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Subject: TEST -- IGNORE




_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
_/                                                                      _/
_/  Kaj Tesink                                                          _/
_/  Bellcore                                                            _/
_/  - Broadband Data Services & Consulting  vmail (908) 758-5254        _/
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Hi,

Greg Bernstein no longer works here.
I do not have any forwarding address available.
If this is a mailing list please remove gbernste@lima.raynet.com.

Thanks,
Ed


> From Mailer-Daemon@lima Tue Nov  1 16:56:44 1994
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To: atommib@thumper.bellcore.com
Subject: atmInterfaceMyNeighborIpAddress
Date: Tue, 08 Nov 94 14:56:18 EST
Sender:ietf-archive-request@IETF.CNRI.Reston.VA.US
From: "Aleksey Y. Romanov" <romanov@nacto.lkg.dec.com>


Hi,

               atmInterfaceMyNeighborIpAddress OBJECT-TYPE
                    SYNTAX       IpAddress
                    MAX-ACCESS   read-write
                    STATUS       current
                    DESCRIPTION
                     "The IP address of the neighbor system connected to
                      the  far end of this interface, to which a Network
                      Management Station can send SNMP messages, as IP
                      datagrams sent to UDP port 161, in order to access
                      network management information concerning the
                      operation of that system.  Note that the value
                      of this object may be obtained in different ways,
                      e.g., by manual configuration, or through ILMI
                      interaction with the neighbor system."
                    ::= { atmInterfaceConfEntry 11 }

What shoube a value for this object if neighbor does not support
IP, does not support SNMP or this value is not detected yet (e.g.
because link is down) ?

My idea is 0.0.0.0.

Opinions ?

Aleksey




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From: Drew Perkins <ddp@fore.com>
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To: atommib@thumper.bellcore.com, romanov@nacto.lkg.dec.com
Subject: Re: atmInterfaceMyNeighborIpAddress

I would say noSuchName.

Drew
-----------------------------------------------------------------
FORE Systems, Inc.			Tel: (412) 772-6527
174 Thorn Hill Road			Fax: (412) 772-6500
Warrendale, PA 15086-7535		Email: ddp@fore.com

>                atmInterfaceMyNeighborIpAddress OBJECT-TYPE
>                     SYNTAX       IpAddress
>                     MAX-ACCESS   read-write
>                     STATUS       current
>                     DESCRIPTION
>                      "The IP address of the neighbor system connected to
>                       the  far end of this interface, to which a Network
>                       Management Station can send SNMP messages, as IP
>                       datagrams sent to UDP port 161, in order to access
>                       network management information concerning the
>                       operation of that system.  Note that the value
>                       of this object may be obtained in different ways,
>                       e.g., by manual configuration, or through ILMI
>                       interaction with the neighbor system."
>                     ::= { atmInterfaceConfEntry 11 }
> 
> What shoube a value for this object if neighbor does not support
> IP, does not support SNMP or this value is not detected yet (e.g.
> because link is down) ?
> 
> My idea is 0.0.0.0.
> 
> Opinions ?
> 
> Aleksey
> 
> 
> 
> 
> 
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From: Keith McCloghrie <kzm@cisco.com>
Message-Id: <199411140223.SAA03743@jack.cisco.com>
Subject: Re: atmInterfaceMyNeighborIpAddress
To: Drew Perkins <ddp@fore.com>
Date: Sun, 13 Nov 94 18:23:59 PST
Cc: atommib@thumper.bellcore.com, romanov@nacto.lkg.dec.com
In-Reply-To: <9411082040.AA11525@loach.fore.com>; from "Drew Perkins" at Nov 8, 94 3:40 pm
X-Mailer: ELM [version 2.3 PL11]

I think Aleksey's suggestion of 0.0.0.0 is better than noSuchName
since it allows the NMS to distinguish between the situations
where the agent doesn't support this object, and the value is not 
obtainable via the ILMI.
 
Keith.

