do not want ever want data channel
packets retransmited.

In contrast, the control channel actually requires retransmission for
reliability.

Are you suggesting a non-retransmitting mode of SCTP as an alternative to
DCCP for the data channel?
If so, I would be interested in the details of what that mode does.  (Also,
since most of us associated SCTP with the reliable mode, I at least jumped
to the conclusion you meant reliable SCTP when you initially suggested SCTP
without a qualifier.)

Yours,
Joel

At 04:26 AM 3/14/2005, Jamal Hadi Salim wrote:
>The real problem is not _reliability_ as provided by TCP - rather the
>Head of Line Blocking presented by TCP (which is clearly visible when
>you run a reliable protocol on top of it such as mentioned OSPF).
>
>PR-SCTP resolves this. Look at RFC 3758.
>
>cheers,
>jamal


2005
Message-Id: <TUE.15.MAR.2005.155435.0500.>
Date: Tue, 15 Mar 2005 15:54:35 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: FE-CE data path
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

Responses in line, since there is much good context from Furquan.

At 03:42 PM 3/15/2005, Furquan A. Ansari wrote:
>...
>If congestion is an issue, it should be dealt with with rate limiting
>packets at the FE (e.g. 90% of the CE-FE b/w
>for data packets so that control packets will always have enough spare
>capacity to go through).

Given that there are multiple FEs (and possibly even multiple NEs) sharing
the interconnect, it is very hard to create the proper configuration for
each FE to rate limit its data traffic.  In fact, if one assumes that new
FEs (and possibly new NEs) can be added to the interconnect, it is almost
impossible to properly set the rate limits.

>---- list of things that I was discussing with other authors and one of
>our WG chair.
>
>1) First, I don't think there should be a requirement for the "data"
>traffic to be congestion aware to begin with. It didn't
>exist in current architectures in single chassis systems - so why should
>it exist now.
>    - not having a congestion aware "data" channel DOES NOT introduce
> "NEW" DDoS attack capabilities.
>        It is just as good or as bad as existing systems. So it is fully
> satisfying the requirements (and I don't think that the
>        requirements RFC specifically mentions that the data channel has
> to be congestion aware as well, which is correct         - let me know
> if  I am mistaken here).

Note that congestion management within routers is actually a very important
issue.  Almost all routers carefully prioritize between routing control
packets and "other" packets.  Routers with internal control exchanges
prioritize those ahead of routing.  There is a new BCP coming out that
talks about prioritizing within OSPF.  In our environment, overload of data
packets will block the control channel.  That would be "really bad".  This
is not really about DDoS.  There are perfectly normal things that can cause
transient overloads of packets needing CE attention.

Hormuz raised the question of wether there are available DCCP stacks.  If
there are, I think we should use it.  If there are not, I think we are in a
very bad situation.  Ignoring congestion is not a good way out.

>...
>3) All protocol traffic that is destined to the CE as "data" traffic is
>essentailly non-forces control traffic (e.g.
>OSPF, BGP, ISIS, LDP, RSVP etc.). Every protocol has in-built congestion
>control. ICMP flooding may be an issue, but sending it over
>TCP/dccp/sctp  is not the solution.
>    - If there are bogus protocol packets sent, they will still be limited
> to the rates allowed by the protocols themselves -
>    unless the software running on the neighbors has been compromised - in
> which case you have much larger problems than congestion control on the
> FE-CE link (you basically have compromised software on routers)

There are known cases where these protocols do not back off very well.


>4) Having TCP between FE and CE leads to severe performance degradation.
>Data packets on incoming FE
>interfaces can be switched to gre (or any other tunnel) at wire speed in
>hardware. Using TCP or UDP ( read DCCP) - as would  be the case if DCCP is
>used - cannot achieve this. It will have to be taken out, processed, a PL
>header added and finally a TCP or UDP header added and sent over the session.
>    - At the other end, you will have to terminate the outer transport
> session first and have to re-inject the packet
>back into the kernel for terminating the inner transport session - be it
>TCP or UDP. It's just plain ugly!
>    - We essentially have the case of TCP in TCP or TCP in UDP (DCCP) or
> TCP in SCTP etc. - all having the
>    same disastrous performance implications and unknown behavior (the
> result of multiple control loops within
>    a session)
>
>    If a tunnel is used between the FE and CE, the packets arriving on the
> FE will be switched at wire speed with just
>the tunnel header added - no TCP/UDP header, no PL header etc. and no
>processing by the forces module.

I believe this issue is one of implementation.  Some amount of driver
modification is going to be required.  Some amount of packet processing of
data packets is necessary (even if just to check that things are arriving
over the proper interfaces.)  Yes, making use of a kernel DCCP stack and
then shoving the result through TCP may be a bit tricky.  But there are
ways to make it work.
If someone can show me how a GRE tunnelled packet will adapt properly to
congestion and not displace the TCP traffic, maybe we could go with a GRE
encapsulated frame instead of DCCP. (We would still have to deal with the
problem of the frame being sent, with its encapsulation, being bigger than
the interconnect medium size limit.)


>5) I am essentially saying that in some sense the TML header is the tunnel
>protocol header. I really don't see
>the need for the "data" packets to be going through the ForCES PL layer
>for de-muxing to appropriate application (OSPF, BGP etc.) - Put it another
>way, I am basically saying that there is no PL or TML header for the data
>packets - since tunneling will be transparent to the applications.

The data packets need some sort of header since we must know what interface
they arrived on, what FE sent them to the CE, and why the CE sent
them.  That information can not reliably be determined purely from the
underlying packet.

Yours,
Joel M. Halpern


2005
Message-Id: <TUE.15.MAR.2005.154251.0500.>
Date: Tue, 15 Mar 2005 15:42:51 -0500
From: "Furquan A. Ansari" <furquan@lucent.com>
Organization: Lucent Technologies Inc.
Subject: Re: FE-CE data path
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

Folks,

As Joel pointed out, we chatted with him after the meeting (on the TCP
TML) and discussed some of the interesting issues with using TCP for the
data channel. I have various reservations with respect to using TCP or
any other
transport layer protocol (e.g. SCTP, UDP etc.) for the data channel. It
is now my belief that a tunnel between the
CE and FE would be better suited for forwarding the data packets without
involving the transport layer protocols.
If congestion is an issue, it should be dealt with with rate limiting
packets at the FE (e.g. 90% of the CE-FE b/w
for data packets so that control packets will always have enough spare
capacity to go through).


I would like to bring out some of the issues for discussion for the data
channel. As authors of the draft, we ourselves
have not converged on what the ideal solution would be for the "data"
channel - though we all agree that TCP would
be ideal for the control channel. [So, the comments below are based on
my views and may not necessarily reflect
those of the other author's on the draft - though they are welcome to
comment on it :) ]

PS: As for Jamal's comment regarding SCTP - I don't agree with him that
SCTP would be better suited and
it falls in the same category as TCP and the issue are exactly the same
as TCP.


---- list of things that I was discussing with other authors and one of
our WG chair.

1) First, I don't think there should be a requirement for the "data"
traffic to be congestion aware to begin with. It didn't
exist in current architectures in single chassis systems - so why should
it exist now.
    - not having a congestion aware "data" channel DOES NOT introduce
"NEW" DDoS attack capabilities.
        It is just as good or as bad as existing systems. So it is fully
satisfying the requirements (and I don't think that the
        requirements RFC specifically mentions that the data channel has
to be congestion aware as well, which is correct         - let me know
if  I am mistaken here).

2) I don't agree on how just having a congestion aware channel would
"protect" against DDoS attacks. I just don't believe that using TCP or
DCCP for the data channel would protect against DDoS attacks - since the
attacks can be more than just "bandwidth attacks" (SYN flooding etc.).
All known solutions for DDoS bandwidth attacks are based on rate
limiting only.

3) All protocol traffic that is destined to the CE as "data" traffic is
essentailly non-forces control traffic (e.g.
OSPF, BGP, ISIS, LDP, RSVP etc.). Every protocol has in-built congestion
control. ICMP flooding may be an issue, but sending it over
TCP/dccp/sctp  is not the solution.
    - If there are bogus protocol packets sent, they will still be
limited to the rates allowed by the protocols themselves -
    unless the software running on the neighbors has been compromised -
in which case you have much larger problems than congestion control on
the FE-CE link (you basically have compromised software on routers)

4) Having TCP between FE and CE leads to severe performance degradation.
Data packets on incoming FE
interfaces can be switched to gre (or any other tunnel) at wire speed in
hardware. Using TCP or UDP ( read DCCP) - as would  be the case if DCCP
is used - cannot achieve this. It will have to be taken out, processed,
a PL header added and finally a TCP or UDP header added and sent over
the session.
    - At the other end, you will have to terminate the outer transport
session first and have to re-inject the packet
back into the kernel for terminating the inner transport session - be it
TCP or UDP. It's just plain ugly!
    - We essentially have the case of TCP in TCP or TCP in UDP (DCCP) or
TCP in SCTP etc. - all having the
    same disastrous performance implications and unknown behavior (the
result of multiple control loops within
    a session)

    If a tunnel is used between the FE and CE, the packets arriving on
the FE will be switched at wire speed with just
the tunnel header added - no TCP/UDP header, no PL header etc. and no
processing by the forces module.

5) I am essentially saying that in some sense the TML header is the
tunnel protocol header. I really don't see
the need for the "data" packets to be going through the ForCES PL layer
for de-muxing to appropriate application (OSPF, BGP etc.) - Put it
another way, I am basically saying that there is no PL or TML header for
the data packets - since tunneling will be transparent to the applications.

6) The effects of reliability of TCP or SCTP on the FE-CE link are not
clearly known and will be very difficult to
quantify the results. There will be multiple cases of duplicate packets
being delivered to the applications (protocols)
that are not only unnecessary but also may potentially lead to incorrect
behavior. I can cite examples of how it can
potentially lead to incorrect operation for many protocols, but will
defer for later.

7) I am not saying that the PL "redirect" header should be eliminated.
There may still be some instances where
some data packets have to be sent from the FE to the CE encasulated in
the PL message. Such messages can
be treated in a special way and sent over the TCP control channel itself
- with the PL redirect header added
to such packets.

8) Packet ordering is not an issue on the data channel - each individual
application will deal in its own way.

---------

So, the pitfalls of using any kind of transport layer protocol are
similar - TCP, SCTP, DCCP (UDP). So, I propose
using some kind of tunneling mechanism for the data channel.

Thanks,


Joel M. Halpern wrote:

> In the TML document there is a very clear discussion of the tradeoffs
> in using various protocols for forwarding data packets between the FE
> and the CE (in either direction.)
> After the meeting, I chatted with the document authors a bit, as they
> had found some interesting issues that were not mentioned in the draft.
>
> For example, they quite correctly pointed out that forwarding IP
> packets which are part of an external reliability scheme (TCP or OSPF
> retransmission, or  ...) over TCP can produce some quite interesting
> problems.
>
> Later, I was chatting with one of our chairs who also pointed out that
> forwarding TCP over TCP is not a good idea.
>
> However, the data channel can induce congestion.  And that congestion
> can have very severe impacts on the control channel.  Particularly
> since the control channel will slow down in the presence of congestion.
>
> We could try to craft a multi-part scheme with configured rates, some
> data traffic over TCP and some over UDP, and some additional feedback
> to try to keep the whole thing in balance.  The odds are it won't work
> right.
>
> Given these choices, and given other external developments, I would
> like to raises a question that has been discussed and agreed in the
> past.  (The chairs can tell me there is not enough external change and
> I should shut up.)  DCCP is nearing IESG approval.  I am told that
> there are DCCP stacks available.  Would it make more sense for us to
> simply use DCCP for our mandatory-to-implement FE-CE data channel
> protocol?  (This does not prohibit other protocols / encapsulations
> for suitable environments.)
>
> Thank you,
> Joel M. Halpern


--
Furquan Ansari
Bell Labs Research			Ph : 732-949-5249
Holmdel, NJ				Fax: 732-949-4556


2005
Message-Id: <TUE.15.MAR.2005.152354.0800.>
Date: Tue, 15 Mar 2005 15:23:54 -0800
From: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
Subject: Re: FE-CE data path
Comments: To: "Joel M. Halpern" <joel@stevecrocker.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
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Joel,

I agree in spirit with what your proposing regarding using DCCP for the
data channel and we have mentioned it in the draft as well.

Regarding implementation, here is the latest info that I got from the
DCCP WG couple of days back...

-----Original Message-----
From: dccp-bounces@ietf.org [mailto:dccp-bounces@ietf.org] On Behalf Of
Naadir Jeewa
Sent: Monday, March 14, 2005 12:09 PM
To: dccp@ietf.org
Subject: Re: [dccp] Any dccp implementations compliant with the latest
specs ?

Arnaldo Mela @ Conectiva, and I have been working independently on such
an implementation. Mines not very good, so I'll probably on Arnaldo's
code base from now on.
I need to extract it out of the main BitKeeper tree into a separable
module. I'll do that by the end of the week and stick it on CVS at
www.sf.net/projects/linux-dccp once I've done some exams on Wednesday.
CCID and feature handling need to be added, and a good way of
implementing those CCIDs needs to be decided upon - perhaps something
similar to Stephen Hemminger's forthcoming patch to the TCP congestion
control mechanisms
( http://marc.theaimsgroup.com/?l=3Dlinux-net&m=3D110920482303293&w=3D2 =
).

Yours,
Naadir

On Mon, 2005-03-14 at 11:51 -0800, Khosravi, Hormuzd M wrote:
> I was wondering if there are any DCCP implementations for Linux Kernel
> compliant with the latest DCCP specs going for RFC ? If no, are there
> any such efforts in play ?
>=20
>=20
> Thanks
> Hormuzd
> P.s. I had checked on this sometime last year, hopefully things have
> progressed on this now.

--------------------

I haven't looked at this in more detail. But the previous
implementations that I looked at were not promising at all. If you have
any thoughts on this "no running code" issue, let me know?

Thanks
Hormuzd=20

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern
Sent: Tuesday, March 15, 2005 2:03 PM
To: FORCES@PEACH.EASE.LSOFT.COM
Subject: Re: [FORCES] FE-CE data path

I have a basic problem with this.  We are trying to design a congestion=20
controlling datagram transfer protocol.  We are not the right place to
do=20
that.  Congestion control is known to be very tricky, and obvious
answers=20
often have very non-obvious implications.  (Just getting the delay
bounded=20
DiffServ stuff to work right took some interesting effort, and I had
some=20
very good folks to work with.)

it is possible that DCCP is too complex, but there is really no
difference=20
between an encapsulation driver (GRE) and a small protocol stack (DCCP I
hope.)

I will endeavor in the near future to take a good look at the DCCP=20
documents to see what they really give us and what it will take to use=20
it.  (The last protocol I wanted to use did not have the capabilities I
was=20
looking for.)

If DCCP is not usable, we are in for a lot of very tricky work to get=20
congestion control right, particularly since we need it to interact=20
properly with TCP on the same link.

Yours,
Joel


2005
Message-Id: <TUE.15.MAR.2005.145905.0800.>
Date: Tue, 15 Mar 2005 14:59:05 -0800
From: "Putzolu, David" <david.putzolu@intel.com>
Subject: Re: FE-CE data path
Comments: To: hadi@znyx.com
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

[hat off...]

Hi Jamal - comment inline.

-David=20

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Jamal Hadi Salim
Sent: Monday, March 14, 2005 2:32 AM
To: FORCES@PEACH.EASE.LSOFT.COM
Subject: Re: [FORCES] FE-CE data path

Joel,

I missed one subtle thing from your earlier email which became obvious
reading Furquans last email - in that we are only talking about data
"channel".

Yes i was suggesting SCTP-PR instead of DCCP. I wouldnt call it
non-retransmiting; however it is tunable to remove HOL.

However, upon further reflection, even i would not advocate the
mandatory use of SCTP-PR in this case.=20

My reasons are slightly different than what Furquan and Shuchi: I do
think issues they faced of "reliability tunings" such as timers mismatch
etc that result in HOL, can be overcome with SCTP-PR/UDP/DCCP (but not
TCP). =20
However, I dont think that we can force an implementation scheme.
A lot of commodity hardware exists that can encapsulate the data
channel packets in some header such as GRE, VLAN etc. Enforcing that
such packets MUST be encapsulated in SCTP is going to be a perfomance
problem and not very practical.=20

David> In order to achieve true interop between FEs and CEs
David> don't we have to specify a particular protocol to use?
David> Put another way, if we do not specify the protocol,=20
David> what guarantee is there that FooCorp FE can communicate
David> with BarCorp CE?
David>=20
David> Also, is there strong evidence that SCTP, TCP, DCCP,=20
David> etc. are performance problems?   The processing of the
David> app layer payload bytes for the protocols a router
David> engages in is at least two orders of magnitude more
David> complex than transport layer processing.  I.e. for
David> every byte of OSPF traffic a router receives, it may
David> spend 10 cycles to encapsulate it in TCP,  but it=20
David> will probably spend 1,000 cycles for the associated=20
David> SPF calculation.  Reducing the transport overhead
David> from 10 cycles to 1 cycle won't actually affect the
David> router performance in any way...

cheers,
jamal

On Tue, 2005-03-15 at 16:04, Joel M. Halpern wrote:
> I think that there is a different issue.
> TCP and SCTOP will both choose to provide retransmission.
> For the data channel, we want adaptive congestion control (rate
limiting)=20
> with dropping of old packets.  We do not want ever want data channel=20
> packets retransmited.
>=20
> In contrast, the control channel actually requires retransmission for=20
> reliability.
>=20
> Are you suggesting a non-retransmitting mode of SCTP as an alternative
to=20
> DCCP for the data channel?
> If so, I would be interested in the details of what that mode does.
(Also,=20
> since most of us associated SCTP with the reliable mode, I at least
jumped=20
> to the conclusion you meant reliable SCTP when you initially suggested
SCTP=20
> without a qualifier.)
>=20
> Yours,
> Joel
>=20
> At 04:26 AM 3/14/2005, Jamal Hadi Salim wrote:
> >The real problem is not _reliability_ as provided by TCP - rather the
> >Head of Line Blocking presented by TCP (which is clearly visible when
> >you run a reliable protocol on top of it such as mentioned OSPF).
> >
> >PR-SCTP resolves this. Look at RFC 3758.
> >
> >cheers,
> >jamal


2005
Message-Id: <TUE.15.MAR.2005.143439.0500.>
Date: Tue, 15 Mar 2005 14:34:39 -0500
From: Tolga Asveren <asveren@ulticom.com>
Subject: Re: FE-CE data path
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

one question inline...
> -----Original Message-----
> From: Forwarding and Control Element Separation
> [mailto:FORCES@PEACH.EASE.LSOFT.COM]On Behalf Of Jamal Hadi Salim
> Sent: Monday, March 14, 2005 3:16 AM
> To: FORCES@PEACH.EASE.LSOFT.COM
> Subject: Re: FE-CE data path
>
>
> On Tue, 2005-03-15 at 11:37, Joel M. Halpern wrote:
> > In the TML document there is a very clear discussion of the
> tradeoffs in
> > using various protocols for forwarding data packets between the
> FE and the
> > CE (in either direction.)
> > After the meeting, I chatted with the document authors a bit,
> as they had
> > found some interesting issues that were not mentioned in the draft.
> >
> > For example, they quite correctly pointed out that forwarding
> IP packets
> > which are part of an external reliability scheme (TCP or OSPF
> > retransmission, or  ...) over TCP can produce some quite
> interesting problems.
> >
> > Later, I was chatting with one of our chairs who also pointed out that
> > forwarding TCP over TCP is not a good idea.
> >
>
> Glad this is being understood.
> [At least I hope not to be chased around anymore with baseball bats for
> being against TCP].
>
> > However, the data channel can induce congestion.  And that
> congestion can
> > have very severe impacts on the control channel.  Particularly
> since the
> > control channel will slow down in the presence of congestion.
> >
> > We could try to craft a multi-part scheme with configured
> rates, some data
> > traffic over TCP and some over UDP, and some additional
> feedback to try to
> > keep the whole thing in balance.  The odds are it won't work right.
> >
> > Given these choices, and given other external developments, I
> would like to
> > raises a question that has been discussed and agreed in the past.  (The
> > chairs can tell me there is not enough external change and I
> should shut
> > up.)  DCCP is nearing IESG approval.  I am told that there are
> DCCP stacks
> > available.  Would it make more sense for us to simply use DCCP for our
> > mandatory-to-implement FE-CE data channel protocol?  (This does not
> > prohibit other protocols / encapsulations for suitable environments.)
> >
>
> Ive mentioned SCTP a few times so far as an alternative.
[TOLGA]If reliability is provided externally -by running TCP/SCTP etc... on
service endpoints, and I think this is assumed in the context of this
discussion-, wouldn't SCTP also an overkill, afterall it also would provide
an additonal layer of reliability, which would consume computing resources?
For such a setup, the only problem I see with UDP is lack of congestion
control, which is the reason for DCCP.
>
> We (Weiming, Robert, Alex and myself) are working on a SCTP based TML
> to replace the old draft we had. We will be putting out a draft soon.
>
> Both SCTP and DCCP are still newish. However, SCTP is far more widely
> deployed. The only missing "feature" from the SCTP swiss knife is
> multicast. There maybe need for the TML to deploy UDP in addition when
> multicast is needed.
>
> cheers,
> jamal


2005
Message-Id: <TUE.15.MAR.2005.131326.0800.>
Date: Tue, 15 Mar 2005 13:13:26 -0800
From: "Chawla, Shuchi" <shuchi.chawla@intel.com>
Subject: Re: FE-CE data path
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Based on the discussions Furquan and I had after the ForCES meeting, and
some discussions with Joel, I am also leaning in the direction of not
using any kind of transport protocol for the data channel.  So, in that
sense, whether it's TCP or SCTP etc. would be immaterial.  It seems that
minimal intervention by ForCES (bypass PL/TML) on the data channel would
be appropriate:=20
1) for performance reasons and=20
2) this is data that ForCES shouldn't need to mess with

Based on the above, tunneling might be appropriate with the use of a
minimal header with enough information to process the packet once
received on the CE or the FE.  With respect to this data channel
overwhelming the control channel, as Furquan has mentioned, some sort of
rate limits may be implemented;  what may be problematic is to how to
guarantee these rate limits across multiple FEs connecting to a single
CE.  Presumably, there is some maximum bandwidth available per FE-CE
connection in an NE, and the limit of the data channel would be some
fraction of the per FE-CE connection?

