Re: More error-status codes on SNMPv1?

["Abhishek Bagchi" <abhishek.bagchi at wipro.com>]

Hi,
Thanks for your valuable comments.Please find my comments inline.

Beecher Adams wrote:

> Although the error-status codes may not be extended in v1, what you could do
> is implement an error details table under your private mib.  When you issue
> one of the standard error codes, the manager could then go query the error
> details table to find out more specific information on why the error
> occurred.  The error-index field which is part of the get-response PDU could
> be used as the index into the error table.  This allows an unambigous
> correlation between the error PDU and the corresponding details in the
> table.

This seems to be a good idea.Do you mean to say that an entry in this table will
be created whenever the agent implementation populates the error index  field of
the response PDU with a varbind index?I feel the columner objects in this table
can be the v1 specific error-status and the value of the columner object can
indicate to the specific error condition .
But, the questions that come to my mind are:
1.If the index to the table entry is the error-index in the response PDU , some
other  response PDU may have the same error-index value for a different
varbind.So, there is a problem with unique indexing for the table entries. The
solution to this could be to include the request ID also in the index
information as the request ID is unique to any request PDU.

2.Assuming that the above problem is solved how does the mgmt entity querry this
table? The most obvious way seems to be a next operation as the stn doesn't know
which particular object to query in that entry.What do you feel?

3.Since every time the error-index is populated an entry is created the number
of entries can swell up at times. So we have to devise a way of periodically
deleting entries from this table.How do you think we decide upon this?

There could be a number of other questions that may come to one's mind but right
now I'm not able to think beyond these. Your valuable opinions can surely open
it up a lot more.

Thanks

>
>
> Beecher Adams
> Metro OptiX
> 2201 Avenue K
> Plano, TX 75074
> Email: beecher.adams at metro-optix.com
> Phone: 214.299.4214  Fax: 214.299.4289
>
> -----Original Message-----
> From: Abhishek Bagchi [mailto:abhishek.bagchi at wipro.com]
> Sent: Thursday, March 30, 2000 2:21 AM
> To: ietf at ietf.org
> Subject: More error-status codes on SNMPv1?
>
> Hi all,
>
>  We are working on SNMP interfaces for a product named Flash600 ( ADX,
> Layer2 switching, ATM) for FNC Inc. We are using SNMPv1 framework , but,
> unfortunately SNMPv1 supports only following error-status codes:
>
> noError(0): no error in the requested PDU.
> toobig(1): The get-response message is bigger than that the local
> implementation can handle.
> noSuchName(2): one of the requested objects does not match anything in
> the relevant MIB view that can be returned.
> badValue(3): The set-request asked the agent to write an inappropriate
> value.
> readOnly(4): A set-request tried to write a value that the operator is
> not allowed to write.Either the access specified is
> READ-ONLY or the the variable MIB definition does not permit write
> access.
> genErr(5): A variable cannot be retrieved for reasons outside the ones
> listed above.
>
> This provides very little granularity for the User to decide what went
> wrong.
>
> Is there any other way we can add more error-status codes without
> violating v1
> compliance?
> We don't want to move over to SNMPv2 ,but, still want to add more
> error-status codes?
> Can we add more error-status codes? If so, how?
>
> Thanks & regards,
> Abhishek
>
> ********************************************************************
> Abhishek Bagchi
> Wipro Technologies-Telecom Solutions
> #72,Electronics City,Bangalore-29,
> India
> Tel:91-80-8520408/0416 Ext-2108
> Fax:91-80-8520478
> ---------------------------------------
> Applying  Thought
> ********************************************************************

--
********************************************************************
Abhishek Bagchi
Wipro Technologies-Telecom Solutions
#72,Electronics City,Bangalore-29,
India
Tel:91-80-8520408/0416 Ext-2108
Fax:91-80-8520478
---------------------------------------
Applying  Thought
********************************************************************