> I would say noSuchName.
> 
> Drew
>
> >                atmInterfaceMyNeighborIpAddress OBJECT-TYPE
> >                     SYNTAX       IpAddress
> >                     MAX-ACCESS   read-write
> >                     STATUS       current
> >                     DESCRIPTION
> >                      "The IP address of the neighbor system connected to
> >                       the  far end of this interface, to which a Network
> >                       Management Station can send SNMP messages, as IP
> >                       datagrams sent to UDP port 161, in order to access
> >                       network management information concerning the
> >                       operation of that system.  Note that the value
> >                       of this object may be obtained in different ways,
> >                       e.g., by manual configuration, or through ILMI
> >                       interaction with the neighbor system."
> >                     ::= { atmInterfaceConfEntry 11 }
> > 
> > What shoube a value for this object if neighbor does not support
> > IP, does not support SNMP or this value is not detected yet (e.g.
> > because link is down) ?
> > 
> > My idea is 0.0.0.0.
> > 
> > Opinions ?
> > 
> > Aleksey
> 
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To: Keith McCloghrie <kzm@cisco.com>
Subject: Re: atmInterfaceMyNeighborIpAddress 
Cc: atommib@thumper.bellcore.com, ddp@fore.com
Date: Mon, 14 Nov 94 11:36:56 EST
Sender:ietf-archive-request@IETF.CNRI.Reston.VA.US
From: "Aleksey Y. Romanov" <romanov@nacto.lkg.dec.com>


> I think Aleksey's suggestion of 0.0.0.0 is better than noSuchName
> since it allows the NMS to distinguish between the situations
> where the agent doesn't support this object, and the value is not 
> obtainable via the ILMI.
>  
> Keith.
> 
> > I would say noSuchName.

It could not be noSuchName because atmInterfaceMyNeighborIpAddress
is mandatory part of atmInterfaceConfGroup.

> > Drew

Aleksey


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Original-From: mare!guru (g.sundararaman)
To: atommib-request@fore.com, atommib@thumper.bellcore.com
Subject: Please unsubscribe


Please unsubscribe

	guru@mare.att.com
	guru@garage.att.com

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From: "Kim.Laraqui" <Kim.Laraqui@haninge.trab.se>
Message-Id: <9411241144.AA05999@yankees.haninge.trab.se>
To: atommib@thumper.bellcore.com
Subject: Three questions on RFC1695


is the ifPhysAddress (in the ifTable for ifType=37,ATM) always
equivalent to an E164 address?

Has anyone thought of using RFC1695/M3 for network management (after
additional definitions to accomodate for this in the MIB, e.g. to allow
the use of shadow ifEntry in one M3-agent which would actually be
managed by another M3 agent)?

Is there a NM-strategy from the part of IETF for ATM networks? It seems
to me that by starting to standardize network management from the ATM
UNI, which gave SNMP advantages since customers expect SNMP, SNMP has
slowly started to penetrate into management systems well beyond the UNI
(e.g. through ILMI, which I quess will be used also for BICI and
BISSI.  Some public network operators in Europe will be very
surprised). 

If we assume that ATM becomes a key data/telecom network for the next
decades, and that the ATM Forum IS the marketplace, then we may end up
having SNMP for Telecom as well as datacom network management all over
the place. We're not talking about management of the odd IP-router in a
public network but of the basic elements of you ATM backbone! The SNMP UNI
offensive does not seem to be balanced by a CMIP BICI one. Is this
something the IETF would encourage? I'm not so sure about that...


Cheers

/kim

-----------------------
(Mr.) KIM LARAQUI
TELIA RESEARCH
S-13680 HANINGE
SWEDEN
PHONE:	+46.8.7075568
FAX:	+46.8.7075480
-----------------------



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From: Kaj Tesink <kaj@cc.bellcore.com>
Subject: Re: Three questions on RFC1695

At 11:44 AM 11/24/94, Kim.Laraqui wrote:
>is the ifPhysAddress (in the ifTable for ifType=37,ATM) always
>equivalent to an E164 address?

no, not always; see p.9, sec.6.2.1 of 1695
>
>Has anyone thought of using RFC1695/M3 for network management (after
>additional definitions to accomodate for this in the MIB, e.g. to allow
>the use of shadow ifEntry in one M3-agent which would actually be
>managed by another M3 agent)?

not sure what you mean here; is this a proxy scenario?
note also that 1695 has been written as a general purpose
mib for atm interfaces, not specifically for M3. however,
as the ATMForum has demonstrated, it can successfully be used
for the purpose of M3.
>
>Is there a NM-strategy from the part of IETF for ATM networks? It seems
>to me that by starting to standardize network management from the ATM
>UNI, which gave SNMP advantages since customers expect SNMP, SNMP has
>slowly started to penetrate into management systems well beyond the UNI
>(e.g. through ILMI, which I quess will be used also for BICI and
>BISSI.  Some public network operators in Europe will be very
>surprised). 
>
>If we assume that ATM becomes a key data/telecom network for the next
>decades, and that the ATM Forum IS the marketplace, then we may end up
>having SNMP for Telecom as well as datacom network management all over
>the place. We're not talking about management of the odd IP-router in a
>public network but of the basic elements of you ATM backbone! The SNMP UNI
>offensive does not seem to be balanced by a CMIP BICI one. Is this
>something the IETF would encourage? I'm not so sure about that...

