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Re: [CCAMP] RFC 4207 LMP Erratum

Hi Alfred,

could you please explain why multiple <TRACE> objects for a single
interface are needed? I fail to understand what the application is that
requires this.


Thanks,
Dieter

ah at TR-Sys.de wrote: 
Vishwas Manral wrote:

  
Hi Adrian,

I think the BNF format below is ambiguous as it does not tell which
part is repeatetive (only trace or others too):

   <TraceMonitor Message> ::= <Common Header> <MESSAGE_ID>
                              <LOCAL_INTERFACE_ID>
                              <TRACE> ...
    

No!
See Section 2.2.5 of RFC 5511, an RFC which expressly was targetted
to codify "existing practice" (so it seems legitimate to apply it):

 2.2.5.  Repetition

   ...

   Meaning:
     May repeat the preceding object, intermediate construct, or
     construct.

   Encoding:
     Three dots ("...").

"<TRACE>" is an intermediate construct; thus it is unambiguously
the item being repeated.


  
If we want to be consistent with the other messages in the RFC it should be:

   <TraceMonitor Message> ::= <Common Header> <MESSAGE_ID>
                              <LOCAL_INTERFACE_ID>
                              <TRACE> [<TRACE> ...]

However the best representation would be:

   <TraceMonitor Message> ::= <Common Header> <MESSAGE_ID>
                              <LOCAL_INTERFACE_ID> <TRACE_LIST>

   <TRACE_LIST> ::= <TRACE> [<TRACE_LIST> | ]

Thanks,
Vishwas

On Fri, Oct 30, 2009 at 2:45 AM, Adrian Farrel <Adrian.Farrel at huawei.com> wrote:
    
Hi CCAMP,

Can I please have your help in resolving an Erratum raised against the LMP
spec RFC 4207.

You can see the full details at
http://www.rfc-editor.org/errata_search.php?rfc=4207&eid=167

The essence of the question is: how many <TRACE> objects may be present on a
<TraceMonitor Message>?

The BNF in section 4.1.1 currently implies just one. But the text could be
interpreted to man more than one.


While you are looking at this, can you say whether any other messages should
also allow more than one <TRACE> object?

Many thanks,
Adrian
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Kind regards,
  Alfred HÎnes.

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