If anyone is aware of data/experimentation available on the use of the
suggested options, that might be helpful.

Regards,
Shuchi
-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Furquan A. Ansari
Sent: Tuesday, March 15, 2005 12:43 PM
To: FORCES@PEACH.EASE.LSOFT.COM
Subject: Re: FE-CE data path

Folks,

As Joel pointed out, we chatted with him after the meeting (on the TCP=20
TML) and discussed some of the interesting issues with using TCP for the

data channel. I have various reservations with respect to using TCP or=20
any other
transport layer protocol (e.g. SCTP, UDP etc.) for the data channel. It=20
is now my belief that a tunnel between the
CE and FE would be better suited for forwarding the data packets without

involving the transport layer protocols.
If congestion is an issue, it should be dealt with with rate limiting=20
packets at the FE (e.g. 90% of the CE-FE b/w
for data packets so that control packets will always have enough spare=20
capacity to go through).


I would like to bring out some of the issues for discussion for the data

channel. As authors of the draft, we ourselves
have not converged on what the ideal solution would be for the "data"=20
channel - though we all agree that TCP would
be ideal for the control channel. [So, the comments below are based on=20
my views and may not necessarily reflect
those of the other author's on the draft - though they are welcome to=20
comment on it :) ]

PS: As for Jamal's comment regarding SCTP - I don't agree with him that=20
SCTP would be better suited and
it falls in the same category as TCP and the issue are exactly the same=20
as TCP.


---- list of things that I was discussing with other authors and one of=20
our WG chair.

1) First, I don't think there should be a requirement for the "data"=20
traffic to be congestion aware to begin with. It didn't
exist in current architectures in single chassis systems - so why should

it exist now.
    - not having a congestion aware "data" channel DOES NOT introduce=20
"NEW" DDoS attack capabilities.
        It is just as good or as bad as existing systems. So it is fully

satisfying the requirements (and I don't think that the
        requirements RFC specifically mentions that the data channel has

to be congestion aware as well, which is correct         - let me know=20
if  I am mistaken here).

2) I don't agree on how just having a congestion aware channel would=20
"protect" against DDoS attacks. I just don't believe that using TCP or=20
DCCP for the data channel would protect against DDoS attacks - since the

attacks can be more than just "bandwidth attacks" (SYN flooding etc.).=20
All known solutions for DDoS bandwidth attacks are based on rate=20
limiting only.

3) All protocol traffic that is destined to the CE as "data" traffic is=20
essentailly non-forces control traffic (e.g.
OSPF, BGP, ISIS, LDP, RSVP etc.). Every protocol has in-built congestion

control. ICMP flooding may be an issue, but sending it over=20
TCP/dccp/sctp  is not the solution.
    - If there are bogus protocol packets sent, they will still be=20
limited to the rates allowed by the protocols themselves -
    unless the software running on the neighbors has been compromised -=20
in which case you have much larger problems than congestion control on=20
the FE-CE link (you basically have compromised software on routers)

4) Having TCP between FE and CE leads to severe performance degradation.

Data packets on incoming FE
interfaces can be switched to gre (or any other tunnel) at wire speed in

hardware. Using TCP or UDP ( read DCCP) - as would  be the case if DCCP=20
is used - cannot achieve this. It will have to be taken out, processed,=20
a PL header added and finally a TCP or UDP header added and sent over=20
the session.
    - At the other end, you will have to terminate the outer transport=20
session first and have to re-inject the packet
back into the kernel for terminating the inner transport session - be it

TCP or UDP. It's just plain ugly!
    - We essentially have the case of TCP in TCP or TCP in UDP (DCCP) or

TCP in SCTP etc. - all having the
    same disastrous performance implications and unknown behavior (the=20
result of multiple control loops within
    a session)

    If a tunnel is used between the FE and CE, the packets arriving on=20
the FE will be switched at wire speed with just
the tunnel header added - no TCP/UDP header, no PL header etc. and no=20
processing by the forces module.

5) I am essentially saying that in some sense the TML header is the=20
tunnel protocol header. I really don't see
the need for the "data" packets to be going through the ForCES PL layer=20
for de-muxing to appropriate application (OSPF, BGP etc.) - Put it=20
another way, I am basically saying that there is no PL or TML header for

the data packets - since tunneling will be transparent to the
applications.

6) The effects of reliability of TCP or SCTP on the FE-CE link are not=20
clearly known and will be very difficult to
quantify the results. There will be multiple cases of duplicate packets=20
being delivered to the applications (protocols)
that are not only unnecessary but also may potentially lead to incorrect

behavior. I can cite examples of how it can
potentially lead to incorrect operation for many protocols, but will=20
defer for later.

7) I am not saying that the PL "redirect" header should be eliminated.=20
There may still be some instances where
some data packets have to be sent from the FE to the CE encasulated in=20
the PL message. Such messages can
be treated in a special way and sent over the TCP control channel itself

- with the PL redirect header added
to such packets.

8) Packet ordering is not an issue on the data channel - each individual

application will deal in its own way.

---------

So, the pitfalls of using any kind of transport layer protocol are=20
similar - TCP, SCTP, DCCP (UDP). So, I propose
using some kind of tunneling mechanism for the data channel.

Thanks,


Joel M. Halpern wrote:

> In the TML document there is a very clear discussion of the tradeoffs=20
> in using various protocols for forwarding data packets between the FE=20
> and the CE (in either direction.)
> After the meeting, I chatted with the document authors a bit, as they=20
> had found some interesting issues that were not mentioned in the
draft.
>
> For example, they quite correctly pointed out that forwarding IP=20
> packets which are part of an external reliability scheme (TCP or OSPF=20
> retransmission, or  ...) over TCP can produce some quite interesting=20
> problems.
>
> Later, I was chatting with one of our chairs who also pointed out that

> forwarding TCP over TCP is not a good idea.
>
> However, the data channel can induce congestion.  And that congestion=20
> can have very severe impacts on the control channel.  Particularly=20
> since the control channel will slow down in the presence of
congestion.
>
> We could try to craft a multi-part scheme with configured rates, some=20
> data traffic over TCP and some over UDP, and some additional feedback=20
> to try to keep the whole thing in balance.  The odds are it won't work

> right.
>
> Given these choices, and given other external developments, I would=20
> like to raises a question that has been discussed and agreed in the=20
> past.  (The chairs can tell me there is not enough external change and

> I should shut up.)  DCCP is nearing IESG approval.  I am told that=20
> there are DCCP stacks available.  Would it make more sense for us to=20
> simply use DCCP for our mandatory-to-implement FE-CE data channel=20
> protocol?  (This does not prohibit other protocols / encapsulations=20
> for suitable environments.)
>
> Thank you,
> Joel M. Halpern


--=20
Furquan Ansari
Bell Labs Research			Ph : 732-949-5249
Holmdel, NJ				Fax: 732-949-4556


2005
Message-Id: <TUE.15.MAR.2005.120953.0800.>
Date: Tue, 15 Mar 2005 12:09:53 -0800
From: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
Subject: Re: FE-CE data path
Comments: To: Tolga Asveren <asveren@ulticom.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Tolga Asveren
>
> Ive mentioned SCTP a few times so far as an alternative.
[TOLGA]If reliability is provided externally -by running TCP/SCTP etc...
on
service endpoints, and I think this is assumed in the context of this
discussion-, wouldn't SCTP also an overkill, afterall it also would
provide
an additonal layer of reliability, which would consume computing
resources?
For such a setup, the only problem I see with UDP is lack of congestion
control, which is the reason for DCCP.

[HK] I agree, there is no difference between using TCP or SCTP for the
data channel. They both have the same problems. What is fundamentally
needed is unreliable transport with congestion control. DCCP fits this
perfectly. The only problem I have with DCCP is that there are no
running stacks right now which are compliant with the latest specs. I
have tested some of the older stacks which are available but they are
not stable either. So yes, it is getting close to RFC status but without
any running code...which surprises me!

The other option which comes to mind is what Joel proposed, using UDP or
some kind of tunneling with some rate control mechanisms. I have my
doubts whether this will work, similar to what Joel expressed.


regards
Hormuzd


2005
Message-Id: <TUE.15.MAR.2005.113746.0500.>
Date: Tue, 15 Mar 2005 11:37:46 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: FE-CE data path
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

In the TML document there is a very clear discussion of the tradeoffs in
using various protocols for forwarding data packets between the FE and the
CE (in either direction.)
After the meeting, I chatted with the document authors a bit, as they had
found some interesting issues that were not mentioned in the draft.

For example, they quite correctly pointed out that forwarding IP packets
which are part of an external reliability scheme (TCP or OSPF
retransmission, or  ...) over TCP can produce some quite interesting problems.

Later, I was chatting with one of our chairs who also pointed out that
forwarding TCP over TCP is not a good idea.

However, the data channel can induce congestion.  And that congestion can
have very severe impacts on the control channel.  Particularly since the
control channel will slow down in the presence of congestion.

We could try to craft a multi-part scheme with configured rates, some data
traffic over TCP and some over UDP, and some additional feedback to try to
keep the whole thing in balance.  The odds are it won't work right.

Given these choices, and given other external developments, I would like to
raises a question that has been discussed and agreed in the past.  (The
chairs can tell me there is not enough external change and I should shut
up.)  DCCP is nearing IESG approval.  I am told that there are DCCP stacks
available.  Would it make more sense for us to simply use DCCP for our
mandatory-to-implement FE-CE data channel protocol?  (This does not
prohibit other protocols / encapsulations for suitable environments.)

Thank you,
Joel M. Halpern


2005
Message-Id: <MON.14.MAR.2005.080852.0500.>
Date: Mon, 14 Mar 2005 08:08:52 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: ZNYX Networks
Subject: Re: FE-CE data path
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

David,

On Tue, 2005-03-15 at 17:59, Putzolu, David wrote:
> [hat off...]
>
> Hi Jamal - comment inline.
>
> -David
>
> -----Original Message-----
> From: Forwarding and Control Element Separation
> [mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Jamal Hadi Salim
> Sent: Monday, March 14, 2005 2:32 AM
> To: FORCES@PEACH.EASE.LSOFT.COM
> Subject: Re: [FORCES] FE-CE data path

> However, I dont think that we can force an implementation scheme.
> A lot of commodity hardware exists that can encapsulate the data
> channel packets in some header such as GRE, VLAN etc. Enforcing that
> such packets MUST be encapsulated in SCTP is going to be a perfomance
> problem and not very practical.
>
> David> In order to achieve true interop between FEs and CEs
> David> don't we have to specify a particular protocol to use?
> David> Put another way, if we do not specify the protocol,
> David> what guarantee is there that FooCorp FE can communicate
> David> with BarCorp CE?
> David>

IMO, this falls into a general config issue:
You dont necessarily need a protocol. But you need some LFB which both
understand to make sure they interop.
In the example above if BarCorp CE knows that FooCorp FE supports
hardware level packet redirection (because it discovered this in the
capability phase) and that the FE can police and can attach VLAN headers
to said redirected packets then it can tell it, "when you see OSPF
packets with following signature .... meter not to exceed 1Mbps, if it
does drop it; if it doesnt, attach VLAN tag X, srcMACY, dstMACx,
priority value X and then send to your port Z".
The CE maps that VLAN with those parameters to whatever s.ware (or
instance of) that is executing OSPF.
I am gonna claim this feature above is commodity or close to.
Infact i see this as being very common with newer and upcoming
architectures like ATCA where theres a clear demarcation between
base (control) links and fabric(data) links.
Of course to facilitate the interop someone is gonna have to
write a draft describing these schemes - maybe i should whip one.

> David> Also, is there strong evidence that SCTP, TCP, DCCP,
> David> etc. are performance problems?   The processing of the
> David> app layer payload bytes for the protocols a router
> David> engages in is at least two orders of magnitude more
> David> complex than transport layer processing.  I.e. for
> David> every byte of OSPF traffic a router receives, it may
> David> spend 10 cycles to encapsulate it in TCP,  but it
> David> will probably spend 1,000 cycles for the associated
> David> SPF calculation.  Reducing the transport overhead
> David> from 10 cycles to 1 cycle won't actually affect the
> David> router performance in any way...
>

I agree, the implications maybe highly exagerated - however, if you
were to look at the paths the two approaches take it is clear
they will perform relatively differently.
i.e
In the VLAN example i described above, the packet is shunted within
hardware never seeing the s/ware.
In the case you encapsulate with TCP etc, you have to cross fabric
to CPU and depending on OS you cross from one protection domain to
another and then reverse again (userspace->kernel->fabric --> CE)

I am actually not against using a protocol _but_ as i mentioned
earlier i am not for mandating it either, for practical reasons.
If you gave me a choice between encapsulating on some IP transport
protocol and using VLANs when i have hardware that can do it i would do
the later. I have a feeling that most will.

cheers,
jamal


2005
Message-Id: <MON.14.MAR.2005.053228.0500.>
Date: Mon, 14 Mar 2005 05:32:28 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: ZNYX Networks
Subject: Re: FE-CE data path
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

Joel,

I missed one subtle thing from your earlier email which became obvious
reading Furquans last email - in that we are only talking about data
"channel".

Yes i was suggesting SCTP-PR instead of DCCP. I wouldnt call it
non-retransmiting; however it is tunable to remove HOL.

However, upon further reflection, even i would not advocate the
mandatory use of SCTP-PR in this case.

My reasons are slightly different than what Furquan and Shuchi: I do
think issues they faced of "reliability tunings" such as timers mismatch
etc that result in HOL, can be overcome with SCTP-PR/UDP/DCCP (but not
TCP).
However, I dont think that we can force an implementation scheme.
A lot of commodity hardware exists that can encapsulate the data
channel packets in some header such as GRE, VLAN etc. Enforcing that
such packets MUST be encapsulated in SCTP is going to be a perfomance
problem and not very practical.

cheers,
jamal

On Tue, 2005-03-15 at 16:04, Joel M. Halpern wrote:
> I think that there is a different issue.
> TCP and SCTOP will both choose to provide retransmission.
> For the data channel, we want adaptive congestion control (rate limiting)
> with dropping of old packets.  We do not want ever want data channel
> packets retransmited.
>
> In contrast, the control channel actually requires retransmission for
> reliability.
>
> Are you suggesting a non-retransmitting mode of SCTP as an alternative to
> DCCP for the data channel?
> If so, I would be interested in the details of what that mode does.  (Also,
> since most of us associated SCTP with the reliable mode, I at least jumped
> to the conclusion you meant reliable SCTP when you initially suggested SCTP
> without a qualifier.)
>
> Yours,
> Joel
>
> At 04:26 AM 3/14/2005, Jamal Hadi Salim wrote:
> >The real problem is not _reliability_ as provided by TCP - rather the
> >Head of Line Blocking presented by TCP (which is clearly visible when
> >you run a reliable protocol on top of it such as mentioned OSPF).
> >
> >PR-SCTP resolves this. Look at RFC 3758.
> >
> >cheers,
> >jamal


2005
Message-Id: <MON.14.MAR.2005.042654.0500.>
Date: Mon, 14 Mar 2005 04:26:54 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: ZNYX Networks
Subject: Re: FE-CE data path
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

The real problem is not _reliability_ as provided by TCP - rather the
Head of Line Blocking presented by TCP (which is clearly visible when
you run a reliable protocol on top of it such as mentioned OSPF).

PR-SCTP resolves this. Look at RFC 3758.

cheers,
jamal

On Tue, 2005-03-15 at 15:09, Khosravi, Hormuzd M wrote:
> -----Original Message-----
> From: Forwarding and Control Element Separation
> [mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Tolga Asveren
> >
> > Ive mentioned SCTP a few times so far as an alternative.
> [TOLGA]If reliability is provided externally -by running TCP/SCTP etc...
> on
> service endpoints, and I think this is assumed in the context of this
> discussion-, wouldn't SCTP also an overkill, afterall it also would
> provide
> an additonal layer of reliability, which would consume computing
> resources?
> For such a setup, the only problem I see with UDP is lack of congestion
> control, which is the reason for DCCP.
>
> [HK] I agree, there is no difference between using TCP or SCTP for the
> data channel. They both have the same problems. What is fundamentally
> needed is unreliable transport with congestion control. DCCP fits this
> perfectly. The only problem I have with DCCP is that there are no
> running stacks right now which are compliant with the latest specs. I
> have tested some of the older stacks which are available but they are
> not stable either. So yes, it is getting close to RFC status but without
> any running code...which surprises me!
>
> The other option which comes to mind is what Joel proposed, using UDP or
> some kind of tunneling with some rate control mechanisms. I have my
> doubts whether this will work, similar to what Joel expressed.
>
>
> regards
> Hormuzd


2005
Message-Id: <MON.14.MAR.2005.031604.0500.>
Date: Mon, 14 Mar 2005 03:16:04 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: ZNYX Networks
Subject: Re: FE-CE data path
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

On Tue, 2005-03-15 at 11:37, Joel M. Halpern wrote:
> In the TML document there is a very clear discussion of the tradeoffs in
> using various protocols for forwarding data packets between the FE and the
> CE (in either direction.)
> After the meeting, I chatted with the document authors a bit, as they had
> found some interesting issues that were not mentioned in the draft.
>
> For example, they quite correctly pointed out that forwarding IP packets
> which are part of an external reliability scheme (TCP or OSPF
> retransmission, or  ...) over TCP can produce some quite interesting problems.
>
> Later, I was chatting with one of our chairs who also pointed out that
> forwarding TCP over TCP is not a good idea.
>

Glad this is being understood.
[At least I hope not to be chased around anymore with baseball bats for
being against TCP].