so what's the question or proposal?
note that the IETF is and should not be interested in offensives
and protocol wars. in the case of the ATM MIB the IETF has simply
published an SNMP based MIB to be used by those folks who elect
to use it. a good number of people seem to be implementing it.
this doesnt preclude folks to use other protocols.

kaj


_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
_/                                                                      _/
_/  Kaj Tesink                                                          _/
_/  Bellcore                                                            _/
_/  - Broadband Data Services & Consulting  vmail (908) 758-5254        _/
_/    331 Newman Springs Rd.                email kaj@cc.bellcore.com   _/
_/    Red Bank, NJ 07701                  faxmail (908) 758-4196        _/
_/                                                                      _/
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/


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To: atommib@thumper.bellcore.com
Cc: rns@fore.com
Subject: Some questions
Date: Mon, 28 Nov 1994 18:34:42 -0500
Sender:ietf-archive-request@IETF.CNRI.Reston.VA.US
From: Bob Sidebotham <rns@fore.com>

Hi. I'm new to this group, and I have a couple of questions with
regard to terminating VPL's and VCL's as represented in the ATM MIB:

1. In the discussion of the VPL Table, RFC 1695 states that "if the
VPL terminates a VPC in the ATM host or switch, the manager turns on
the atmVplAdminStatus to up(1) to turn the VPL traffic flow on."

As I interpret this, no traffic should flow on related VCLs (i.e. with
the same value of vpi as the VPL entry) if atmVplAdminStatus is set to
"down", because a VPC being terminated in switch simply means that,
although the path is ended, individual channels may still be routed by
the switch. But what if there is no VPL entry at all, or the
atmVplAdminStatus is not instantiated? Can a VCL entry be created
without a corresponding VPL entry? Other than the snippet, above, I
can't find anything that might require this.
 
2. In the discussion of the VCL Table, the RFC states that "if the VCL
terminates a VCC in the ATM host or switch, the manager turns on the
atmVclAdminStatus to up(1) to turn the VCL traffic flow on."

One way to terminate a VCC in a switch would be to instantiate two
VCL's, one representing a channel on an external port, one a channel
on the "other side" of the internal "Proprietary Virtual Interface"
(as discussed in section 8.4). These are then cross-connected and the
appropriate VCL is created for the "Proprietary Virtual Interface" and
turned "on". Cells are then routed via the cross-connect to the switch
control port and read via the virtual interface. Unfortunately, there
is no explicit information available to the manager relating the
control port and its alter ego, the "Proprietary Virtual
Interface". Do I have the right model here?

I have some more questions, but I think I'll reserve them until I've seen
the responses to these!

Thanks,
Bob Sidebotham

FORE Systems
rns@fore.com



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To: atommib@thumper.bellcore.com
Cc: rns@fore.com
Subject: Some questions
Date: Mon, 28 Nov 1994 18:42:21 -0500
Sender:ietf-archive-request@IETF.CNRI.Reston.VA.US
From: Bob Sidebotham <rns@fore.com>

Hi. I'm new to this group, and I have a couple of questions with
regard to terminating VPL's and VCL's as represented in the ATM MIB:

1. In the discussion of the VPL Table, RFC 1695 states that "if the
VPL terminates a VPC in the ATM host or switch, the manager turns on
the atmVplAdminStatus to up(1) to turn the VPL traffic flow on."

As I interpret this, no traffic should flow on related VCLs (i.e. with
the same value of vpi as the VPL entry) if atmVplAdminStatus is set to
"down", because a VPC being terminated in switch simply means that,
although the path is ended, individual channels may still be routed by
the switch. But what if there is no VPL entry at all, or the
atmVplAdminStatus is not instantiated? Can a VCL entry be created
without a corresponding VPL entry? Other than the snippet, above, I
can't find anything that might require this.
 
2. In the discussion of the VCL Table, the RFC states that "if the VCL
terminates a VCC in the ATM host or switch, the manager turns on the
atmVclAdminStatus to up(1) to turn the VCL traffic flow on."

