[PWE3] RE: Alignment of TotalPerf tables in PW MIBs

["Ron Cohen" <ronc at resolutenetworks.com>]

Orly,

I agree that the Total table does not add any new information that can not be compiled from the interval table if 24 hours worth intervals are kept. However, maintaining 24 hour history is only an option (the default being 32 intervals: 8 hours). 

I do not agree that there is a difference between an T1 interface and a T1 pw. They should be treated the same way. The T1 can be a physical interface but can also be a channel carried in a T3 interface.  

The current definition of total performance in pw mibs is problematic as it states that the the counters count from the pw start time and you'll have to handle the roll-out of each counter. In addition its not clear what 'management application reset' means.

Therefore my suggestion is either:
- Remove the Total performance tables from all PW MIBs. 
- Align them with RFC3895

Ron

 

-----Original Message-----
From: Orly Nicklass [mailto:orly_n at rad.com] 
Sent: Tuesday, October 25, 2005 7:12 PM
To: Thomas D. Nadeau; Ron Cohen
Cc: Davidz at corrigent.com; pwe3 at ietf.org; Doron Tzur
Subject: RE: Alignment of TotalPerf tables in PW MIBs

 I think we should re-evaluate the semantic, cumulative sum of existing data provides no added information.
3895 maintains those for backward compatibility. 3592 does not have it, and 3276 moves towards days interval. This indicates some trend as I mentioned before.

-----Original Message-----
From: Thomas D. Nadeau [mailto:tnadeau at cisco.com]
Sent: Tuesday, October 25, 2005 16:48
To: Ron Cohen
Cc: Davidz at corrigent.com; Orly Nicklass; pwe3 at ietf.org; Doron Tzur
Subject: Re: Alignment of TotalPerf tables in PW MIBs


     This suggestion looks okay to me.

     --Tom

> Hi,
>
> I suggest to align the definition of TotalPereformance tables across 
> the various PW MIBs as well as align with already defined Total 
> performance tables in published RFCs.
>
> In particular, I suggest to align the definition in PW-MIB, TDM-MIB 
> and CEP-MIB to that of RFC-3895:
>
>  "The (place name here) Total Table contains the cumulative sum
>   of the various statistics for the 24 hour period
>   preceding the current interval."
>
> And to align the names to always include Total and structured in the 
> same way, i.e. change in TDM-MIB the name pwVcTDMPerfTable to 
> pwTDMPerfTotalTable.
>
> The different definitions for total tables in the relevant MIBs can be

> found below.
>
> Best
> Ron
>
> PW-MIB:
>
> pwPerfTotalTable  OBJECT-TYPE
>       SYNTAX        SEQUENCE OF PwPerfTotalEntry
>       MAX-ACCESS    not-accessible
>       STATUS        current
>       DESCRIPTION
>            "This table provides per-PW Performance information from
>             PW start time or management application reset."
>       ::= { pwObjects 5 }
>
> CEP-MIB:
>
> pwCepPerfTotalTable OBJECT-TYPE
>       SYNTAX        SEQUENCE OF PwCepPerfTotalEntry
>       MAX-ACCESS    not-accessible
>       STATUS        current
>       DESCRIPTION
>           "This table provides per CEP PW performance information
>            much like the pwCepPerfIntervalTable above. However,
>            these counts represent complete historical information.
>
> TDM-MIB:
>
> pwVcTDMPerfTable OBJECT-TYPE
>      SYNTAX        SEQUENCE OF PwVcTDMPerfEntry
>      MAX-ACCESS    not-accessible
>      STATUS        current
>      DESCRIPTION
>          "This table provides performance information per TDM PW
>           similar to the pwVcTDMPerfIntervalTable above. However,
>           these counters represent complete historical information. "
>      ::= { pwVcTDMObjects 7 }
>
>
> RFC-3895: Definitions of Managed Objects for the DS1, E1, DS2, and
> E2 Interface Types
>
> dsx1TotalTable OBJECT-TYPE
>      SYNTAX  SEQUENCE OF Dsx1TotalEntry
>      MAX-ACCESS  not-accessible
>      STATUS  current
>      DESCRIPTION
>             "The DS1 Total Table contains the cumulative sum
>             of the various statistics for the 24 hour period
>             preceding the current interval."
>      ::= { ds1 9 }
>
> RFC-2558: Definition of Managed Objects for the SONET/SDH interface
> type:
>
> No total table, only current and interval tables
>
>
>
> Ron Cohen
> CTO
> Resolute Networks
> Redux and Lycium Unite
>

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