> However, the data channel can induce congestion.  And that congestion can
> have very severe impacts on the control channel.  Particularly since the
> control channel will slow down in the presence of congestion.
>
> We could try to craft a multi-part scheme with configured rates, some data
> traffic over TCP and some over UDP, and some additional feedback to try to
> keep the whole thing in balance.  The odds are it won't work right.
>
> Given these choices, and given other external developments, I would like to
> raises a question that has been discussed and agreed in the past.  (The
> chairs can tell me there is not enough external change and I should shut
> up.)  DCCP is nearing IESG approval.  I am told that there are DCCP stacks
> available.  Would it make more sense for us to simply use DCCP for our
> mandatory-to-implement FE-CE data channel protocol?  (This does not
> prohibit other protocols / encapsulations for suitable environments.)
>

Ive mentioned SCTP a few times so far as an alternative.

We (Weiming, Robert, Alex and myself) are working on a SCTP based TML
to replace the old draft we had. We will be putting out a draft soon.

Both SCTP and DCCP are still newish. However, SCTP is far more widely
deployed. The only missing "feature" from the SCTP swiss knife is
multicast. There maybe need for the TML to deploy UDP in addition when
multicast is needed.

cheers,
jamal


2005
Message-Id: <FRI.11.MAR.2005.200053.0000.>
Date: Fri, 11 Mar 2005 20:00:53 +0000
From: Ellen M Deleganes <tracker-forces@mip4.org>
Subject: [issue20] Editorial - Section 4
Content-Type: text/plain; charset=utf-8
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

New submission from Ellen M Deleganes <ellen.m.deleganes@intel.com>:

1) Section 4.5=20

a) says dataTypeDefs is used to define metadata.=20
I dont think this is accurate since you have metadataDef for that
purpose

b) the text says boolean has a "0" or "1" value but the schema has a
"yes" or "no" value

2)  4.5.3; The example at the end has "source" which is a 16bit value.
I couldnt tell what that was from the text. Was the intent to have a 32
bit value?

3) 4.7.4
Bullet "Metadata CONSUME/PROPAGATE mode selector" is repeated=20


4) 5.1. XML for FEObject Class definition

a) LFBLinkType still refers to LFBSelector, rather than LFBSelectorType.

b) The String type is sometimes capitalized, sometimes not.

c) Missed capitalization and typos in variable names: Operenable,
interfaceToNeighbor, neighborNetworkAddress, neighborMACAdddress.

d) Extra spaces inside <name> tags: AdminDisable, Operenable, Read-Only.
More annoyances than anything when parsing using libxml.

5) section 1.  Definitions

This was actually caught by Alistair Munro on the protocol draft but
applies here as well. You need to reword what LFB stands for now that we
have Core LFBs which really do not sit on the forwarding path.

----------
category: Editorial
draft: draft-ietf-forces-model
messages: 36
nosy: ellen
priority: Should fix
status: No discussion
title: Editorial - Section 4

___________________________________________________
Forces issue tracker <tracker-forces@mip4.org>
<http://www.mip4.org/issues/tracker/forces/issue20>
___________________________________________________


2005
Message-Id: <THU.10.MAR.2005.230330.0500.>
Date: Thu, 10 Mar 2005 23:03:30 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: Attribute information
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

Exactly.
Thanks.  Joel

At 10:17 PM 3/10/2005, Jamal Hadi Salim wrote:
>Joel,
>
>Looks palatable to me. Protocol wise - a GET with that flag you
>mentioned earlier to the path to, say, an alias would imply you want
>to get the alias_attribute_info, correct?
>
>cheers,
>jamal
>
>On Wed, 2005-03-09 at 21:06, Joel M. Halpern wrote:
> > I had originally envisioned that this would only be used with GET
> operations.
> > However, if we allow setting some fields, the ALIAS mecahnism becomes much
> > simpler.
> >
> > So the basic definition (not in XML, without the element identifiers) is
> > atomic_attribute_info: structure
> >      permissions; permission_scalar (not_supported, read_only, write_only,
> > read_write)
> >    end
> >
> > then we get
> > array_attribute_info: structure derived from atomic_attribute_info
> >      first_used_index: uint32
> >      last_used_index: uint32
> >      first_empty_entry: uint32
> >      used_entry_count: uint32
> >      supported_content_keys: array of uint32 (contents are key_ids)
> >    end
> > and also
> > string_attribute_info: structure derived from atomic_attribute_info
> >      actual_string_length: uint32
> >    end
> >
> > and if we allow writing, then for alias elements we get
> > alias_attribute_info: structure derived from atomic_attribute_info
> >      target_lfb_class: uint32
> >      target_lfb_instance: uint32
> >      target_path: variable_octet_string
> >    end
> >
> > Yours,
> > Joel
> >
> > At 12:26 PM 3/9/2005, Jamal Hadi Salim wrote:
> > >Joel,
> > >
> > >On Wed, 2005-03-09 at 10:03, Joel M. Halpern wrote:
> > > > At the meeting, I discussed the question of how to represent
> information
> > > > about permissions and capabilities of LFB attributes, structure
> > > elements, etc.
> > > >
> > > > Currently, we have LFB capabilities which are defined purely by the LFB
> > > > class definition, and may tell you something about which attributes are
> > > > supported and what permissions exist for them.  But it is not a general
> > > > mechanism.  It does not handle arrays usefully.  It does not handle
> > > > structure elements.
> > > >
> > > > So, the suggestion I made (which is derived from discussions with model
> > > > team members, but has not been reviewed by them) was to use the
> path flags
> > > > to allow a GET or SET operation to reference information about an
> > > attribute
> > > > or element (a path target) instead of the element itself.
> > > >
> > >
> > >Sounds reasonable. So the flag says "this contains metadata about the
> > >target in this path"
> > >
> > > > The "type" of the value of such a reference would be a structure
> based on
> > > > the type of the target element.  The basic structure would have a
> single
> > > > element representing the permissions, with a scalar representing
> > > > unsupported, read only, write only, and read / write.
> > > > There would be subtypes of this types for defined atomic types.
> > > > Strings would have a length element.
> > > > arrays would have information on the number of entries, first used
> entry,
> > > > first unused entry, and highest used subscript.  (It is not clear to me
> > > > whether the ability to create / delete array entries is the read-write
> > > > property of the array, or if read-write refers to array entries and we
> > > need
> > > > a separate create / delete.)
> > > > The information about where Aliases point would be moved here
> instead of a
> > > > synthetic structure in the data, simplifying using aliases.
> > > >
> > > > Does this make sense to people?
> > > > Is it a good idea?
> > >
> > >Clearly theres need to set things like ACL for an attribute etc.
> > >There are some things which i think you do NOT want people to change:
> > >like the ID - which in the latest draft is now metadata aka
> > >xml-attribute. And i am also not sure it would make any sense for some
> > >things to be even gettable - why would you want to get the ID of an
> > >attribute? (I am almost having second thoughts of whether the ID should
> > >stay as metadata - but thats a different discussion).
> > >
> > >Also i am not sure how what you meant by strings etc being transported.
> > >
> > >Having said that i think this is a good idea - please post some
> > >examples.
> > >
> > >cheers,
> > >jamal


2005
Message-Id: <THU.10.MAR.2005.221727.0500.>
Date: Thu, 10 Mar 2005 22:17:27 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: ZNYX Networks
Subject: Re: Attribute information
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

Joel,

Looks palatable to me. Protocol wise - a GET with that flag you
mentioned earlier to the path to, say, an alias would imply you want
to get the alias_attribute_info, correct?

cheers,
jamal

On Wed, 2005-03-09 at 21:06, Joel M. Halpern wrote:
> I had originally envisioned that this would only be used with GET operations.
> However, if we allow setting some fields, the ALIAS mecahnism becomes much
> simpler.
>
> So the basic definition (not in XML, without the element identifiers) is
> atomic_attribute_info: structure
>      permissions; permission_scalar (not_supported, read_only, write_only,
> read_write)
>    end
>
> then we get
> array_attribute_info: structure derived from atomic_attribute_info
>      first_used_index: uint32
>      last_used_index: uint32
>      first_empty_entry: uint32
>      used_entry_count: uint32
>      supported_content_keys: array of uint32 (contents are key_ids)
>    end
> and also
> string_attribute_info: structure derived from atomic_attribute_info
>      actual_string_length: uint32
>    end
>
> and if we allow writing, then for alias elements we get
> alias_attribute_info: structure derived from atomic_attribute_info
>      target_lfb_class: uint32
>      target_lfb_instance: uint32
>      target_path: variable_octet_string
>    end
>
> Yours,
> Joel
>
> At 12:26 PM 3/9/2005, Jamal Hadi Salim wrote:
> >Joel,
> >
> >On Wed, 2005-03-09 at 10:03, Joel M. Halpern wrote:
> > > At the meeting, I discussed the question of how to represent information
> > > about permissions and capabilities of LFB attributes, structure
> > elements, etc.
> > >
> > > Currently, we have LFB capabilities which are defined purely by the LFB
> > > class definition, and may tell you something about which attributes are
> > > supported and what permissions exist for them.  But it is not a general
> > > mechanism.  It does not handle arrays usefully.  It does not handle
> > > structure elements.
> > >
> > > So, the suggestion I made (which is derived from discussions with model
> > > team members, but has not been reviewed by them) was to use the path flags
> > > to allow a GET or SET operation to reference information about an
> > attribute
> > > or element (a path target) instead of the element itself.
> > >
> >
> >Sounds reasonable. So the flag says "this contains metadata about the
> >target in this path"
> >
> > > The "type" of the value of such a reference would be a structure based on
> > > the type of the target element.  The basic structure would have a single
> > > element representing the permissions, with a scalar representing
> > > unsupported, read only, write only, and read / write.
> > > There would be subtypes of this types for defined atomic types.
> > > Strings would have a length element.
> > > arrays would have information on the number of entries, first used entry,
> > > first unused entry, and highest used subscript.  (It is not clear to me
> > > whether the ability to create / delete array entries is the read-write
> > > property of the array, or if read-write refers to array entries and we
> > need
> > > a separate create / delete.)
> > > The information about where Aliases point would be moved here instead of a
> > > synthetic structure in the data, simplifying using aliases.
> > >
> > > Does this make sense to people?
> > > Is it a good idea?
> >
> >Clearly theres need to set things like ACL for an attribute etc.
> >There are some things which i think you do NOT want people to change:
> >like the ID - which in the latest draft is now metadata aka
> >xml-attribute. And i am also not sure it would make any sense for some
> >things to be even gettable - why would you want to get the ID of an
> >attribute? (I am almost having second thoughts of whether the ID should
> >stay as metadata - but thats a different discussion).
> >
> >Also i am not sure how what you meant by strings etc being transported.
> >
> >Having said that i think this is a good idea - please post some
> >examples.
> >
> >cheers,
> >jamal


2005
Message-Id: <THU.10.MAR.2005.163332.0800.>
Date: Thu, 10 Mar 2005 16:33:32 -0800
From: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
Subject: IETF meeting minutes?
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C525D1.F4DD7783"

This is a multi-part message in MIME format.

------_=_NextPart_001_01C525D1.F4DD7783
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Could someone send out an initial draft of the IETF ForCES WG meeting
minutes ?
=20
=20
Thanks
Hormuzd
=20

------_=_NextPart_001_01C525D1.F4DD7783
Content-Type: text/html;
	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dus-ascii">
<META content=3D"MSHTML 6.00.2800.1480" name=3DGENERATOR></HEAD>
<BODY>
<DIV><SPAN class=3D323133200-11032005><FONT face=3DArial size=3D2>Could =
someone send=20
out an initial draft of the IETF ForCES WG meeting minutes =
?</FONT></SPAN></DIV>
<DIV><SPAN class=3D323133200-11032005><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D323133200-11032005><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D323133200-11032005><FONT face=3DArial=20
size=3D2>Thanks</FONT></SPAN></DIV>
<DIV><SPAN class=3D323133200-11032005><FONT face=3DArial=20
size=3D2>Hormuzd</FONT></SPAN></DIV>
<DIV><SPAN class=3D323133200-11032005><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV></BODY></HTML>

------_=_NextPart_001_01C525D1.F4DD7783--


2005
Message-Id: <WED.9.MAR.2005.210644.0500.>
Date: Wed, 9 Mar 2005 21:06:44 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: Attribute information
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

I had originally envisioned that this would only be used with GET operations.
However, if we allow setting some fields, the ALIAS mecahnism becomes much
simpler.

So the basic definition (not in XML, without the element identifiers) is
atomic_attribute_info: structure
     permissions; permission_scalar (not_supported, read_only, write_only,
read_write)
   end

then we get
array_attribute_info: structure derived from atomic_attribute_info
     first_used_index: uint32
     last_used_index: uint32
     first_empty_entry: uint32
     used_entry_count: uint32
     supported_content_keys: array of uint32 (contents are key_ids)
   end
and also
string_attribute_info: structure derived from atomic_attribute_info
     actual_string_length: uint32
   end

and if we allow writing, then for alias elements we get
alias_attribute_info: structure derived from atomic_attribute_info
     target_lfb_class: uint32
     target_lfb_instance: uint32
     target_path: variable_octet_string
   end

Yours,
Joel

At 12:26 PM 3/9/2005, Jamal Hadi Salim wrote:
>Joel,
>
>On Wed, 2005-03-09 at 10:03, Joel M. Halpern wrote:
> > At the meeting, I discussed the question of how to represent information
> > about permissions and capabilities of LFB attributes, structure
> elements, etc.
> >
> > Currently, we have LFB capabilities which are defined purely by the LFB
> > class definition, and may tell you something about which attributes are
> > supported and what permissions exist for them.  But it is not a general
> > mechanism.  It does not handle arrays usefully.  It does not handle
> > structure elements.
> >
> > So, the suggestion I made (which is derived from discussions with model
> > team members, but has not been reviewed by them) was to use the path flags
> > to allow a GET or SET operation to reference information about an
> attribute
> > or element (a path target) instead of the element itself.
> >
>
>Sounds reasonable. So the flag says "this contains metadata about the
>target in this path"
>
> > The "type" of the value of such a reference would be a structure based on
> > the type of the target element.  The basic structure would have a single
> > element representing the permissions, with a scalar representing
> > unsupported, read only, write only, and read / write.
> > There would be subtypes of this types for defined atomic types.
> > Strings would have a length element.
> > arrays would have information on the number of entries, first used entry,
> > first unused entry, and highest used subscript.  (It is not clear to me
> > whether the ability to create / delete array entries is the read-write
> > property of the array, or if read-write refers to array entries and we
> need
> > a separate create / delete.)
> > The information about where Aliases point would be moved here instead of a
> > synthetic structure in the data, simplifying using aliases.
> >
> > Does this make sense to people?
> > Is it a good idea?
>
>Clearly theres need to set things like ACL for an attribute etc.
>There are some things which i think you do NOT want people to change:
>like the ID - which in the latest draft is now metadata aka
>xml-attribute. And i am also not sure it would make any sense for some
>things to be even gettable - why would you want to get the ID of an
>attribute? (I am almost having second thoughts of whether the ID should
>stay as metadata - but thats a different discussion).
>
>Also i am not sure how what you meant by strings etc being transported.
>
>Having said that i think this is a good idea - please post some
>examples.
>
>cheers,
>jamal


2005
Message-Id: <WED.9.MAR.2005.192211.0800.>
Date: Wed, 9 Mar 2005 19:22:11 +0800
From: "Wang,Weiming" <wmwang@mail.zjgsu.edu.cn>
Subject: Re: Hearbeat piggy-backing, and typos in protocol draft

Hi Haleplidis Evangelos,

Thank you for the comments. Just reply with my own views regarding your thoughts
inline.

Cheers,
Weiming

----- Original Message -----
From: "Evangelos Haleplidis" <ehalep@ee.upatras.gr>
Subject: Hearbeat piggy-backing, and typos in protocol draft


>
> - It would be good to support some sort of piggy-backing of heartbeats
> over other messages. When a PL message arrives at an element, this may
> also be treated as a PL heartbeat, as it shows that the sender is indeed
> alive.
>
> -  The FE Protocol LFB should have a flag to control this option, so that
> the FE knows whether it has to send hearbeat messages periodically, or if
> it can skip sending them whenever PL messages have just been sent.
Yes, I think it is valuable to have a try to exploit the generic heartbeat
function from general protocol messages to save resources. It's actually not
very comlex to realize the scheme. To have a heartbeat message acts only as a
gap filler between messages with longer time interval than a predefined period,
and to let the scheme as only one of several heartbeat policies.
I hope this view can be considered by protocol team.


2005
Message-Id: <WED.9.MAR.2005.184607.0000.>
Date: Wed, 9 Mar 2005 18:46:07 +0000
From: Ellen M Deleganes <tracker-forces@mip4.org>
Subject: [issue19] LFBClassCapabilities missing from the definitions
Content-Type: text/plain; charset=utf-8
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

New submission from Ellen M Deleganes <ellen.m.deleganes@intel.com>:

LFBClassCapabilities has a subheading with a short synopsis but does not=20
appear in the definition because the author did now know how to write it.

----------
category: Technical
draft: draft-ietf-forces-model
messages: 35
nosy: ellen
priority: Must fix
status: No discussion
title: LFBClassCapabilities missing from the definitions

___________________________________________________
Forces issue tracker <tracker-forces@mip4.org>
<http://www.mip4.org/issues/tracker/forces/issue19>
___________________________________________________


2005
Message-Id: <WED.9.MAR.2005.183850.0000.>
Date: Wed, 9 Mar 2005 18:38:50 +0000
From: Ellen M Deleganes <tracker-forces@mip4.org>
Subject: [issue18] Editorial - XML typos
Content-Type: text/plain; charset=utf-8
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

New submission from Ellen M Deleganes <ellen.m.deleganes@intel.com>:

The following typos in the XML schema were pointed out by Evangelos Halepli=
dis:
1) Page 64
type=3D"rangeRestrictionType minOccurs=3D"0"/>
--------------------------^
type=3D"rangeRestrictionType" minOccurs=3D"0"/>

2) Page 65
<xsd:element name=3D"keyField" maxOccurs=3D"unbound"
-----------------------------------------------^
<xsd:element name=3D"keyField" maxOccurs=3D"unbounded"

3) Page 65
<!-declare keys to have unique IDs -->
--^
<!--declare keys to have unique IDs -->

4) Page 67
<! - does the above ensure that attributes and capabilities
---^
<!-- does the above ensure that attributes and capabilities

5) Page 67
Two lines down after typo No4, there seems to be missing a closing comment
tag: -->

6) Page 65
The key declarations, for which the comments are as follows, are not
accepted by the XML parser:
a) <!-- declare keys to have unique IDs -->
b) <!-- key declaration to make elementIDs unique in a struct --> In order
for the XML parser to accept the key declarations, they must be moved
inside the element declaration. i.e.

a)
<xsd:element name=3D"key" maxOccurs=3D"unbounded">
	<xsd:complexType>
		<xsd:sequence>
			<xsd:element name=3D"keyField" type=3D"xsd:string"=20
maxOccurs=3D"unbounded"/>
		</xsd:sequence>
		<xsd:attribute name=3D"keyID" type=3D"xsd:integer" use=3D"required"/>
	</xsd:complexType>
	<!-- declare keys to have unique IDs -->
	<xsd:key name=3D"keyID">
		<xsd:selector xpath=3D"lfb:key"/>
		<xsd:field xpath=3D"@keyID"/>
	</xsd:key>
</xsd:element>

b)
<xsd:element name=3D"element" maxOccurs=3D"unbounded">
	<xsd:complexType>
		<xsd:sequence>
			<xsd:element name=3D"name" type=3D"xsd:NMTOKEN"/>
			<xsd:element ref=3D"synopsis"/>
			<xsd:element name=3D"optional" minOccurs=3D"0"/>
			<xsd:group ref=3D"typeDeclarationGroup"/>
		</xsd:sequence>
		<xsd:attribute name=3D"elementID" type=3D"xsd:integer"=20
use=3D"required"/>
	</xsd:complexType>
	<!-- key declaration to make elementIDs unique in a struct -->
	<xsd:key name=3D"structElementID">
		<xsd:selector xpath=3D"lfb:element"/>
		<xsd:field xpath=3D"@elementID"/>
	</xsd:key>
</xsd:element>

----------
category: Editorial
draft: draft-ietf-forces-model
messages: 34
nosy: ellen
priority: Must fix
status: No discussion
title: Editorial - XML typos

___________________________________________________
Forces issue tracker <tracker-forces@mip4.org>
<http://www.mip4.org/issues/tracker/forces/issue18>
___________________________________________________


2005
Message-Id: <WED.9.MAR.2005.183113.0000.>
Date: Wed, 9 Mar 2005 18:31:13 +0000
From: Ellen M Deleganes <tracker-forces@mip4.org>
Subject: [issue17] Expressing default values for byte[N] atomic types
Content-Type: text/plain; charset=utf-8
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

New submission from Ellen M Deleganes <ellen.m.deleganes@intel.com>:

How to express default values for byte[N] atomic types is yet to be defined.