One way to terminate a VCC in a switch would be to instantiate two
VCL's, one representing a channel on an external port, one a channel
on the "other side" of the internal "Proprietary Virtual Interface"
(as discussed in section 8.4). These are then cross-connected and the
appropriate VCL is created for the "Proprietary Virtual Interface" and
turned "on". Cells are then routed via the cross-connect to the switch
control port and read via the virtual interface. Unfortunately, there
is no explicit information available to the manager relating the
control port and its alter ego, the "Proprietary Virtual
Interface". Do I have the right model here?

I have some more questions, but I think I'll reserve them until I've seen
the responses to these!

Thanks,
Bob Sidebotham

FORE Systems
rns@fore.com



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To: atommib@thumper.bellcore.com
Cc: rns@fore.com
Subject: createAndGo
Date: Tue, 29 Nov 1994 14:31:00 -0500
Sender:ietf-archive-request@IETF.CNRI.Reston.VA.US
From: Bob Sidebotham <rns@fore.com>

Another puzzle:

The ATM MIB specification goes to some pains to describe row creation
for several of the tables, and includes references in these cases to
the "createAndGo" operation specified in RFC 1443 (Textual Conventions
for SNMPV2). For other tables, however, no mention is made of
"createAndGo", and it's left to the reader to lookup the definition of
"RowStatus" in RFC 1443.

The reason I ask is because, in the interests of simplicity and
correctness of operation, I would prefer to leave out the createAndGo
semantics altogether. My reading of RFC1443 indicates that I have the
right to do this, while still being compliant with that
RFC. Unfortunately, for all the detail of the specification, this RFC
is not very helpful. It says (RFC 1443, p15):

 "The management station issues a management protocol set operation
  which sets the desired instance of the status column to
  'createAndWait'. If the agent is unwilling to process a request of
  this sort, the set operation fails with an error of 'wrongValue'.  (As
  a consequence, such an agent must be prepared to accept a single
  management protocol set operation, i.e., interaction 2a above,
  containing all of the columns indicated by its column requirements.)"

This seems, indirectly, to give license to *not* implement the
"createAndGo" operation. Further evidence is supplied by Stalling's
SNMP* book, p289:

 "Both options are available and an agent implementor may decide which
  option to support for each table."

(This actually seems a broader conclusion than I would make--it puts
the onus on the management station to support *both* styles of row
creation).

My conclusion is that for the tables in ATM MIB for which the creation
method is not specified, that it's OK to implement just the "createAndWait"
method. For the tables where both methods are specified, I'm puzzled, since
RFC 1443 basically makes this an *agent* responsibility, but RFC 1695
specifies it.

Any insights on this? If "createAndGo" is not implemented for any
tables in ATM MIB, is the implementation in conformance with RFC 1695?
An alternative question is: is RFC1695 in conformance with RFC1443 by
specifying both types of row creation?

Sorry for the nit-picking, but these details do make the difference!

Thanks,
Bob Sidebotham

rns@fore.com
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To: atommib@thumper.bellcore.com
Cc: rns@fore.com
Subject: Modifying a row
Date: Tue, 29 Nov 1994 16:08:14 -0500
Sender:ietf-archive-request@IETF.CNRI.Reston.VA.US
From: Bob Sidebotham <rns@fore.com>

This is another nit, perhaps.

The intent of ATM MIB with respect to modification of rows is unclear.

Let's take, for example, the ATM Traffic Descriptor Parameter
Table. In the introductory comments for this table, it is stated that:

  -- A row in the atmTrafficDescrParamable is deleted
  -- by setting the atmTrafficDescrRowStatus to destroy(6).
  -- The agent will check whether this row is still in use
  -- by any entry of the atmVplTable or atmVclTable.
  -- The agent denies the request if the row is still in
  -- use.

Under the DESCRIPTION of atmTrafficDescrRowStatus, it is stated that:

  "This object is used to create
   a new row or modify or delete an
   existing row in this table."

Note that the DESCRIPTION provides for both modification *and*
deletion, but the introductory comments only talk about deletion.

Now in RFC 1443, it is stated under a "NOTE WELL", that:

  "This textual convention may be used for a MIB
   table, irrespective of whether the values of
   that table's conceptual rows are able to be
   modified while it is active, or whether its
   conceptual rows must be taken out of service
   in order to be modified.  That is, it is the
   responsibility of the DESCRIPTION clause of
   the status column to specify whether the
   status column must be 'notInService' in order
   for the value of some other column of the
   same conceptual row to be modified."

Clearly, the DESCRIPTION clause, above, does not comply with this
requirement.

Anyway, apart from the legalistic interpretation of the MIB, can
anyone tell me whether the intention is that the QOS parameters
associated with VPL's or VCL's could really be modified en masse, just
by changing a single row of this table? And if they are, can this
table be modified (1) by just modifying an entry, or (2) by setting
the status value to 'notInService' and then modifying the entry? If
the latter, under what circumstances can the status be changed to
'notInService'? That is, are there similar constraints to the
constraints mentioned in the comment section for deleting a row?

I suspect there are similar questions that can be asked about other
tables in the MIB.

Comments?

Bob Sidebotham
FORE Systems

rns@fore.com
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Sender:ietf-archive-request@IETF.CNRI.Reston.VA.US
From: Kaj Tesink <kaj@cc.bellcore.com>
Subject: Re: createAndGo
Cc: rns@fore.com

At 7:30 PM 11/29/94, Bob Sidebotham wrote:
>Another puzzle:
>
>The ATM MIB specification goes to some pains to describe row creation
>for several of the tables, and includes references in these cases to
>the "createAndGo" operation specified in RFC 1443 (Textual Conventions
>for SNMPV2). For other tables, however, no mention is made of
>"createAndGo", and it's left to the reader to lookup the definition of
>"RowStatus" in RFC 1443.
>
>The reason I ask is because, in the interests of simplicity and
>correctness of operation, I would prefer to leave out the createAndGo
>semantics altogether. My reading of RFC1443 indicates that I have the
>right to do this, while still being compliant with that
>RFC. Unfortunately, for all the detail of the specification, this RFC
>is not very helpful. It says (RFC 1443, p15):
>
> "The management station issues a management protocol set operation
>  which sets the desired instance of the status column to
>  'createAndWait'. If the agent is unwilling to process a request of
>  this sort, the set operation fails with an error of 'wrongValue'.  (As
>  a consequence, such an agent must be prepared to accept a single
>  management protocol set operation, i.e., interaction 2a above,
>  containing all of the columns indicated by its column requirements.)"
>
>This seems, indirectly, to give license to *not* implement the
>"createAndGo" operation. Further evidence is supplied by Stalling's
>SNMP* book, p289:
>
> "Both options are available and an agent implementor may decide which
>  option to support for each table."

my observation would be that the conformance statement is the ultimate
judge on what should be supported. that answer may not be very satisfactory though. so there is also an issue of "what makes sense".
the "either", "or" scenario that you paint above may in practice
not really apply since if an agent can handle the complexity of
the negotiated approach, it can likely also handle the one-shot approach.
>
>(This actually seems a broader conclusion than I would make--it puts
>the onus on the management station to support *both* styles of row
>creation).
>
>My conclusion is that for the tables in ATM MIB for which the creation
>method is not specified, that it's OK to implement just the "createAndWait"
>method. For the tables where both methods are specified, I'm puzzled, since
>RFC 1443 basically makes this an *agent* responsibility, but RFC 1695
>specifies it.

my reading is that by specifying both methods 1695 allows agent implementors
to choose whether to support just the one-shot or also the negotiated
approach. you may also notice that 1695 points out a preference for
the negotiated approach (e.g., top of p.35).
>
>Any insights on this? If "createAndGo" is not implemented for any
>tables in ATM MIB, is the implementation in conformance with RFC 1695?
>An alternative question is: is RFC1695 in conformance with RFC1443 by
>specifying both types of row creation?
>
>Sorry for the nit-picking, but these details do make the difference!

yes. as has been described in the latest issue of The Simple Times
the negotiated approach does have real advantages. so i would
recommend to go with that.
>
>Thanks,
>Bob Sidebotham
>
>rns@fore.com


_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
_/                                                                      _/
_/  Kaj Tesink                                                          _/
_/  Bellcore                                                            _/
_/  - Broadband Data Services & Consulting  vmail (908) 758-5254        _/
_/    331 Newman Springs Rd.                email kaj@cc.bellcore.com   _/
_/    Red Bank, NJ 07701                  faxmail (908) 758-4196        _/
_/                                                                      _/
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/


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To: Bob Sidebotham <rns@fore.com>, atommib@thumper.bellcore.com
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From: Kaj Tesink <kaj@cc.bellcore.com>
Subject: Re: Some questions
Cc: rns@fore.com