----------
category: Technical
draft: draft-ietf-forces-model
messages: 32
nosy: ellen
priority: Should fix
status: No discussion
title: Expressing default values for byte[N] atomic types

___________________________________________________
Forces issue tracker <tracker-forces@mip4.org>
<http://www.mip4.org/issues/tracker/forces/issue17>
___________________________________________________


2005
Message-Id: <WED.9.MAR.2005.182935.0000.>
Date: Wed, 9 Mar 2005 18:29:35 +0000
From: Ellen M Deleganes <tracker-forces@mip4.org>
Subject: [issue16] Class derivation rules
Content-Type: text/plain; charset=utf-8
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

New submission from Ellen M Deleganes <ellen.m.deleganes@intel.com>:

The <derivedFrom> element will likely need to specify the version of the=20
ancestor, which is not included in the schema yet.  The process and rules o=
f=20
class derivation are still being studied.

----------
category: Technical
draft: draft-ietf-forces-model
messages: 31
nosy: ellen
priority: Should fix
status: No discussion
title: Class derivation rules

___________________________________________________
Forces issue tracker <tracker-forces@mip4.org>
<http://www.mip4.org/issues/tracker/forces/issue16>
___________________________________________________


2005
Message-Id: <WED.9.MAR.2005.182742.0000.>
Date: Wed, 9 Mar 2005 18:27:42 +0000
From: Ellen M Deleganes <tracker-forces@mip4.org>
Subject: [issue15] LFB class name uniqueness
Content-Type: text/plain; charset=utf-8
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

New submission from Ellen M Deleganes <ellen.m.deleganes@intel.com>:

LFB class names should be unique not only among classes defined in this=20
document and in all included documents, but also unique across a large=20
collection of libraries.  Obviously some global control is needed to ensure=20
such uniqueness.  This subject requires further study.  The uniqueness of t=
he=20
class IDs also requires further study.

----------
category: Technical
draft: draft-ietf-forces-model
messages: 30
nosy: ellen
priority: Should fix
status: No discussion
title: LFB class name uniqueness

___________________________________________________
Forces issue tracker <tracker-forces@mip4.org>
<http://www.mip4.org/issues/tracker/forces/issue15>
___________________________________________________


2005
Message-Id: <WED.9.MAR.2005.182607.0000.>
Date: Wed, 9 Mar 2005 18:26:07 +0000
From: Ellen M Deleganes <tracker-forces@mip4.org>
Subject: [issue14] XML does not enforce typeRef to be atomic type
Content-Type: text/plain; charset=utf-8
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

New submission from Ellen M Deleganes <ellen.m.deleganes@intel.com>:

The usage of typeRef is restricted to atomic types, but this is not current=
ly=20
enforced by the XML.

----------
category: Technical
draft: draft-ietf-forces-model
messages: 29
nosy: ellen
priority: May fix
status: No discussion
title: XML does not enforce typeRef to be atomic type

___________________________________________________
Forces issue tracker <tracker-forces@mip4.org>
<http://www.mip4.org/issues/tracker/forces/issue14>
___________________________________________________


2005
Message-Id: <WED.9.MAR.2005.182326.0000.>
Date: Wed, 9 Mar 2005 18:23:26 +0000
From: Ellen M Deleganes <tracker-forces@mip4.org>
Subject: [issue13] Augmentations
Content-Type: text/plain; charset=utf-8
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

New submission from Ellen M Deleganes <ellen.m.deleganes@intel.com>:

A proposal was made in the -04- draft on how to handle structure augmentati=
on.=20
Please review and comment as appropriate.

----------
category: Technical
draft: draft-ietf-forces-model
messages: 28
nosy: ellen
priority: May fix
status: No discussion
title: Augmentations

___________________________________________________
Forces issue tracker <tracker-forces@mip4.org>
<http://www.mip4.org/issues/tracker/forces/issue13>
___________________________________________________


2005
Message-Id: <WED.9.MAR.2005.164522.0000.>
Date: Wed, 9 Mar 2005 16:45:22 +0000
From: Avri Doria <tracker-forces@mip4.org>
Subject: [issue12] Editorial  re; Pge 21, 29
Content-Type: text/plain; charset=utf-8
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

New submission from Avri Doria <avri@acm.org>:

submitted by Haleplidis Evangelos


Page 21
-------
Command (8 bits)
//Needs to be changed to
Message Type (8 bits)

Page 29
--------
"The RAWDATA's V will only contain the content SANS the..."
The word SANS is the French "without" or something else?

Regards,

----------
category: Editorial
draft: draft-ietf-forces-protocol
messages: 27
nosy: avri
priority: Must fix
status: No discussion
title: Editorial  re; Pge 21, 29

___________________________________________________
Forces issue tracker <tracker-forces@mip4.org>
<http://www.mip4.org/issues/tracker/forces/issue12>
___________________________________________________


2005
Message-Id: <WED.9.MAR.2005.164201.0000.>
Date: Wed, 9 Mar 2005 16:42:01 +0000
From: Avri Doria <tracker-forces@mip4.org>
Subject: [issue11] Hearbeat piggy-backing=?utf-8?Q?=0A=0A-_It_would_be_good_to_support_some_sort_of_piggy-backing_of_heartbeats=0Aover_other_messages._When_a_PL_message_arrives_at_an_element,_this_may=0Aalso_be_treated_as_a_PL_heartbeat,_as_it_shows_that_the_sender_is_indeed=0Aalive.=0A=0A-__The_FE_Protocol_LFB_should_have_a_flag_to_control_this_option,_so_that=0Athe_FE_knows_whether_it_has_to_send_hearbeat_messages_periodically,_or_if=0Ait_can_skip_sending_them_whenever_PL_messages_have_just_been_sent.=0AHearbeat_piggy-backing=0A=0A-_It_would_be_good_to_support_some_sort_of_piggy-backing_of_heartbeats=0Aover_other_messages._When_a_PL_message_arrives_at_an_element,_this_may=0Aalso_be_treated_as_a_PL_heartbeat,_as_it_shows_that_the_sender_is_indeed=0Aalive.=0A=0A-__The_FE_Protocol_LFB_should_have_a_flag_to_control_this_option,_so_that=0Athe_FE_knows_whether_it_has_to_send_hearbeat_messages_periodically,_or_if=0Ait_can_skip_sending_them_whenever_PL_messages_have_just_been_sent._=0AHeartbeats ?= and piggy back
Content-Type: text/plain; charset=utf-8
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

New submission from Avri Doria <avri@acm.org>:

Submitted by Haleplidis Evangelos

- It would be good to support some sort of piggy-backing of heartbeats
over other messages. When a PL message arrives at an element, this may
also be treated as a PL heartbeat, as it shows that the sender is indeed
alive.

-  The FE Protocol LFB should have a flag to control this option, so that
the FE knows whether it has to send hearbeat messages periodically, or if
it can skip sending them whenever PL messages have just been sent.


Response from Weiming Wang

Yes, I think it is valuable to have a try to exploit the generic heartbeat
function from general protocol messages to save resources. It's actually not
very comlex to realize the scheme. To have a heartbeat message acts only as=
 a
gap filler between messages with longer time interval than a predefined per=
iod,
and to let the scheme as only one of several heartbeat policies.
I hope this view can be considered by protocol team.

----------
category: Technical
draft: draft-ietf-forces-protocol
messages: 26
nosy: avri
priority: May fix
status: Pending
title: Hearbeat piggy-backing

- It would be good to support some sort of piggy-backing of heartbeats
over other messages. When a PL message arrives at an element, this may
also be treated as a PL heartbeat, as it shows that the sender is indeed
alive.

-  The FE Protocol LFB should have a flag to control this option, so that
the FE knows whether it has to send hearbeat messages periodically, or if
it can skip sending them whenever PL messages have just been sent.
Hearbeat piggy-backing

- It would be good to support some sort of piggy-backing of heartbeats
over other messages. When a PL message arrives at an element, this may
also be treated as a PL heartbeat, as it shows that the sender is indeed
alive.

-  The FE Protocol LFB should have a flag to control this option, so that
the FE knows whether it has to send hearbeat messages periodically, or if
it can skip sending them whenever PL messages have just been sent.
Heartbeats and piggy back

___________________________________________________
Forces issue tracker <tracker-forces@mip4.org>
<http://www.mip4.org/issues/tracker/forces/issue11>
___________________________________________________


2005
Message-Id: <WED.9.MAR.2005.123644.0200.>
Date: Wed, 9 Mar 2005 12:36:44 +0200
From: Evangelos Haleplidis <ehalep@ee.upatras.gr>
Subject: XML model
MIME-Version: 1.0
Content-Type: text/plain;charset=iso-8859-7
Content-Transfer-Encoding: 8bit

Greetings again to the list,

I have read the Model draft (-04 version) and used the XML Spy parser to
have a better view of the XML schema, and found the following typos:

1) Page 64
type="rangeRestrictionType minOccurs="0"/>
--------------------------^
type="rangeRestrictionType" minOccurs="0"/>

2) Page 65
<xsd:element name="keyField" maxOccurs="unbound"
-----------------------------------------------^
<xsd:element name="keyField" maxOccurs="unbounded"

3) Page 65
<!-declare keys to have unique IDs -->
--^
<!--declare keys to have unique IDs -->

4) Page 67
<! - does the above ensure that attributes and capabilities
---^
<!-- does the above ensure that attributes and capabilities

5) Page 67
Two lines down after typo No4, there seems to be missing a closing comment
tag: -->

6) Page 65
The key declarations, for which the comments are as follows, are not
accepted by the XML parser:
a) <!-- declare keys to have unique IDs -->
b) <!-- key declaration to make elementIDs unique in a struct --> In order
for the XML parser to accept the key declarations, they must be moved
inside the element declaration. i.e.

a)
<xsd:element name="key" maxOccurs="unbounded">
	<xsd:complexType>
		<xsd:sequence>
			<xsd:element name="keyField" type="xsd:string" maxOccurs="unbounded"/>
		</xsd:sequence>
		<xsd:attribute name="keyID" type="xsd:integer" use="required"/>
	</xsd:complexType>
	<!-- declare keys to have unique IDs -->
	<xsd:key name="keyID">
		<xsd:selector xpath="lfb:key"/>
		<xsd:field xpath="@keyID"/>
	</xsd:key>
</xsd:element>

b)
<xsd:element name="element" maxOccurs="unbounded">
	<xsd:complexType>
		<xsd:sequence>
			<xsd:element name="name" type="xsd:NMTOKEN"/>
			<xsd:element ref="synopsis"/>
			<xsd:element name="optional" minOccurs="0"/>
			<xsd:group ref="typeDeclarationGroup"/>
		</xsd:sequence>
		<xsd:attribute name="elementID" type="xsd:integer" use="required"/>
	</xsd:complexType>
	<!-- key declaration to make elementIDs unique in a struct -->
	<xsd:key name="structElementID">
		<xsd:selector xpath="lfb:element"/>
		<xsd:field xpath="@elementID"/>
	</xsd:key>
</xsd:element>

Regards,
Evangelos Haleplidis.


2005
Message-Id: <WED.9.MAR.2005.123526.0200.>
Date: Wed, 9 Mar 2005 12:35:26 +0200
From: Evangelos Haleplidis <ehalep@ee.upatras.gr>
Subject: Hearbeat piggy-backing, and typos in protocol draft
MIME-Version: 1.0
Content-Type: text/plain;charset=iso-8859-7
Content-Transfer-Encoding: 8bit

Greetings to the list,

I'm a Ph.D student at the University of Patras, and I'm currently working
on a prototype implementation of the ForCES protocol in the scope of the
EU FlexiNET project.

My implementation includes at this point association setup and heartbeat
exchanges between a CE and an FE without any LFBs involved (still using
the -01 version of protocol). I had a few comments about the heartbeats:

- It would be good to support some sort of piggy-backing of heartbeats
over other messages. When a PL message arrives at an element, this may
also be treated as a PL heartbeat, as it shows that the sender is indeed
alive.

-  The FE Protocol LFB should have a flag to control this option, so that
the FE knows whether it has to send hearbeat messages periodically, or if
it can skip sending them whenever PL messages have just been sent.

Also, while reading the ForCES protocol draft (-02 version), I found two
typos:

Page 21
-------
Command (8 bits)
//Needs to be changed to
Message Type (8 bits)

Page 29
--------
"The RAWDATA's V will only contain the content SANS the..."
The word SANS is the French "without" or something else?

Regards,
Haleplidis Evangelos


2005
Message-Id: <WED.9.MAR.2005.122605.0500.>
Date: Wed, 9 Mar 2005 12:26:05 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: Znyx Networks
Subject: Re: Attribute information
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

Joel,

On Wed, 2005-03-09 at 10:03, Joel M. Halpern wrote:
> At the meeting, I discussed the question of how to represent information
> about permissions and capabilities of LFB attributes, structure elements, etc.
>
> Currently, we have LFB capabilities which are defined purely by the LFB
> class definition, and may tell you something about which attributes are
> supported and what permissions exist for them.  But it is not a general
> mechanism.  It does not handle arrays usefully.  It does not handle
> structure elements.
>
> So, the suggestion I made (which is derived from discussions with model
> team members, but has not been reviewed by them) was to use the path flags
> to allow a GET or SET operation to reference information about an attribute
> or element (a path target) instead of the element itself.
>

Sounds reasonable. So the flag says "this contains metadata about the
target in this path"

> The "type" of the value of such a reference would be a structure based on
> the type of the target element.  The basic structure would have a single
> element representing the permissions, with a scalar representing
> unsupported, read only, write only, and read / write.
> There would be subtypes of this types for defined atomic types.
> Strings would have a length element.
> arrays would have information on the number of entries, first used entry,
> first unused entry, and highest used subscript.  (It is not clear to me
> whether the ability to create / delete array entries is the read-write
> property of the array, or if read-write refers to array entries and we need
> a separate create / delete.)
> The information about where Aliases point would be moved here instead of a
> synthetic structure in the data, simplifying using aliases.
>
> Does this make sense to people?
> Is it a good idea?

Clearly theres need to set things like ACL for an attribute etc.
There are some things which i think you do NOT want people to change:
like the ID - which in the latest draft is now metadata aka
xml-attribute. And i am also not sure it would make any sense for some
things to be even gettable - why would you want to get the ID of an
attribute? (I am almost having second thoughts of whether the ID should
stay as metadata - but thats a different discussion).

Also i am not sure how what you meant by strings etc being transported.

Having said that i think this is a good idea - please post some
examples.

cheers,
jamal


2005
Message-Id: <WED.9.MAR.2005.100351.0500.>
Date: Wed, 9 Mar 2005 10:03:51 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Attribute information
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

At the meeting, I discussed the question of how to represent information
about permissions and capabilities of LFB attributes, structure elements, etc.

Currently, we have LFB capabilities which are defined purely by the LFB
class definition, and may tell you something about which attributes are
supported and what permissions exist for them.  But it is not a general
mechanism.  It does not handle arrays usefully.  It does not handle
structure elements.

So, the suggestion I made (which is derived from discussions with model
team members, but has not been reviewed by them) was to use the path flags
to allow a GET or SET operation to reference information about an attribute
or element (a path target) instead of the element itself.

The "type" of the value of such a reference would be a structure based on
the type of the target element.  The basic structure would have a single
element representing the permissions, with a scalar representing
unsupported, read only, write only, and read / write.
There would be subtypes of this types for defined atomic types.
Strings would have a length element.
arrays would have information on the number of entries, first used entry,
first unused entry, and highest used subscript.  (It is not clear to me
whether the ability to create / delete array entries is the read-write
property of the array, or if read-write refers to array entries and we need
a separate create / delete.)
The information about where Aliases point would be moved here instead of a
synthetic structure in the data, simplifying using aliases.

Does this make sense to people?
Is it a good idea?

Thank you,
Joel


2005
Message-Id: <WED.9.MAR.2005.094700.0500.>
Date: Wed, 9 Mar 2005 09:47:00 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: XML model
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

Thanks for the careful review.
Getting the key declarations right has been "interesting".  I think you are
right about where they go, but I am not sure that has the right
meaning.  The problem may be the selector rather than the placement.  I
have to work with this.  (And probably construct several LFB definitions to
verify against the schema to make sure it means the right thing.)

Yours,
Joel

At 05:36 AM 3/9/2005, Evangelos Haleplidis wrote:
>Greetings again to the list,
>
>I have read the Model draft (-04 version) and used the XML Spy parser to
>have a better view of the XML schema, and found the following typos:
>
>1) Page 64
>type="rangeRestrictionType minOccurs="0"/>
>--------------------------^
>type="rangeRestrictionType" minOccurs="0"/>
>
>2) Page 65
><xsd:element name="keyField" maxOccurs="unbound"
>-----------------------------------------------^
><xsd:element name="keyField" maxOccurs="unbounded"
>
>3) Page 65
><!-declare keys to have unique IDs -->
>--^
><!--declare keys to have unique IDs -->
>
>4) Page 67
><! - does the above ensure that attributes and capabilities
>---^
><!-- does the above ensure that attributes and capabilities
>
>5) Page 67
>Two lines down after typo No4, there seems to be missing a closing comment
>tag: -->
>
>6) Page 65
>The key declarations, for which the comments are as follows, are not
>accepted by the XML parser:
>a) <!-- declare keys to have unique IDs -->
>b) <!-- key declaration to make elementIDs unique in a struct --> In order
>for the XML parser to accept the key declarations, they must be moved
>inside the element declaration. i.e.
>
>a)
><xsd:element name="key" maxOccurs="unbounded">
>         <xsd:complexType>
>                 <xsd:sequence>
>                         <xsd:element name="keyField" type="xsd:string"
> maxOccurs="unbounded"/>
>                 </xsd:sequence>
>                 <xsd:attribute name="keyID" type="xsd:integer"
> use="required"/>
>         </xsd:complexType>
>         <!-- declare keys to have unique IDs -->
>         <xsd:key name="keyID">
>                 <xsd:selector xpath="lfb:key"/>
>                 <xsd:field xpath="@keyID"/>
>         </xsd:key>
></xsd:element>
>
>b)
><xsd:element name="element" maxOccurs="unbounded">
>         <xsd:complexType>
>                 <xsd:sequence>
>                         <xsd:element name="name" type="xsd:NMTOKEN"/>
>                         <xsd:element ref="synopsis"/>
>                         <xsd:element name="optional" minOccurs="0"/>
>                         <xsd:group ref="typeDeclarationGroup"/>
>                 </xsd:sequence>
>                 <xsd:attribute name="elementID" type="xsd:integer"
> use="required"/>
>         </xsd:complexType>
>         <!-- key declaration to make elementIDs unique in a struct -->
>         <xsd:key name="structElementID">
>                 <xsd:selector xpath="lfb:element"/>
>                 <xsd:field xpath="@elementID"/>
>         </xsd:key>
></xsd:element>
>
>Regards,
>Evangelos Haleplidis.