At 11:42 PM 11/28/94, Bob Sidebotham wrote:
>Hi. I'm new to this group, and I have a couple of questions with
>regard to terminating VPL's and VCL's as represented in the ATM MIB:
>
>1. In the discussion of the VPL Table, RFC 1695 states that "if the
>VPL terminates a VPC in the ATM host or switch, the manager turns on
>the atmVplAdminStatus to up(1) to turn the VPL traffic flow on."
>
>As I interpret this, no traffic should flow on related VCLs (i.e. with
>the same value of vpi as the VPL entry) if atmVplAdminStatus is set to
>"down", because a VPC being terminated in switch simply means that,
>although the path is ended, individual channels may still be routed by
>the switch. But what if there is no VPL entry at all, or the
>atmVplAdminStatus is not instantiated? Can a VCL entry be created
>without a corresponding VPL entry? Other than the snippet, above, I
>can't find anything that might require this.

it strikes me that an agent should refuse this request
since a critical resource (the underlying VPL) is not in place.
this is indeed not explicitly spelled out, but consider
what alternative there is ...

btw you may want to check out the latest issue of the Simple Times
which has some more info on the whole procedure.

> 
>2. In the discussion of the VCL Table, the RFC states that "if the VCL
>terminates a VCC in the ATM host or switch, the manager turns on the
>atmVclAdminStatus to up(1) to turn the VCL traffic flow on."
>
>One way to terminate a VCC in a switch would be to instantiate two
>VCL's, one representing a channel on an external port, one a channel
>on the "other side" of the internal "Proprietary Virtual Interface"
>(as discussed in section 8.4). These are then cross-connected and the
>appropriate VCL is created for the "Proprietary Virtual Interface" and
>turned "on". Cells are then routed via the cross-connect to the switch
>control port and read via the virtual interface. Unfortunately, there
>is no explicit information available to the manager relating the
>control port and its alter ego, the "Proprietary Virtual
>Interface". Do I have the right model here?

i think so. you may also want to read section 8.1 on this.
>
>I have some more questions, but I think I'll reserve them until I've seen
>the responses to these!
>
>Thanks,
>Bob Sidebotham
>
>FORE Systems
>rns@fore.com


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_/                                                                      _/
_/  Kaj Tesink                                                          _/
_/  Bellcore                                                            _/
_/  - Broadband Data Services & Consulting  vmail (908) 758-5254        _/
_/    331 Newman Springs Rd.                email kaj@cc.bellcore.com   _/
_/    Red Bank, NJ 07701                  faxmail (908) 758-4196        _/
_/                                                                      _/
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To: Kaj Tesink <kaj@cc.bellcore.com>
Cc: atommib@thumper.bellcore.com
Subject: Re: createAndGo 
In-Reply-To: Your message of "Tue, 29 Nov 1994 17:12:12 EST."
Date: Tue, 29 Nov 1994 17:43:38 -0500
Sender:ietf-archive-request@IETF.CNRI.Reston.VA.US
From: Bob Sidebotham <rns@fore.com>

Kaj Tesink said:

>the "either", "or" scenario that you paint above may in practice
>not really apply since if an agent can handle the complexity of
>the negotiated approach, it can likely also handle the one-shot approach.

But there's a difference between "can handle" and "does handle
correctly".  By my reading, for instance, there's no ordering
constraint on the appearance of the row status variable for a
"createAndGo" scenario. This means that the agent is required to
handle this case correctly whether the "createAndGo" is the first item
in the PDU or the last item, or somewhere in the middle.  This can
obviously be handled using only moderately tricky multi-pass code, but
verifying that all cases are handled correctly is another matter, and
in my opinion, simply adds more layers of confusion to already
confusing SNMP semantics. The equivalent of "createAndGo" could have
been provided simply by creating a PDU which sets the row status to
"createAndWait" at the beginning and "active" at the end (and
specifying that the variables appearing in the PDU are ordered). If
the SNMPv2 folks had specified it this way, then agents that supported
both methods would have seen no difference between the two methods,
whereas an agent that required the row setup to be in one PDU could
have been allowed to require that all variables were provided.

It comes down to whether the SNMPv2 designers were trying to make it
easier for the agent or the manager. If the latter, they haven't
succeeded, since they seem to require the manager to know how to do it
both ways. I can't tell from any of the documents that I've looked
at what the intention was.

>my reading is that by specifying both methods 1695 allows agent implementors
>to choose whether to support just the one-shot or also the negotiated
>approach. you may also notice that 1695 points out a preference for
>the negotiated approach (e.g., top of p.35).

It does, indeed. What isn't clear from the specification is whether
the agent has the option of doing either. In fact, I think there's a
strong suggestion that, for certain tables, both methods are supposed
to be supported by the agent. I think RFC 1695 should state that this
is not required, if that's the intent.

Thanks for your comments.

Bob
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