2005
Message-Id: <WED.9.MAR.2005.084454.0800.>
Date: Wed, 9 Mar 2005 08:44:54 -0800
From: "Chawla, Shuchi" <shuchi.chawla@intel.com>
Subject: TCP/IP TML: IETF ForCES WG Update
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01C524C7.53F35C35"

This is a multi-part message in MIME format.

------_=_NextPart_001_01C524C7.53F35C35
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	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Hello all,

I am attaching the presentation on the "TCP/IP based TML for ForCES
Protocol" that was presented at the IETF ForCES WG meeting.  Here are
the main topics that were discussed during the meeting:

- High Availability: A question came up regarding the specification of
control and data channels between the standby CE(s) and an FE to
minimize failover time from the active CE to the standby CE.  In the
model where the standby CE is "passive", the only communication over
this channel might be the heartbeat.  The question was related to why
the draft was specifying this functionality - depending on the hardware,
it may not be possible to set up channels between active and standby CEs
at the same time.  Moreover, CE liveness may be detected using an
inter-CE protocol.  The conclusion was that the TCP/TML draft not
specify anything in this regard, since this is not the TML's decision to
make, and is very dependent on the HA model in place (load balanced CEs
versus redundant standby CEs etc.).

- Multicast Model:  The use of the receiver initiated multicast model
was questioned (this discussion has already been on going in the mailing
list).   With respect to the set up of multicast for ForCES use,
CE-configured multicast was recommended as the preferred model.  Use of
this model would also likely eliminate the need for TML control messages
to join and leave multicast groups as current specified in the draft.
=20
- Data Channel Protocol: Concern was expressed wrt. the use of the PL
Header for all messages on the data channel (this discussion has already
been on going in the mailing list).  The protocol for the data channel
is an area that requires further investigation.=20

- TML Service Interface: It was decided that a Service Interface be
specified for the TML (for use by the PL).  Since this service interface
is common to all TMLs, and would be used by the PL, the suggestion was
made to add it to the PL draft.

The decision was made to accept the TCP/IP TML draft as a Working Group
item.

Regards,
Shuchi


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------_=_NextPart_001_01C524C7.53F35C35--


2005
Message-Id: <SUN.6.MAR.2005.184123.0100.>
Date: Sun, 6 Mar 2005 18:41:23 +0100
From: Patrick Droz <dro@zurich.ibm.com>
Organization: IBM Research
Subject: ForCES Agenda for IETF62
MIME-Version: 1.0
Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms090907060007060805040000"

This is a cryptographically signed message in MIME format.

--------------ms090907060007060805040000
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

attached is the latest version of the agenda.

Regards,
Patrick

Forwarding and Control Element Separation (ForCES)
Agenda, IETF 62, Minneapolis

Monday, March 7, 2005, 9:00-11:30
=================================

CHAIRS:   David Putzolu <David.Putzolu@intel.com>
           Patrick Droz <dro@zurich.ibm.com>

ADs:      Alex Zinin <zinin@psg.com>
           Bill Fenner <fenner@research.att.com>

AGENDA:

10 min - WG status & Agenda Bash - chairs

10 min   ForCES Intra-NE Topology Discovery
          Furquan Ansari
          draft-ansari-forces-discovery-01.txt

15 min - ForCES Forwarding Element Model
          Joel Halpern
          draft-ietf-forces-model-04.txt

30 min - TCP/IP based TML (Transport Mapping Layer) for ForCES protocol
          Shuchi Chawla
          draft-khosravi-forces-tcptml-01.txt

30 min - ForCES Protocol Draft Status & Changes
          Avri Doria or Jamal Salim
          draft-forces-protocol-02.txt


(Updated March 6, 2005)

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--------------ms090907060007060805040000--


2005
Message-Id: <FRI.4.MAR.2005.063838.0500.>
Date: Fri, 4 Mar 2005 06:38:38 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: I-D ACTION:draft-khosravi-forces-tcptml-01.txt
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

The AAL 5 header provides a set of information onthe assumption that the
carried protocol does not provide it easily.

It seems to me reasonable for the TML layer to make use of the PL
structures.  I believe the plan is to support multiple TMLs, with one
PL.  We plan to be able to evolve the PL, but there is no need to support
arbitrary PL formats.
To put this another way, only one of the TML and the PL MUST have the
packet length.  The current proposal for PL has such a length.  So the TML
could dispense with it.
We could reverse that if we wanted to.  But there does not seem to be an
advantage in doing so.

Yours,
Joel

At 01:49 AM 3/4/2005, Alex Audu wrote:
>Hello Patrick,
>
>I took a quick look at GSMP. I am assuming you are refering
>to the Adaptation Method field in the message header. I believe the text
>regarding field indicates that "the
>technology specific conditions are defined in the
>technology specific documentation".  It is not clear to me
>how this goes against what we are trying to do with TML and
>FPL.
>
>Another example we might consider is the Adaptation Layer
>(AAL) in ATM. Is this a better example of what we are trying to do?
>
>Regards,
>Alex.
>
>In a message dated 3/3/2005 4:34:54 AM Eastern Standard Time, Patrick Droz
><dro@zurich.ibm.com> writes:
>
> >Hi Alex,
> >
> >I agree that maybe on some media it is necessary but certainly
> >not on all. Why do we need to do more compared to GSMP?
> >
> >Regards,
> >Patrick
> >
> >Aaudu2000@aol.com wrote:
> >
> >> Hello Patrick,
> >>
> >> The clean layering paradigm we have agreed to adopt splits
> >> the original ForCES protocol into two: the Forces-PL and the
> >> ForCES-TML. The ForCES-TML provides services to the ForCES-PL
> >> layer.  The ForCES-TML is unique by design, to its specific
> >> transport medium. Different transport medium technologies
> >> will demand different TMLs.  Thus a standard interface is
> >> needed between TML and PL modules. The TML will contain the
> >> transport-specific aspects of the protocol while the PL
> >> contains the generic aspects of the ForCES protocol. So, indeed, the
> TML does contain some aspects of the ForCES
> >> protocol, albeit, the transport-specific ones.
> >>
> >> If we don't provide this mechanism, then we are back to the original
> problem we started with,..which is different ForCES protocol for
> different transport media technologies.
> >>
> >> I believe this summarizes the original intent of ForCES WG.
> >>
> >> Regards,
> >> Alex.
> >>
> >> In a message dated 3/2/2005 9:31:53 AM Eastern Standard Time, Patrick
> Droz <dro@zurich.ibm.com> writes:
> >>
> >>
> >>>Hi Alex,
> >>>
> >>>ForCES itself is already a protocol. Why do you need on
> >>>top of it yet another protocol. Having an additional
> >>>ship with just type and length makes parsing of ForCES
> >>>messages easier. GSMP did exactly this. But do we
> >>>additional messages?
> >>>
> >>>Regards,
> >>>Patrick
> >>>
> >>>Alex Audu wrote:
> >>>
> >>>
> >>>>Hi All,
> >>>>
> >>>>What is this talk about doing away with TML headers?  Can
> >>>>someone explain the rational behind this?  How are you going
> >>>>to encode the TML messages meant for a remote peer in an
> >>>>interoperable way if you don't have something like a well
> >>>>defined, agreed upon message header?
> >>>>
> >>>>Regards,
> >>>>Alex.
> >>>>
> >>>>
> >>>>In a message dated 2/28/2005 12:43:55 PM Eastern Standard Time, Jamal
> Hadi Salim <hadi@znyx.com> writes:
> >>>>
> >>>>
> >>>>
> >>>>>Hi Shuchi,
> >>>>>
> >>>>>On Mon, 2005-02-28 at 11:48, Chawla, Shuchi wrote:
> >>>>>
> >>>>>
> >>>>>>Jamal,
> >>>>>>
> >>>>>>Thanks for the feedback on the draft.  Comments below:
> >>>>>>
> >>>>>>TML Header (or lack thereof)
> >>>>>>----------------------------
> >>>>>>I concur that it would simplify the protocol to not require a TML
> >>>>>>header.  However, before we make that decision, I think we would
> want to
> >>>>>>make sure we have covered ground with respect to all of the
> >>>>>>communication that may be required between TML peers.
> >>>>>
> >>>>>A reasonable thing to do
> >>>>>
> >>>>>
> >>>>>
> >>>>>>We had identified
> >>>>>>4 messages so far in this version of the draft:
> >>>>>
> >>>>>I am gonna assume TCP - which is in the context of this draft.
> >>>>>
> >>>>>
> >>>>>
> >>>>>>- 2 multicast support related messages
> >>>>>
> >>>>>I described the scheme in earlier email in response to Furquan - involve
> >>>>>the FE Object and have the multicast be a PL/FE Object
> >>>>>config/subscription issue.
> >>>>>
> >>>>>
> >>>>>
> >>>>>>- 1 heartbeat related message
> >>>>>
> >>>>>use TCP KEEPALIVE;
> >>>>>
> >>>>>
> >>>>>
> >>>>>>- 1 channel closure related message
> >>>>>
> >>>>>EOF is returned when a TCP connection is closed
> >>>>>
> >>>>>
> >>>>>
> >>>>>>Of these, the first three have been addressed in some form in these
> >>>>>>discussions.  As we detail the protocol further, there may be other
> >>>>>>messages that may come up - so we would need to ensure that all of
> these
> >>>>>>messages can either be eliminated or dealt with in some other manner.
> >>>>>>So, I just feel that this needs some more analysis.
> >>>>>>
> >>>>>
> >>>>>Refer to what i said above. We are lucky to have implemented along the
> >>>>>lines of what you propose (refer to the history i gave earlier)- that
> >>>>>helped shape my views.
> >>>>>
> >>>>>
> >>>>>
> >>>>>>Separate Peer TML Control Channel
> >>>>>>---------------------------------
> >>>>>>If we do require peer TML communication, in my opinion the use of a
> >>>>>>separate communication channel for TML messaging is likely to
> complicate
> >>>>>>the situation - in effect, this implies the setup/use of a "control
> >>>>>>channel for a control channel".  I have not thought about all of the
> >>>>>>implications, but here are some areas that the protocol would likely
> >>>>>>need to address:
> >>>>>>- What if one control channel comes up and the other doesn't?
> >>>>>>- Guaranteeing message sequencing between these two control
> channels may
> >>>>>>become more problematic
> >>>>>>- The TML Layer even with this separate channel needs the ability to
> >>>>>>handle two types of messages:
> >>>>>> o Those with a TML layer header received over the TML-TML
> >>>>>>control channel
> >>>>>> o Those without a TML layer header received over the PL-PL
> >>>>>>control channel
> >>>>>
> >>>>>In context of TCP - I would say kill this peer TML relationship. I
> >>>>>probably wouldnt say the same for TIPC.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>>TML Versioning
> >>>>>>--------------
> >>>>>>Not having a TML Layer header would imply that the TML Layer does not
> >>>>>>have a version associated with it.  Is there any other place the TML
> >>>>>>version may be embedded?  If not, it would imply that changes may
> not be
> >>>>>>made to the TML Layer separate from the PL Layer since any change that
> >>>>>>might impact interoperability or modify the layer's behavior would need
> >>>>>>to be reflected in the protocol version.  Since there are multiple TMLs
> >>>>>>that are likely to exist, but a single PL, it would seem prudent that
> >>>>>>TML changes be versioned independent of the PL Layer.  How would
> this be
> >>>>>>achieved?
> >>>>>>
> >>>>>
> >>>>>I see versioning as useful in the case where you have a shim header.
> >>>>>Any other case - the versioning is how code is implemented; and if not
> >>>>>I would say this is a C/FEM config interface issue. If someone wants to
> >>>>>have CEM<->FEM communication they could do that; i would till think of
> >>>>>it mostly as a config of the TML.
> >>>>>
> >>>>>
> >>>>>
> >>>>>>PL Layer knowledge of (Two) Channels
> >>>>>>------------------------------------
> >>>>>>I haven't thought about this deeply, but here are my initial thoughts:
> >>>>>>As long as the TML Layer is only responsible for "transport" and is not
> >>>>>>a decision-maker, I think the PL Layer (or someone other than the TML
> >>>>>>Layer) should have knowledge of the channels being setup.  This will
> >>>>>>especially be required to handle failure cases.  If the TML Layer is
> >>>>>>indeed the only entity aware of this, then it seems that in order to
> >>>>>>deal with failure cases, the TML Layer would need to take charge,
> and in
> >>>>>>that case, there may actually be more messaging required between peer
> >>>>>>TMLs.
> >>>>>>
> >>>>>
> >>>>>My view is that the PL should only worry about Forces Level messaging
> >>>>>i.e treat the TML as a black box; a wire if you may. It just sends
> >>>>>things down and they get to its peers.
> >>>>>The PL may "boot" the TML - but thats about as much control it has over
> >>>>>it.
> >>>>>Remember: in a PL<->TML interface, open() does not necessarily equate to
> >>>>>a TCP socket open() - it doesnt in our case. It just means you are
> >>>>>connected to the TML.
> >>>>>
> >>>>>
> >>>>>
> >>>>>>Also, we haven't addressed HA in detail this draft.  I think some
> of the
> >>>>>>decisions we make will need to take into account HA requirements -
> it is
> >>>>>>hard to architect HA in at a later stage.
> >>>>>
> >>>>>I think we are there - whats missing is the details.
> >>>>>
> >>>>>Two levels of HA:
> >>>>>1) Transport - this is where TML is responsible. Its one layer below the
> >>>>>PL. If a physical link goes down or a socket dies then TML takes
> >>>>>necessary action to recover. If absolutely no possibility of such
> >>>>>recovery (eg when a CE or FE dies) then the PL layer needs to be
> >>>>>involved.
> >>>>>If you remove the relationship of knowledge of how many transport
> >>>>>connections actually exist from the PL level - this becomes more a
> >>>>>TML module worry and becomes specific to the hardware in which the TCP
> >>>>>TML was implemented on.
> >>>>>
> >>>>>2) a FE or CE PL. connection to the peer level is down. This is the
> >>>>>responsibility of the PL. If a CE disappears, then its clear the FE
> >>>>>needs to kick in the HA rules it has and either choose another CE or
> >>>>>hibernate until current one comes back (we discuss a few of these
> >>>>>schemes in the draft - may need some reviewing).
> >>>>>This is clearly a PL module worry.
> >>>>>
> >>>>>cheers,
> >>>>>jamal
> >>>>>
> >>>>
> >>>>
> >>>>
> >>>--
> >>>  Dr. Patrick Droz             | dro@zurich.ibm.com
> >>>  IBM Zurich Research Laboratory   | http://www.zurich.ibm.com/~dro
> >>>  Saumerstrasse 4          | Tel. +41-1-724-85-25 CH-8803
> >>>  Rueschlikon/Switzerland      | Fax. +41-1-724-85-78
> >>>
> >>
> >>
> >>
> >
> >--
> >   Dr. Patrick Droz             | dro@zurich.ibm.com
> >   IBM Zurich Research Laboratory   | http://www.zurich.ibm.com/~dro
> >   Saumerstrasse 4          | Tel. +41-1-724-85-25 CH-8803
> >   Rueschlikon/Switzerland      | Fax. +41-1-724-85-78
> >


2005
Message-Id: <FRI.4.MAR.2005.014915.0500.>
Date: Fri, 4 Mar 2005 01:49:15 -0500
From: Alex Audu <Aaudu2000@aol.com>
Subject: Re: I-D ACTION:draft-khosravi-forces-tcptml-01.txt
Comments: To: Patrick Droz <dro@zurich.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit

Hello Patrick,

I took a quick look at GSMP. I am assuming you are refering
to the Adaptation Method field in the message header. I believe the text regarding field indicates that "the
technology specific conditions are defined in the
technology specific documentation".  It is not clear to me
how this goes against what we are trying to do with TML and
FPL.

Another example we might consider is the Adaptation Layer
(AAL) in ATM. Is this a better example of what we are trying to do?

Regards,
Alex.

In a message dated 3/3/2005 4:34:54 AM Eastern Standard Time, Patrick Droz <dro@zurich.ibm.com> writes:

>Hi Alex,
>
>I agree that maybe on some media it is necessary but certainly
>not on all. Why do we need to do more compared to GSMP?
>
>Regards,
>Patrick
>
>Aaudu2000@aol.com wrote:
>
>> Hello Patrick,
>>
>> The clean layering paradigm we have agreed to adopt splits
>> the original ForCES protocol into two: the Forces-PL and the
>> ForCES-TML. The ForCES-TML provides services to the ForCES-PL
>> layer.  The ForCES-TML is unique by design, to its specific
>> transport medium. Different transport medium technologies
>> will demand different TMLs.  Thus a standard interface is
>> needed between TML and PL modules. The TML will contain the
>> transport-specific aspects of the protocol while the PL
>> contains the generic aspects of the ForCES protocol. So, indeed, the TML does contain some aspects of the ForCES
>> protocol, albeit, the transport-specific ones.
>>
>> If we don't provide this mechanism, then we are back to the original problem we started with,..which is different ForCES protocol for different transport media technologies.  
>>
>> I believe this summarizes the original intent of ForCES WG.
>>
>> Regards,
>> Alex.
>>
>> In a message dated 3/2/2005 9:31:53 AM Eastern Standard Time, Patrick Droz <dro@zurich.ibm.com> writes:
>>
>>
>>>Hi Alex,
>>>
>>>ForCES itself is already a protocol. Why do you need on
>>>top of it yet another protocol. Having an additional
>>>ship with just type and length makes parsing of ForCES
>>>messages easier. GSMP did exactly this. But do we
>>>additional messages?
>>>
>>>Regards,
>>>Patrick
>>>
>>>Alex Audu wrote:
>>>
>>>
>>>>Hi All,
>>>>
>>>>What is this talk about doing away with TML headers?  Can
>>>>someone explain the rational behind this?  How are you going
>>>>to encode the TML messages meant for a remote peer in an
>>>>interoperable way if you don't have something like a well
>>>>defined, agreed upon message header?
>>>>
>>>>Regards,
>>>>Alex.
>>>>
>>>>
>>>>In a message dated 2/28/2005 12:43:55 PM Eastern Standard Time, Jamal Hadi Salim <hadi@znyx.com> writes:
>>>>
>>>>
>>>>
>>>>>Hi Shuchi,
>>>>>
>>>>>On Mon, 2005-02-28 at 11:48, Chawla, Shuchi wrote:
>>>>>
>>>>>
>>>>>>Jamal,
>>>>>>
>>>>>>Thanks for the feedback on the draft.  Comments below:
>>>>>>
>>>>>>TML Header (or lack thereof)
>>>>>>----------------------------
>>>>>>I concur that it would simplify the protocol to not require a TML
>>>>>>header.  However, before we make that decision, I think we would want to
>>>>>>make sure we have covered ground with respect to all of the
>>>>>>communication that may be required between TML peers.
>>>>>
>>>>>A reasonable thing to do
>>>>>
>>>>>
>>>>>
>>>>>>We had identified
>>>>>>4 messages so far in this version of the draft:
>>>>>
>>>>>I am gonna assume TCP - which is in the context of this draft.
>>>>>
>>>>>
>>>>>
>>>>>>- 2 multicast support related messages
>>>>>
>>>>>I described the scheme in earlier email in response to Furquan - involve
>>>>>the FE Object and have the multicast be a PL/FE Object
>>>>>config/subscription issue.
>>>>>
>>>>>
>>>>>
>>>>>>- 1 heartbeat related message
>>>>>
>>>>>use TCP KEEPALIVE;
>>>>>
>>>>>
>>>>>
>>>>>>- 1 channel closure related message
>>>>>
>>>>>EOF is returned when a TCP connection is closed
>>>>>
>>>>>
>>>>>
>>>>>>Of these, the first three have been addressed in some form in these
>>>>>>discussions.  As we detail the protocol further, there may be other
>>>>>>messages that may come up - so we would need to ensure that all of these
>>>>>>messages can either be eliminated or dealt with in some other manner.
>>>>>>So, I just feel that this needs some more analysis.
>>>>>>
>>>>>
>>>>>Refer to what i said above. We are lucky to have implemented along the
>>>>>lines of what you propose (refer to the history i gave earlier)- that
>>>>>helped shape my views.
>>>>>
>>>>>
>>>>>
>>>>>>Separate Peer TML Control Channel
>>>>>>---------------------------------
>>>>>>If we do require peer TML communication, in my opinion the use of a
>>>>>>separate communication channel for TML messaging is likely to complicate
>>>>>>the situation - in effect, this implies the setup/use of a "control
>>>>>>channel for a control channel".  I have not thought about all of the
>>>>>>implications, but here are some areas that the protocol would likely
>>>>>>need to address:
>>>>>>- What if one control channel comes up and the other doesn't?
>>>>>>- Guaranteeing message sequencing between these two control channels may
>>>>>>become more problematic
>>>>>>- The TML Layer even with this separate channel needs the ability to
>>>>>>handle two types of messages:
>>>>>> o Those with a TML layer header received over the TML-TML
>>>>>>control channel
>>>>>> o Those without a TML layer header received over the PL-PL
>>>>>>control channel
>>>>>
>>>>>In context of TCP - I would say kill this peer TML relationship. I
>>>>>probably wouldnt say the same for TIPC.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>TML Versioning
>>>>>>--------------
>>>>>>Not having a TML Layer header would imply that the TML Layer does not
>>>>>>have a version associated with it.  Is there any other place the TML
>>>>>>version may be embedded?  If not, it would imply that changes may not be
>>>>>>made to the TML Layer separate from the PL Layer since any change that
>>>>>>might impact interoperability or modify the layer's behavior would need
>>>>>>to be reflected in the protocol version.  Since there are multiple TMLs
>>>>>>that are likely to exist, but a single PL, it would seem prudent that
>>>>>>TML changes be versioned independent of the PL Layer.  How would this be
>>>>>>achieved?
>>>>>>
>>>>>
>>>>>I see versioning as useful in the case where you have a shim header.
>>>>>Any other case - the versioning is how code is implemented; and if not
>>>>>I would say this is a C/FEM config interface issue. If someone wants to
>>>>>have CEM<->FEM communication they could do that; i would till think of
>>>>>it mostly as a config of the TML.
>>>>>
>>>>>
>>>>>
>>>>>>PL Layer knowledge of (Two) Channels
>>>>>>------------------------------------
>>>>>>I haven't thought about this deeply, but here are my initial thoughts:
>>>>>>As long as the TML Layer is only responsible for "transport" and is not
>>>>>>a decision-maker, I think the PL Layer (or someone other than the TML
>>>>>>Layer) should have knowledge of the channels being setup.  This will
>>>>>>especially be required to handle failure cases.  If the TML Layer is
>>>>>>indeed the only entity aware of this, then it seems that in order to
>>>>>>deal with failure cases, the TML Layer would need to take charge, and in
>>>>>>that case, there may actually be more messaging required between peer
>>>>>>TMLs.
>>>>>>
>>>>>
>>>>>My view is that the PL should only worry about Forces Level messaging
>>>>>i.e treat the TML as a black box; a wire if you may. It just sends
>>>>>things down and they get to its peers.
>>>>>The PL may "boot" the TML - but thats about as much control it has over
>>>>>it.
>>>>>Remember: in a PL<->TML interface, open() does not necessarily equate to
>>>>>a TCP socket open() - it doesnt in our case. It just means you are
>>>>>connected to the TML.
>>>>>
>>>>>
>>>>>
>>>>>>Also, we haven't addressed HA in detail this draft.  I think some of the
>>>>>>decisions we make will need to take into account HA requirements - it is
>>>>>>hard to architect HA in at a later stage.
>>>>>
>>>>>I think we are there - whats missing is the details.
>>>>>
>>>>>Two levels of HA:
>>>>>1) Transport - this is where TML is responsible. Its one layer below the
>>>>>PL. If a physical link goes down or a socket dies then TML takes
>>>>>necessary action to recover. If absolutely no possibility of such
>>>>>recovery (eg when a CE or FE dies) then the PL layer needs to be
>>>>>involved.
>>>>>If you remove the relationship of knowledge of how many transport
>>>>>connections actually exist from the PL level - this becomes more a
>>>>>TML module worry and becomes specific to the hardware in which the TCP
>>>>>TML was implemented on.
>>>>>
>>>>>2) a FE or CE PL. connection to the peer level is down. This is the
>>>>>responsibility of the PL. If a CE disappears, then its clear the FE
>>>>>needs to kick in the HA rules it has and either choose another CE or
>>>>>hibernate until current one comes back (we discuss a few of these
>>>>>schemes in the draft - may need some reviewing).
>>>>>This is clearly a PL module worry.
>>>>>
>>>>>cheers,
>>>>>jamal
>>>>>
>>>>
>>>>
>>>>
>>>--
>>>  Dr. Patrick Droz             | dro@zurich.ibm.com
>>>  IBM Zurich Research Laboratory   | http://www.zurich.ibm.com/~dro
>>>  Saumerstrasse 4          | Tel. +41-1-724-85-25 CH-8803
>>>  Rueschlikon/Switzerland      | Fax. +41-1-724-85-78
>>>
>>
>>
>>
>
>--
>   Dr. Patrick Droz             | dro@zurich.ibm.com
>   IBM Zurich Research Laboratory   | http://www.zurich.ibm.com/~dro
>   Saumerstrasse 4          | Tel. +41-1-724-85-25 CH-8803
>   Rueschlikon/Switzerland      | Fax. +41-1-724-85-78
>


2005
Message-Id: <THU.3.MAR.2005.104455.0100.>
Date: Thu, 3 Mar 2005 10:44:55 +0100
From: Patrick Droz <dro@zurich.ibm.com>
Organization: IBM Research
Subject: [Fwd: Re: [FORCES] I-D ACTION:draft-khosravi-forces-tcptml-01.txt]
MIME-Version: 1.0
Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms020700030503000904050000"

This is a cryptographically signed message in MIME format.

--------------ms020700030503000904050000
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

sorry I did not do a replay all.

Regards,
Patrick

-------- Original Message --------
Subject: Re: [FORCES] I-D ACTION:draft-khosravi-forces-tcptml-01.txt
Date: Thu, 03 Mar 2005 10:32:51 +0100
From: Patrick Droz <dro@zurich.ibm.com>
Organization: IBM Research
To: Khosravi, Hormuzd M <hormuzd.m.khosravi@intel.com>
References: <468F3FDA28AA87429AD807992E22D07E046D56CA@orsmsx408>

Hi Hormuzd,

see comment inline.

Khosravi, Hormuzd M wrote:

> Robert,
>
> Thanks for your feedback! Pls see my comments inline below...
>
> -----Original Message-----
> From: Forwarding and Control Element Separation
> [mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Robert Haas
>
> I think we also have to provide a way to transport redirected packets
> from the FE to the CE _without_ any encapsulation, i.e. _raw_
> redirection.
>
> The bad-length case raised by Joel could be supported with
> encapsulation, as it anyway remains a corner case. And I don't think it
> is difficult to distinguish such raw redirected packets from PL
> messages, nor to prevent DoS by setting shapers in the FE. My main
> motivation is to free the FEs from an unnecessary encapsulation load.
>
> [HK] The biggest issue that I see for not encapsulating the redirected
> packets in the PL header is interoperability. This is clearly a
> tradeoff, you might get slightly better performance if you avoid any
> encapsulation (although we haven't noticed any performance issues here)
> but at the cost of Interoperability, bad-length case that Joel pointed
> out, loss of protocol-inbuilt DoS prevention mechanisms, etc. IMHO,
> Interoperability alone clearly out weighs any performance benefits here
> (not considering the other issues, which are also significant).
>

performance is an issue here. OSPF for example does not use TCP but
rather raw socket. Why do you want to have each OSPF message go
through ForCES. This need additional copies and parsing. How would
we support an RDMA capable interface? Most things that are intended
for the CE do not need to be encapsulated in ForCES. I also do not
understand why this raises interpretability problems. Today without
ForCES OSPF as an example works fine and we do not have interpretability
problems. Just send the packets for the CE which are not ForCES
related in the traditional why to the CE.

> BTW, if you have any performance nos here, pls do share them with us. I
> would be very interested to know since we didn't see any such issues in
> our implementation.
>

look at the work that RDMA and OpenRDMA is doing. The goal is to have
a zero copy stack to reduce latency. By coping the packed again we
introduce additional overhead in kernel space and user space since we
have to copy and parse the packet again.

Regards,
Patrick

>
>>BTW, Jamal, I agree very much with your design philosophy regarding
>>doing away with TML messages/ header and keeping it simple. Just need
>
> to
>
>>analyze further if this is viable.
>
>
> That has been my thinking as well. As Jamal described, some additions to
>
> the FE LFB can replace special mcast control TML messages.
>
> [HK] Good, we are all on the same page here...we will definitely strive
> to achieve this goal of minimal TML overhead...it should be achievable.
>
> Regards
> Hormuzd
>
>

--
    Dr. Patrick Droz 			| dro@zurich.ibm.com
    IBM Zurich Research Laboratory 	| http://www.zurich.ibm.com/~dro
    Saumerstrasse 4 			| Tel. +41-1-724-85-25 CH-8803
    Rueschlikon/Switzerland 		| Fax. +41-1-724-85-78


--
   Dr. Patrick Droz 			| dro@zurich.ibm.com
   IBM Zurich Research Laboratory 	| http://www.zurich.ibm.com/~dro
   Saumerstrasse 4 			| Tel. +41-1-724-85-25 CH-8803
   Rueschlikon/Switzerland 		| Fax. +41-1-724-85-78

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--------------ms020700030503000904050000--


2005
Message-Id: <THU.3.MAR.2005.103454.0100.>
Date: Thu, 3 Mar 2005 10:34:54 +0100
From: Patrick Droz <dro@zurich.ibm.com>
Organization: IBM Research
Subject: Re: I-D ACTION:draft-khosravi-forces-tcptml-01.txt
Comments: To: Aaudu2000@aol.com
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Hi Alex,

I agree that maybe on some media it is necessary but certainly
not on all. Why do we need to do more compared to GSMP?

Regards,
Patrick

Aaudu2000@aol.com wrote:

> Hello Patrick,
>
> The clean layering paradigm we have agreed to adopt splits
> the original ForCES protocol into two: the Forces-PL and the
> ForCES-TML. The ForCES-TML provides services to the ForCES-PL
> layer.  The ForCES-TML is unique by design, to its specific
> transport medium. Different transport medium technologies
> will demand different TMLs.  Thus a standard interface is
> needed between TML and PL modules. The TML will contain the
> transport-specific aspects of the protocol while the PL
> contains the generic aspects of the ForCES protocol. So, indeed, the TML does contain some aspects of the ForCES
> protocol, albeit, the transport-specific ones.
>
> If we don't provide this mechanism, then we are back to the original problem we started with,..which is different ForCES protocol for different transport media technologies.
>
> I believe this summarizes the original intent of ForCES WG.
>
> Regards,
> Alex.
>
> In a message dated 3/2/2005 9:31:53 AM Eastern Standard Time, Patrick Droz <dro@zurich.ibm.com> writes:
>
>
>>Hi Alex,
>>
>>ForCES itself is already a protocol. Why do you need on
>>top of it yet another protocol. Having an additional
>>ship with just type and length makes parsing of ForCES
>>messages easier. GSMP did exactly this. But do we
>>additional messages?
>>
>>Regards,
>>Patrick
>>
>>Alex Audu wrote:
>>
>>
>>>Hi All,
>>>
>>>What is this talk about doing away with TML headers?  Can
>>>someone explain the rational behind this?  How are you going
>>>to encode the TML messages meant for a remote peer in an
>>>interoperable way if you don't have something like a well
>>>defined, agreed upon message header?
>>>
>>>Regards,
>>>Alex.
>>>
>>>
>>>In a message dated 2/28/2005 12:43:55 PM Eastern Standard Time, Jamal Hadi Salim <hadi@znyx.com> writes:
>>>
>>>
>>>
>>>>Hi Shuchi,
>>>>
>>>>On Mon, 2005-02-28 at 11:48, Chawla, Shuchi wrote:
>>>>
>>>>
>>>>>Jamal,
>>>>>
>>>>>Thanks for the feedback on the draft.  Comments below:
>>>>>
>>>>>TML Header (or lack thereof)
>>>>>----------------------------
>>>>>I concur that it would simplify the protocol to not require a TML
>>>>>header.  However, before we make that decision, I think we would want to
>>>>>make sure we have covered ground with respect to all of the
>>>>>communication that may be required between TML peers.
>>>>
>>>>A reasonable thing to do
>>>>
>>>>
>>>>
>>>>>We had identified
>>>>>4 messages so far in this version of the draft:
>>>>
>>>>I am gonna assume TCP - which is in the context of this draft.
>>>>
>>>>
>>>>
>>>>>- 2 multicast support related messages
>>>>
>>>>I described the scheme in earlier email in response to Furquan - involve
>>>>the FE Object and have the multicast be a PL/FE Object
>>>>config/subscription issue.
>>>>
>>>>
>>>>
>>>>>- 1 heartbeat related message
>>>>
>>>>use TCP KEEPALIVE;
>>>>
>>>>
>>>>
>>>>>- 1 channel closure related message
>>>>
>>>>EOF is returned when a TCP connection is closed
>>>>
>>>>
>>>>
>>>>>Of these, the first three have been addressed in some form in these
>>>>>discussions.  As we detail the protocol further, there may be other
>>>>>messages that may come up - so we would need to ensure that all of these
>>>>>messages can either be eliminated or dealt with in some other manner.
>>>>>So, I just feel that this needs some more analysis.
>>>>>
>>>>
>>>>Refer to what i said above. We are lucky to have implemented along the
>>>>lines of what you propose (refer to the history i gave earlier)- that
>>>>helped shape my views.
>>>>
>>>>
>>>>
>>>>>Separate Peer TML Control Channel
>>>>>---------------------------------
>>>>>If we do require peer TML communication, in my opinion the use of a
>>>>>separate communication channel for TML messaging is likely to complicate
>>>>>the situation - in effect, this implies the setup/use of a "control
>>>>>channel for a control channel".  I have not thought about all of the
>>>>>implications, but here are some areas that the protocol would likely
>>>>>need to address:
>>>>>- What if one control channel comes up and the other doesn't?
>>>>>- Guaranteeing message sequencing between these two control channels may
>>>>>become more problematic
>>>>>- The TML Layer even with this separate channel needs the ability to
>>>>>handle two types of messages:
>>>>> o Those with a TML layer header received over the TML-TML
>>>>>control channel
>>>>> o Those without a TML layer header received over the PL-PL
>>>>>control channel
>>>>
>>>>In context of TCP - I would say kill this peer TML relationship. I
>>>>probably wouldnt say the same for TIPC.
>>>>
>>>>
>>>>
>>>>
>>>>>TML Versioning
>>>>>--------------
>>>>>Not having a TML Layer header would imply that the TML Layer does not
>>>>>have a version associated with it.  Is there any other place the TML
>>>>>version may be embedded?  If not, it would imply that changes may not be
>>>>>made to the TML Layer separate from the PL Layer since any change that
>>>>>might impact interoperability or modify the layer's behavior would need
>>>>>to be reflected in the protocol version.  Since there are multiple TMLs
>>>>>that are likely to exist, but a single PL, it would seem prudent that
>>>>>TML changes be versioned independent of the PL Layer.  How would this be
>>>>>achieved?
>>>>>
>>>>
>>>>I see versioning as useful in the case where you have a shim header.
>>>>Any other case - the versioning is how code is implemented; and if not
>>>>I would say this is a C/FEM config interface issue. If someone wants to
>>>>have CEM<->FEM communication they could do that; i would till think of
>>>>it mostly as a config of the TML.
>>>>
>>>>
>>>>
>>>>>PL Layer knowledge of (Two) Channels
>>>>>------------------------------------
>>>>>I haven't thought about this deeply, but here are my initial thoughts:
>>>>>As long as the TML Layer is only responsible for "transport" and is not
>>>>>a decision-maker, I think the PL Layer (or someone other than the TML
>>>>>Layer) should have knowledge of the channels being setup.  This will
>>>>>especially be required to handle failure cases.  If the TML Layer is
>>>>>indeed the only entity aware of this, then it seems that in order to
>>>>>deal with failure cases, the TML Layer would need to take charge, and in
>>>>>that case, there may actually be more messaging required between peer
>>>>>TMLs.
>>>>>
>>>>
>>>>My view is that the PL should only worry about Forces Level messaging
>>>>i.e treat the TML as a black box; a wire if you may. It just sends
>>>>things down and they get to its peers.
>>>>The PL may "boot" the TML - but thats about as much control it has over
>>>>it.
>>>>Remember: in a PL<->TML interface, open() does not necessarily equate to
>>>>a TCP socket open() - it doesnt in our case. It just means you are
>>>>connected to the TML.
>>>>
>>>>
>>>>
>>>>>Also, we haven't addressed HA in detail this draft.  I think some of the
>>>>>decisions we make will need to take into account HA requirements - it is
>>>>>hard to architect HA in at a later stage.
>>>>
>>>>I think we are there - whats missing is the details.
>>>>
>>>>Two levels of HA:
>>>>1) Transport - this is where TML is responsible. Its one layer below the
>>>>PL. If a physical link goes down or a socket dies then TML takes
>>>>necessary action to recover. If absolutely no possibility of such
>>>>recovery (eg when a CE or FE dies) then the PL layer needs to be
>>>>involved.
>>>>If you remove the relationship of knowledge of how many transport
>>>>connections actually exist from the PL level - this becomes more a
>>>>TML module worry and becomes specific to the hardware in which the TCP
>>>>TML was implemented on.
>>>>
>>>>2) a FE or CE PL. connection to the peer level is down. This is the
>>>>responsibility of the PL. If a CE disappears, then its clear the FE
>>>>needs to kick in the HA rules it has and either choose another CE or
>>>>hibernate until current one comes back (we discuss a few of these
>>>>schemes in the draft - may need some reviewing).
>>>>This is clearly a PL module worry.
>>>>
>>>>cheers,
>>>>jamal
>>>>
>>>
>>>
>>>
>>--
>>  Dr. Patrick Droz             | dro@zurich.ibm.com
>>  IBM Zurich Research Laboratory   | http://www.zurich.ibm.com/~dro
>>  Saumerstrasse 4          | Tel. +41-1-724-85-25 CH-8803
>>  Rueschlikon/Switzerland      | Fax. +41-1-724-85-78
>>
>
>
>

--
   Dr. Patrick Droz 			| dro@zurich.ibm.com
   IBM Zurich Research Laboratory 	| http://www.zurich.ibm.com/~dro
   Saumerstrasse 4 			| Tel. +41-1-724-85-25 CH-8803
   Rueschlikon/Switzerland 		| Fax. +41-1-724-85-78

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2005
Message-Id: <WED.2.MAR.2005.202048.0500.>
Date: Wed, 2 Mar 2005 20:20:48 -0500
From: Alex Audu <Aaudu2000@aol.com>
Subject: Re: I-D ACTION:draft-khosravi-forces-tcptml-01.txt
Comments: To: Patrick Droz <dro@zurich.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit

Hello Patrick,

The clean layering paradigm we have agreed to adopt splits
the original ForCES protocol into two: the Forces-PL and the
ForCES-TML. The ForCES-TML provides services to the ForCES-PL
layer.  The ForCES-TML is unique by design, to its specific
transport medium. Different transport medium technologies
will demand different TMLs.  Thus a standard interface is
needed between TML and PL modules. The TML will contain the
transport-specific aspects of the protocol while the PL
contains the generic aspects of the ForCES protocol. So, indeed, the TML does contain some aspects of the ForCES
protocol, albeit, the transport-specific ones.

If we don't provide this mechanism, then we are back to the original problem we started with,..which is different ForCES protocol for different transport media technologies.

I believe this summarizes the original intent of ForCES WG.

Regards,
Alex.

In a message dated 3/2/2005 9:31:53 AM Eastern Standard Time, Patrick Droz <dro@zurich.ibm.com> writes:

>Hi Alex,
>
>ForCES itself is already a protocol. Why do you need on
>top of it yet another protocol. Having an additional
>ship with just type and length makes parsing of ForCES
>messages easier. GSMP did exactly this. But do we
>additional messages?
>
>Regards,
>Patrick
>
>Alex Audu wrote:
>
>> Hi All,
>>
>> What is this talk about doing away with TML headers?  Can
>> someone explain the rational behind this?  How are you going
>> to encode the TML messages meant for a remote peer in an
>> interoperable way if you don't have something like a well
>> defined, agreed upon message header?
>>
>> Regards,
>> Alex.
>>
>>
>> In a message dated 2/28/2005 12:43:55 PM Eastern Standard Time, Jamal Hadi Salim <hadi@znyx.com> writes:
>>
>>
>>>Hi Shuchi,
>>>
>>>On Mon, 2005-02-28 at 11:48, Chawla, Shuchi wrote:
>>>
>>>>Jamal,
>>>>
>>>>Thanks for the feedback on the draft.  Comments below:
>>>>
>>>>TML Header (or lack thereof)
>>>>----------------------------
>>>>I concur that it would simplify the protocol to not require a TML
>>>>header.  However, before we make that decision, I think we would want to
>>>>make sure we have covered ground with respect to all of the
>>>>communication that may be required between TML peers.
>>>
>>>A reasonable thing to do
>>>
>>>
>>>> We had identified
>>>>4 messages so far in this version of the draft:
>>>
>>>I am gonna assume TCP - which is in the context of this draft.
>>>
>>>
>>>>- 2 multicast support related messages
>>>
>>>I described the scheme in earlier email in response to Furquan - involve
>>>the FE Object and have the multicast be a PL/FE Object
>>>config/subscription issue.
>>>
>>>
>>>>- 1 heartbeat related message
>>>
>>>use TCP KEEPALIVE;
>>>
>>>
>>>>- 1 channel closure related message
>>>
>>>EOF is returned when a TCP connection is closed
>>>
>>>
>>>>Of these, the first three have been addressed in some form in these
>>>>discussions.  As we detail the protocol further, there may be other
>>>>messages that may come up - so we would need to ensure that all of these
>>>>messages can either be eliminated or dealt with in some other manner.
>>>>So, I just feel that this needs some more analysis.
>>>>
>>>
>>>Refer to what i said above. We are lucky to have implemented along the
>>>lines of what you propose (refer to the history i gave earlier)- that
>>>helped shape my views.
>>>
>>>
>>>>Separate Peer TML Control Channel
>>>>---------------------------------
>>>>If we do require peer TML communication, in my opinion the use of a
>>>>separate communication channel for TML messaging is likely to complicate
>>>>the situation - in effect, this implies the setup/use of a "control
>>>>channel for a control channel".  I have not thought about all of the
>>>>implications, but here are some areas that the protocol would likely
>>>>need to address:
>>>>- What if one control channel comes up and the other doesn't?
>>>>- Guaranteeing message sequencing between these two control channels may
>>>>become more problematic
>>>>- The TML Layer even with this separate channel needs the ability to
>>>>handle two types of messages:
>>>>  o Those with a TML layer header received over the TML-TML
>>>>control channel
>>>>  o Those without a TML layer header received over the PL-PL
>>>>control channel
>>>
>>>In context of TCP - I would say kill this peer TML relationship. I
>>>probably wouldnt say the same for TIPC.
>>>
>>>
>>>
>>>>TML Versioning
>>>>--------------
>>>>Not having a TML Layer header would imply that the TML Layer does not
>>>>have a version associated with it.  Is there any other place the TML
>>>>version may be embedded?  If not, it would imply that changes may not be
>>>>made to the TML Layer separate from the PL Layer since any change that
>>>>might impact interoperability or modify the layer's behavior would need
>>>>to be reflected in the protocol version.  Since there are multiple TMLs
>>>>that are likely to exist, but a single PL, it would seem prudent that
>>>>TML changes be versioned independent of the PL Layer.  How would this be
>>>>achieved?
>>>>
>>>
>>>I see versioning as useful in the case where you have a shim header.
>>>Any other case - the versioning is how code is implemented; and if not
>>>I would say this is a C/FEM config interface issue. If someone wants to
>>>have CEM<->FEM communication they could do that; i would till think of
>>>it mostly as a config of the TML.
>>>
>>>
>>>>PL Layer knowledge of (Two) Channels
>>>>------------------------------------
>>>>I haven't thought about this deeply, but here are my initial thoughts:
>>>>As long as the TML Layer is only responsible for "transport" and is not
>>>>a decision-maker, I think the PL Layer (or someone other than the TML
>>>>Layer) should have knowledge of the channels being setup.  This will
>>>>especially be required to handle failure cases.  If the TML Layer is
>>>>indeed the only entity aware of this, then it seems that in order to
>>>>deal with failure cases, the TML Layer would need to take charge, and in
>>>>that case, there may actually be more messaging required between peer
>>>>TMLs.
>>>>
>>>
>>>My view is that the PL should only worry about Forces Level messaging
>>>i.e treat the TML as a black box; a wire if you may. It just sends
>>>things down and they get to its peers.
>>>The PL may "boot" the TML - but thats about as much control it has over
>>>it.
>>>Remember: in a PL<->TML interface, open() does not necessarily equate to
>>>a TCP socket open() - it doesnt in our case. It just means you are
>>>connected to the TML.
>>>
>>>
>>>>Also, we haven't addressed HA in detail this draft.  I think some of the
>>>>decisions we make will need to take into account HA requirements - it is
>>>>hard to architect HA in at a later stage.
>>>
>>>I think we are there - whats missing is the details.
>>>
>>>Two levels of HA:
>>>1) Transport - this is where TML is responsible. Its one layer below the
>>>PL. If a physical link goes down or a socket dies then TML takes
>>>necessary action to recover. If absolutely no possibility of such
>>>recovery (eg when a CE or FE dies) then the PL layer needs to be
>>>involved.
>>>If you remove the relationship of knowledge of how many transport
>>>connections actually exist from the PL level - this becomes more a
>>>TML module worry and becomes specific to the hardware in which the TCP
>>>TML was implemented on.
>>>
>>>2) a FE or CE PL. connection to the peer level is down. This is the
>>>responsibility of the PL. If a CE disappears, then its clear the FE
>>>needs to kick in the HA rules it has and either choose another CE or
>>>hibernate until current one comes back (we discuss a few of these
>>>schemes in the draft - may need some reviewing).
>>>This is clearly a PL module worry.
>>>
>>>cheers,
>>>jamal
>>>
>>
>>
>>
>
>--
>   Dr. Patrick Droz             | dro@zurich.ibm.com
>   IBM Zurich Research Laboratory   | http://www.zurich.ibm.com/~dro
>   Saumerstrasse 4          | Tel. +41-1-724-85-25 CH-8803
>   Rueschlikon/Switzerland      | Fax. +41-1-724-85-78
>


2005
Message-Id: <WED.2.MAR.2005.153153.0100.>
Date: Wed, 2 Mar 2005 15:31:53 +0100
From: Patrick Droz <dro@zurich.ibm.com>
Organization: IBM Research
Subject: Re: I-D ACTION:draft-khosravi-forces-tcptml-01.txt
MIME-Version: 1.0
Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms040806040000070108050203"

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--------------ms040806040000070108050203
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Hi Alex,

ForCES itself is already a protocol. Why do you need on
top of it yet another protocol. Having an additional
ship with just type and length makes parsing of ForCES
messages easier. GSMP did exactly this. But do we
additional messages?

Regards,
Patrick

Alex Audu wrote:

> Hi All,
>
> What is this talk about doing away with TML headers?  Can
> someone explain the rational behind this?  How are you going
> to encode the TML messages meant for a remote peer in an
> interoperable way if you don't have something like a well
> defined, agreed upon message header?
>
> Regards,
> Alex.
>
>
> In a message dated 2/28/2005 12:43:55 PM Eastern Standard Time, Jamal Hadi Salim <hadi@znyx.com> writes:
>
>
>>Hi Shuchi,
>>
>>On Mon, 2005-02-28 at 11:48, Chawla, Shuchi wrote:
>>
>>>Jamal,
>>>
>>>Thanks for the feedback on the draft.  Comments below:
>>>
>>>TML Header (or lack thereof)
>>>----------------------------
>>>I concur that it would simplify the protocol to not require a TML
>>>header.  However, before we make that decision, I think we would want to
>>>make sure we have covered ground with respect to all of the
>>>communication that may be required between TML peers.
>>
>>A reasonable thing to do
>>
>>
>>> We had identified
>>>4 messages so far in this version of the draft:
>>
>>I am gonna assume TCP - which is in the context of this draft.
>>
>>
>>>- 2 multicast support related messages
>>
>>I described the scheme in earlier email in response to Furquan - involve
>>the FE Object and have the multicast be a PL/FE Object
>>config/subscription issue.
>>
>>
>>>- 1 heartbeat related message
>>
>>use TCP KEEPALIVE;
>>
>>
>>>- 1 channel closure related message
>>
>>EOF is returned when a TCP connection is closed
>>
>>
>>>Of these, the first three have been addressed in some form in these
>>>discussions.  As we detail the protocol further, there may be other
>>>messages that may come up - so we would need to ensure that all of these
>>>messages can either be eliminated or dealt with in some other manner.
>>>So, I just feel that this needs some more analysis.
>>>
>>
>>Refer to what i said above. We are lucky to have implemented along the
>>lines of what you propose (refer to the history i gave earlier)- that
>>helped shape my views.
>>
>>
>>>Separate Peer TML Control Channel
>>>---------------------------------
>>>If we do require peer TML communication, in my opinion the use of a
>>>separate communication channel for TML messaging is likely to complicate
>>>the situation - in effect, this implies the setup/use of a "control
>>>channel for a control channel".  I have not thought about all of the
>>>implications, but here are some areas that the protocol would likely
>>>need to address:
>>>- What if one control channel comes up and the other doesn't?
>>>- Guaranteeing message sequencing between these two control channels may
>>>become more problematic
>>>- The TML Layer even with this separate channel needs the ability to
>>>handle two types of messages:
>>>  o Those with a TML layer header received over the TML-TML
>>>control channel
>>>  o Those without a TML layer header received over the PL-PL
>>>control channel
>>
>>In context of TCP - I would say kill this peer TML relationship. I
>>probably wouldnt say the same for TIPC.
>>
>>
>>
>>>TML Versioning
>>>--------------
>>>Not having a TML Layer header would imply that the TML Layer does not
>>>have a version associated with it.  Is there any other place the TML
>>>version may be embedded?  If not, it would imply that changes may not be
>>>made to the TML Layer separate from the PL Layer since any change that
>>>might impact interoperability or modify the layer's behavior would need
>>>to be reflected in the protocol version.  Since there are multiple TMLs
>>>that are likely to exist, but a single PL, it would seem prudent that
>>>TML changes be versioned independent of the PL Layer.  How would this be
>>>achieved?
>>>
>>
>>I see versioning as useful in the case where you have a shim header.
>>Any other case - the versioning is how code is implemented; and if not
>>I would say this is a C/FEM config interface issue. If someone wants to
>>have CEM<->FEM communication they could do that; i would till think of
>>it mostly as a config of the TML.
>>
>>
>>>PL Layer knowledge of (Two) Channels
>>>------------------------------------
>>>I haven't thought about this deeply, but here are my initial thoughts:
>>>As long as the TML Layer is only responsible for "transport" and is not
>>>a decision-maker, I think the PL Layer (or someone other than the TML
>>>Layer) should have knowledge of the channels being setup.  This will
>>>especially be required to handle failure cases.  If the TML Layer is
>>>indeed the only entity aware of this, then it seems that in order to
>>>deal with failure cases, the TML Layer would need to take charge, and in
>>>that case, there may actually be more messaging required between peer
>>>TMLs.
>>>
>>
>>My view is that the PL should only worry about Forces Level messaging
>>i.e treat the TML as a black box; a wire if you may. It just sends
>>things down and they get to its peers.
>>The PL may "boot" the TML - but thats about as much control it has over
>>it.
>>Remember: in a PL<->TML interface, open() does not necessarily equate to
>>a TCP socket open() - it doesnt in our case. It just means you are
>>connected to the TML.
>>
>>
>>>Also, we haven't addressed HA in detail this draft.  I think some of the
>>>decisions we make will need to take into account HA requirements - it is
>>>hard to architect HA in at a later stage.
>>
>>I think we are there - whats missing is the details.
>>
>>Two levels of HA:
>>1) Transport - this is where TML is responsible. Its one layer below the
>>PL. If a physical link goes down or a socket dies then TML takes
>>necessary action to recover. If absolutely no possibility of such
>>recovery (eg when a CE or FE dies) then the PL layer needs to be
>>involved.
>>If you remove the relationship of knowledge of how many transport
>>connections actually exist from the PL level - this becomes more a
>>TML module worry and becomes specific to the hardware in which the TCP
>>TML was implemented on.
>>
>>2) a FE or CE PL. connection to the peer level is down. This is the
>>responsibility of the PL. If a CE disappears, then its clear the FE
>>needs to kick in the HA rules it has and either choose another CE or
>>hibernate until current one comes back (we discuss a few of these
>>schemes in the draft - may need some reviewing).
>>This is clearly a PL module worry.
>>
>>cheers,
>>jamal
>>
>
>
>

--
   Dr. Patrick Droz 			| dro@zurich.ibm.com
   IBM Zurich Research Laboratory 	| http://www.zurich.ibm.com/~dro
   Saumerstrasse 4 			| Tel. +41-1-724-85-25 CH-8803
   Rueschlikon/Switzerland 		| Fax. +41-1-724-85-78

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--------------ms040806040000070108050203--


2005
Message-Id: <WED.2.MAR.2005.152913.0100.>
Date: Wed, 2 Mar 2005 15:29:13 +0100
From: Patrick Droz <dro@zurich.ibm.com>
Organization: IBM Research
Subject: Re: WG question: Should draft-ansari-forces-discovery-01.txt be accepted as WG document?
MIME-Version: 1.0
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--------------ms040001070203030302080104
Content-Type: text/plain; charset=us-ascii; format=flowed
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Hi Joel,

I am supposed to meet with them and I will talk to them.
My assumptions is there won't be much opposition.

Regards,
Patrick

Joel M. Halpern wrote:

> Given this conclusion, the ansari draft seems to be a good place to start.
>
> I do believe we should get explicit AD permission to develop the
> necessary protocol.
>
> Yours,
> Joel M. Halpern
>
> At 06:32 PM 3/1/2005, Joel M. Halpern wrote:
>
>> You are correct.  I had thought the discovery was there, and it is not.
>>
>> This is unfortunate because there are a lot of pieces we are going to
>> have to reinvent, including congestion response and authentication in
>> order to make this work.
>>
>> The primary requirement then is the ability to discover, over any
>> interface, which FEs within the control of a CE are adjacent?
>> Presumably we must also monitor the liveness of that adjacency.  (No,
>> I am not going to suggest using a different protocol for monitoring.)
>> Presumably, we have scale and responsiveness requirements?
>>
>> Yours,
>> Joel
>>
>> At 01:40 PM 3/1/2005, Jamal Hadi Salim wrote:
>>
>>> BFD does NOT do discovery - it assumes you already know who your
>>> neighbors are and that all you want to detect liveliness between them.
>>> >From section
>
>
>

--
   Dr. Patrick Droz 			| dro@zurich.ibm.com
   IBM Zurich Research Laboratory 	| http://www.zurich.ibm.com/~dro
   Saumerstrasse 4 			| Tel. +41-1-724-85-25 CH-8803
   Rueschlikon/Switzerland 		| Fax. +41-1-724-85-78

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--------------ms040001070203030302080104--


2005
Message-Id: <WED.2.MAR.2005.112652.0800.>
Date: Wed, 2 Mar 2005 11:26:52 -0800
From: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
Subject: Re: I-D ACTION:draft-khosravi-forces-tcptml-01.txt
Comments: To: Robert Haas <rha@zurich.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Robert,

Thanks for your feedback! Pls see my comments inline below...=20

-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Robert Haas

I think we also have to provide a way to transport redirected packets=20
from the FE to the CE _without_ any encapsulation, i.e. _raw_
redirection.

The bad-length case raised by Joel could be supported with=20
encapsulation, as it anyway remains a corner case. And I don't think it=20
is difficult to distinguish such raw redirected packets from PL=20
messages, nor to prevent DoS by setting shapers in the FE. My main=20
motivation is to free the FEs from an unnecessary encapsulation load.

[HK] The biggest issue that I see for not encapsulating the redirected
packets in the PL header is interoperability. This is clearly a
tradeoff, you might get slightly better performance if you avoid any
encapsulation (although we haven't noticed any performance issues here)
but at the cost of Interoperability, bad-length case that Joel pointed
out, loss of protocol-inbuilt DoS prevention mechanisms, etc. IMHO,
Interoperability alone clearly out weighs any performance benefits here
(not considering the other issues, which are also significant).

BTW, if you have any performance nos here, pls do share them with us. I
would be very interested to know since we didn't see any such issues in
our implementation.

>BTW, Jamal, I agree very much with your design philosophy regarding
>doing away with TML messages/ header and keeping it simple. Just need
to
>analyze further if this is viable.

That has been my thinking as well. As Jamal described, some additions to

the FE LFB can replace special mcast control TML messages.

[HK] Good, we are all on the same page here...we will definitely strive
to achieve this goal of minimal TML overhead...it should be achievable.

Regards
Hormuzd


2005
Message-Id: <WED.2.MAR.2005.003155.0500.>
Date: Wed, 2 Mar 2005 00:31:55 -0500
From: Alex Audu <Aaudu2000@aol.com>
Subject: Re: I-D ACTION:draft-khosravi-forces-tcptml-01.txt
Comments: To: hadi@znyx.com
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit

Hi All,

What is this talk about doing away with TML headers?  Can
someone explain the rational behind this?  How are you going
to encode the TML messages meant for a remote peer in an
interoperable way if you don't have something like a well
defined, agreed upon message header?

Regards,
Alex.


In a message dated 2/28/2005 12:43:55 PM Eastern Standard Time, Jamal Hadi Salim <hadi@znyx.com> writes:

>Hi Shuchi,
>
>On Mon, 2005-02-28 at 11:48, Chawla, Shuchi wrote:
>> Jamal,
>>
>> Thanks for the feedback on the draft.  Comments below:
>>
>> TML Header (or lack thereof)
>> ----------------------------
>> I concur that it would simplify the protocol to not require a TML
>> header.  However, before we make that decision, I think we would want to
>> make sure we have covered ground with respect to all of the
>> communication that may be required between TML peers.
>
>A reasonable thing to do
>
>>  We had identified
>> 4 messages so far in this version of the draft:
>
>I am gonna assume TCP - which is in the context of this draft.
>
>> - 2 multicast support related messages
>
>I described the scheme in earlier email in response to Furquan - involve
>the FE Object and have the multicast be a PL/FE Object
>config/subscription issue.
>
>> - 1 heartbeat related message
>
>use TCP KEEPALIVE;
>
>> - 1 channel closure related message
>
>EOF is returned when a TCP connection is closed
>
>> Of these, the first three have been addressed in some form in these
>> discussions.  As we detail the protocol further, there may be other
>> messages that may come up - so we would need to ensure that all of these
>> messages can either be eliminated or dealt with in some other manner.
>> So, I just feel that this needs some more analysis.
>>
>
>Refer to what i said above. We are lucky to have implemented along the
>lines of what you propose (refer to the history i gave earlier)- that
>helped shape my views.
>
>> Separate Peer TML Control Channel
>> ---------------------------------
>> If we do require peer TML communication, in my opinion the use of a
>> separate communication channel for TML messaging is likely to complicate
>> the situation - in effect, this implies the setup/use of a "control
>> channel for a control channel".  I have not thought about all of the
>> implications, but here are some areas that the protocol would likely
>> need to address:
>> - What if one control channel comes up and the other doesn't?
>> - Guaranteeing message sequencing between these two control channels may
>> become more problematic
>> - The TML Layer even with this separate channel needs the ability to
>> handle two types of messages:
>>   o Those with a TML layer header received over the TML-TML
>> control channel
>>   o Those without a TML layer header received over the PL-PL
>> control channel
>
>In context of TCP - I would say kill this peer TML relationship. I
>probably wouldnt say the same for TIPC.
>
>
>> TML Versioning
>> --------------
>> Not having a TML Layer header would imply that the TML Layer does not
>> have a version associated with it.  Is there any other place the TML
>> version may be embedded?  If not, it would imply that changes may not be
>> made to the TML Layer separate from the PL Layer since any change that
>> might impact interoperability or modify the layer's behavior would need
>> to be reflected in the protocol version.  Since there are multiple TMLs
>> that are likely to exist, but a single PL, it would seem prudent that
>> TML changes be versioned independent of the PL Layer.  How would this be
>> achieved?
>>
>
>I see versioning as useful in the case where you have a shim header.
>Any other case - the versioning is how code is implemented; and if not
>I would say this is a C/FEM config interface issue. If someone wants to
>have CEM<->FEM communication they could do that; i would till think of
>it mostly as a config of the TML.
>
>> PL Layer knowledge of (Two) Channels
>> ------------------------------------
>> I haven't thought about this deeply, but here are my initial thoughts:
>> As long as the TML Layer is only responsible for "transport" and is not
>> a decision-maker, I think the PL Layer (or someone other than the TML
>> Layer) should have knowledge of the channels being setup.  This will
>> especially be required to handle failure cases.  If the TML Layer is
>> indeed the only entity aware of this, then it seems that in order to
>> deal with failure cases, the TML Layer would need to take charge, and in
>> that case, there may actually be more messaging required between peer
>> TMLs.
>>
>
>My view is that the PL should only worry about Forces Level messaging
>i.e treat the TML as a black box; a wire if you may. It just sends
>things down and they get to its peers.
>The PL may "boot" the TML - but thats about as much control it has over
>it.
>Remember: in a PL<->TML interface, open() does not necessarily equate to
>a TCP socket open() - it doesnt in our case. It just means you are
>connected to the TML.
>
>> Also, we haven't addressed HA in detail this draft.  I think some of the
>> decisions we make will need to take into account HA requirements - it is
>> hard to architect HA in at a later stage.
>
>I think we are there - whats missing is the details.
>
>Two levels of HA:
>1) Transport - this is where TML is responsible. Its one layer below the
>PL. If a physical link goes down or a socket dies then TML takes
>necessary action to recover. If absolutely no possibility of such
>recovery (eg when a CE or FE dies) then the PL layer needs to be
>involved.
>If you remove the relationship of knowledge of how many transport
>connections actually exist from the PL level - this becomes more a
>TML module worry and becomes specific to the hardware in which the TCP
>TML was implemented on.
>
>2) a FE or CE PL. connection to the peer level is down. This is the
>responsibility of the PL. If a CE disappears, then its clear the FE
>needs to kick in the HA rules it has and either choose another CE or
>hibernate until current one comes back (we discuss a few of these
>schemes in the draft - may need some reviewing).
>This is clearly a PL module worry.
>
>cheers,
>jamal
>


2005
Message-Id: <TUE.1.MAR.2005.201019.0100.>
Date: Tue, 1 Mar 2005 20:10:19 +0100
From: Robert Haas <rha@zurich.ibm.com>
Subject: Re: I-D ACTION:draft-khosravi-forces-tcptml-01.txt
Comments: To: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable

Hormuzd, All,

Khosravi, Hormuzd M wrote:

>Regarding this shim/TML header containing the length for redirected
>packets,
>I believe the ForCES PL header already has a length field that can be
>used for this purpose.
>The redirected packets are also transported within a ForCES PL message
>so the shim/TML header is really not needed if they are sent on a
>different connection/channel.
> =20
>

I think we also have to provide a way to transport redirected packets=20
from the FE to the CE _without_ any encapsulation, i.e. _raw_ redirection.

The bad-length case raised by Joel could be supported with=20
encapsulation, as it anyway remains a corner case. And I don't think it=20
is difficult to distinguish such raw redirected packets from PL=20
messages, nor to prevent DoS by setting shapers in the FE. My main=20
motivation is to free the FEs from an unnecessary encapsulation load.

>BTW, Jamal, I agree very much with your design philosophy regarding
>doing away with TML messages/ header and keeping it simple. Just need to
>analyze further if this is viable.
>
> =20
>
That has been my thinking as well. As Jamal described, some additions to=20
the FE LFB can replace special mcast control TML messages.

Regards,
-Robert

--=20
Dr. Robert R. Haas
IBM Zurich Research Laboratory
S=E4umerstrasse 4
CH-8803 R=FCschlikon/Switzerland
phone +41-44-724-8698  fax +41-44-724-8578  http://www.zurich.ibm.com/~rh=
a


2005
Message-Id: <TUE.1.MAR.2005.190628.0500.>
Date: Tue, 1 Mar 2005 19:06:28 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: WG question: Should draft-ansari-forces-discovery-01.txt be accepted as WG document?
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

In case it is unclear to the list, I explicitly apologies for dragging the
draft authors through this.  They were right all along.  (And no, they did
not ask for an apology.  I feel they deserve one.)
Yours,
Joel

At 06:44 PM 3/1/2005, Joel M. Halpern wrote:
>Given this conclusion, the ansari draft seems to be a good place to start.
>
>I do believe we should get explicit AD permission to develop the necessary
>protocol.
>
>Yours,
>Joel M. Halpern
>
>At 06:32 PM 3/1/2005, Joel M. Halpern wrote:
>>You are correct.  I had thought the discovery was there, and it is not.
>>
>>This is unfortunate because there are a lot of pieces we are going to
>>have to reinvent, including congestion response and authentication in
>>order to make this work.
>>
>>The primary requirement then is the ability to discover, over any
>>interface, which FEs within the control of a CE are adjacent?
>>Presumably we must also monitor the liveness of that adjacency.  (No, I
>>am not going to suggest using a different protocol for monitoring.)
>>Presumably, we have scale and responsiveness requirements?
>>
>>Yours,
>>Joel
>>
>>At 01:40 PM 3/1/2005, Jamal Hadi Salim wrote:
>>>BFD does NOT do discovery - it assumes you already know who your
>>>neighbors are and that all you want to detect liveliness between them.
>>> >From section


2005
Message-Id: <TUE.1.MAR.2005.184437.0500.>
Date: Tue, 1 Mar 2005 18:44:37 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: WG question: Should draft-ansari-forces-discovery-01.txt be accepted as WG document?
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

Given this conclusion, the ansari draft seems to be a good place to start.

I do believe we should get explicit AD permission to develop the necessary
protocol.

Yours,
Joel M. Halpern

At 06:32 PM 3/1/2005, Joel M. Halpern wrote:
>You are correct.  I had thought the discovery was there, and it is not.
>
>This is unfortunate because there are a lot of pieces we are going to have
>to reinvent, including congestion response and authentication in order to
>make this work.
>
>The primary requirement then is the ability to discover, over any
>interface, which FEs within the control of a CE are adjacent?
>Presumably we must also monitor the liveness of that adjacency.  (No, I am
>not going to suggest using a different protocol for monitoring.)
>Presumably, we have scale and responsiveness requirements?
>
>Yours,
>Joel
>
>At 01:40 PM 3/1/2005, Jamal Hadi Salim wrote:
>>BFD does NOT do discovery - it assumes you already know who your
>>neighbors are and that all you want to detect liveliness between them.
>> >From section


2005
Message-Id: <TUE.1.MAR.2005.183229.0500.>
Date: Tue, 1 Mar 2005 18:32:29 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: WG question: Should draft-ansari-forces-discovery-01.txt be accepted as WG document?
Comments: To: hadi@znyx.com
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed

You are correct.  I had thought the discovery was there, and it is not.

This is unfortunate because there are a lot of pieces we are going to have
to reinvent, including congestion response and authentication in order to
make this work.

The primary requirement then is the ability to discover, over any
interface, which FEs within the control of a CE are adjacent?
Presumably we must also monitor the liveness of that adjacency.  (No, I am
not going to suggest using a different protocol for monitoring.)
Presumably, we have scale and responsiveness requirements?

Yours,
Joel

At 01:40 PM 3/1/2005, Jamal Hadi Salim wrote:
>BFD does NOT do discovery - it assumes you already know who your
>neighbors are and that all you want to detect liveliness between them.
> >From section


2005
Message-Id: <TUE.1.MAR.2005.154015.0800.>
Date: Tue, 1 Mar 2005 15:40:15 -0800
From: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
Subject: Re: WG question: Should draft-ansari-forces-discovery-01.txt be accepted as WG document?
Comments: To: "Joel M. Halpern" <joel@stevecrocker.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

=20
-----Original Message-----
From: Forwarding and Control Element Separation
[mailto:FORCES@PEACH.EASE.LSOFT.COM] On Behalf Of Joel M. Halpern

The primary requirement then is the ability to discover, over any=20
interface, which FEs within the control of a CE are adjacent?

[Yes, Glad we are on the same page now! :-)]

Hormuzd


2005
Message-Id: <TUE.1.MAR.2005.134047.0500.>
Date: Tue, 1 Mar 2005 13:40:47 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: Znyx Networks
Subject: Re: WG question: Should draft-ansari-forces-discovery-01.txt be accepted as WG document?
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

On Tue, 2005-03-01 at 12:24, Joel M. Halpern wrote:

[..]
> We do not need full link state information.  However, the more I look
> the more inclined I am to use BFD.

[..]

> The draft notes that the mechanism is suitable for use with liveness
> detection for tunnels.
> Given that it provides detection and liveness monitoring of
> adjacencies, it has the relevant properties.  If we need extra
> information carried, we can work with the BFD working group to add
> them.
>
> I would expect the IESG to look askance at us inventing a protocol to
> do a job that is already being done.
>
> "Too heavyweight" is rarely the a good reason.  And particularly when
> the protocol has been designed from the bottom up to be as lightweight
> as possible, one has to assume the additional elements are there for a
> reason.  Remember that BFD was specifically designed for
> implementation in the forwarding engine of a system.
>

I just remembered why BFD would be the wrong protocol after reading a
couple of pages of the base draft. Its very important we capture this in
the draft.

- BFD's main focus is path liveliness.

- The protocol being pushed for WG item is _FE neighbor discovery_.

Recall that mythical command: "feconfig FE0 yourfeneighbor FE1
yourIFtoneigh CSIX1 IFatneigh CSIX0". Thats what we need to achieve as a
minimal.

BFD does NOT do discovery - it assumes you already know who your
neighbors are and that all you want to detect liveliness between them.
>From section

-------
3.1. Addressing and Session Establishment

   A BFD session is established based on the needs of the application
   that will be making use of it.  It is up to the application to
   determine the need for BFD, and the addresses to use--there is no
   discovery mechanism in BFD.  For example, an OSPF [OSPF]
   implementation may request a BFD session to be established to a
   neighbor discovered using the OSPF Hello protocol.

---------

So clearly the basic desires are very different.

Having said that in the topology LFB draft, we do somehow assume that
because we have hellos running around, we can also assume that livelines
detection is a given(i.e. free). Perhaps we need to decouple the two or
clearly make the liveliness feature as an optional add on. I would
rather leave it there.

cheers,
jamal


2005
Message-Id: <TUE.1.MAR.2005.122451.0500.>
Date: Tue, 1 Mar 2005 12:24:51 -0500
From: "Joel M. Halpern" <joel@stevecrocker.com>
Subject: Re: WG question: Should draft-ansari-forces-discovery-01.txt be accepted as WG document?
Mime-Version: 1.0
Content-Type: text/html; charset="us-ascii"

<html>
<body>
I may be missing something, but I don't think we are trying to discover a
topology.&nbsp; We are trying to discover which FEs that are under
control of a single CE are directly adjacent to each other.&nbsp; So
sending and receiving OSPF or IS-IS hellos provides the necessary
information.<br>
We do not need full link state information.&nbsp; However, the more I
look the more inclined I am to use BFD.<br><br>
Looking at available drafts on this problem, I find<br>
&nbsp;&nbsp;&nbsp; draft-ietf-bfd-v4v6-1hop-01.txt<br>
which states in its introduction:<br><br>
<pre>&nbsp;&nbsp; One very desirable application for BFD [BFD] is to
track IPv4
&nbsp;&nbsp; and IPv6 connectivity between directly-connected systems.
&nbsp;&nbsp; This could be used to supplant the detection mechanisms in
&nbsp;&nbsp; IS-IS and OSPF, or to monitor router-host connectivity,
&nbsp;&nbsp; among other applications.

&nbsp;&nbsp; This document describes the particulars necessary to use
BFD
&nbsp;&nbsp; in this environment,

</pre>The draft notes that the mechanism is suitable for use with
liveness detection for tunnels.<br>
Given that it provides detection and liveness monitoring of adjacencies,
it has the relevant properties.&nbsp; If we need extra information
carried, we can work with the BFD working group to add them.<br><br>
I would expect the IESG to look askance at us inventing a protocol to do
a job that is already being done.<br><br>
&quot;Too heavyweight&quot; is rarely the a good reason.&nbsp; And
particularly when the protocol has been designed from the bottom up to be
as lightweight as possible, one has to assume the additional elements are
there for a reason.&nbsp; Remember that BFD was specifically designed for
implementation in the forwarding engine of a system.  <br><br>
Yours,<br>
Joel M. Halpern<br><br>
At 11:32 AM 3/1/2005, Furquan Ansari wrote:<br>
<blockquote type=cite class=cite cite="">Not sure what you mean by
routing information, but I presume link state information in the case of
OSPF. If you are not<br>
exchanging link state information, then you are not generating the
topology that you actually are intersted in.</blockquote></body>
</html>


2005
Message-Id: <TUE.1.MAR.2005.113258.0500.>
Date: Tue, 1 Mar 2005 11:32:58 -0500
From: Furquan Ansari <furquan@lucent.com>
Organization: Lucent Technologies
Subject: Re: WG question: Should draft-ansari-forces-discovery-01.txt be accepted as WG document?
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

Joel,
 Comments inline.....

Joel M. Halpern wrote:

> If we assume that the interfaces are dedicated to being either
> internal or external to the NE, and we assume that the CE actually has
> per-interface OSPF configuration, then it won't start OSPF on those
> interfaces.
> In that case, a protocol such as BFD would seem sensible.

OSPF and other link state protocols are, in general, configured and
enabled on a per-interface basis - surely one could
aggregate the configuration and enable on a whole bunch at a time (but
from the protocol perspective, it is still on
per-interface). Further, one doesn't necessarily need to dedicate an
interface to be either internal or external - it's a

As for BFD, it is a possibility - as has been mentioned in the draft.
However, the focus of BFD is not topology discovery, it is detection of
faults in bi-directional paths (One can start from there and extend it,
as a possibility.
I wonder if it will become heavy-weight with all the other features in
it that may not be needed for our purposes). It
provides the necessary (hello/lieveness), but not the sufficient
condition (topology).

>
> I could equally easily imagine the normal configuration being
> "run OSPF'
> "noroute internal"
> which would enable OSPF on all interfaces, and then tell the enigne
> not to bother exchanging routing information on internal interfaces.

Not sure what you mean by routing information, but I presume link state
information in the case of OSPF. If you are not
exchanging link state information, then you are not generating the
topology that you actually are intersted in.

If link state information is in fact generated and passed around and
only routes shouldn't be calculated using these
links, I am not sure how one would go about doing it without changing
OSPF. Like I mentioned before, this functionality
can be achieved by running a completely separate instance of OSPF, if
one likes. But once you enable OSPF on all interfaces, the link state
information will be flooded out to the rest of the network and the
resulting link state database obtained will be used for route
calculation  - with the internal nodes and link exposed to the external
network elements.

>
> There are probably other existing alternatives I have not thought of
> that can be used.
> We should be very cautious before inventing another protocol for a
> problem that comes up repeatedly (neighbor detection.)
>
> It may be that we do need a very light weight specialized protocol.
> I want to understand what problem it is to solve and its relationship
> to existing work before discussing the design details of the protocol.

I guess this is a very reasonable request and we should certainly
discuss it more.

Thanks,

>
> At 04:40 PM 2/28/2005, Furquan Ansari wrote:
>
>> Joel,
>>    I am trying to understand what you are saying. Let's take this
>> simple example of an NE with three
>> different FEs in it - See figure below. If a routing protocol such as
>> OSPF is started on this NE, the CE
>> will send hello packets to neighboring NEs (NE2 and NE3) only through
>> interfaces configured in OSPF -
>> which would be interface "D" on FE1 and "B" on FE2. It would not be
>> correct behavior if the CE
>> decides to send the routing protocol Hellos through all the
>> interfaces on an FE - that haven't been
>> configured for that routing protocol - i.e. CE should not send hellos
>> on interface "B" and "C" on FE1
>> and "C" and "D" of FE2. Further FE3 is completely internal to the NE
>> and who is it sending it's hello
>> packets to?
>> The discovery is meant to discover the internal topology - albiet
>> through as simple a mechanim as
>> a hello protocol - but has been delineated from the routing protocol
>> Hellos.
>>
>> Thanks,
>

--
Furquan Ansari
Bell Labs Research			Ph : 732-949-5249
Holmdel, NJ				Fax: 732-949-4556


2005
Message-Id: <TUE.1.MAR.2005.111744.0500.>
Date: Tue, 1 Mar 2005 11:17:44 -0500
From: Jamal Hadi Salim <hadi@znyx.com>
Organization: Znyx Networks
Subject: Re: WG question: Should draft-ansari-forces-discovery-01.txt be accepted as WG document?
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

This takes me back to where i had the post on the neighbor info in the
FEObject.

There will always be a need to configure neighbors - Joel, do you
disagree with this statement? i.e this is a fundamental aspect of what
we need to do in Forces first deliverable even if its for just IPV4
forwarding.

Let me illustrate with an example - hopefully this will help other
people tune into the discussion.

Consider FE0 (that for the sake of illustration) is connected to 3
neighbors, FE1 via a CSIX fabric interface (lets call it CSIX1); FE2 via
a L2TP tunnel (lets call it l2pt0) and, FE3 via ethernet interface that
we shall call eth0. I could have just shown CSIX or SPIx fabric
connection instead which is more realistic, but this example
demonstrates the variety of interfaces that could be found in a forces
NE.

With the above knowledge about each FE, a NE topology can be computed if
needed by the CE.

In the minimal a simple tool could be written to achieve this via static
config, example when you run this at the CE:

feconfig FE0 yourfeneighbor FE1 yourIFtoneigh CSIX1 IFatneigh CSIX0
feconfig FE0 yourfeneighbor FE2 yourIFtoneigh l2tp0 IFatneigh l2tp1
feconfig FE0 yourfeneighbor FE3 yourIFtoneigh eth0 IFatneigh eth1

What you just did is teach FE0 who its neighbors are.

CSIX1 is an example of whats known as an "internal" interface. It is
never exposed to the outside world.

Now show me one existing protocol that can do what the feconfig neighbor
configuration above does dynamically without:

a) being heavyweight (the 1000 other features BFD has)
b) insufficient for the core need (eg OSPF is fine if you have a V4/6
address but would not work for CSIX interfaces which have no IP
addresses)

I contend that the amount of effort to hack any existing protocol
to meet these desires is more intensive than to write a simple
protocol that is contrained within the NE.

cheers,
jamal