Re: [Pce] Feed-back on Monitoring ?

Tue, 31 Oct 2006 01:42:03 -0800

Hi JP,
 
Your I-D is great.
 
I have some comments and questions.
 
1.Section 4.1
 
"C (Check) - 1 bit: when set, this indicates that the performance
   metric of interest is the PCE's availability."
 
When this "C bit" present in a PCMonRep messages, whether it indicates the PCE is available? Is it enough to indicate a PCE's availability? Some more detail info may be desirable.
 
 
2.Section 4.1
"The monitoring-id-number MUST be incremented each time a new monitoring is sent to a PCE."
 
Although 32-bit monitoring-id-number is a huge number, it will overflow one day.So, when this happen, how to deal with it? Restart another round or by other means?
 
When a PCMonReq message is sent along with a PCE chain, the monitoring-id-number is always the same or each PCE will regenerate a new one?
 
3.Section 4.3
 
What's the meaning of "Variance-processing-time"?
 
4.Section 7
"Reception of a PCMonRep message: upon receiving a PCMonRep message,
   the PCE processes the request, adds the relevant objects to the
   PCMonRep message and forwards the PCMonRep message to the upstream
   requesting PCE or PCC."
For a specific PCMonReq message, whether all the PCE along with the PCE chain will do the some collection or some of them will do some special collection?
 
 
Thanks,
 
Mach
----- Original Message -----
From: JP Vasseur
Sent: Friday, October 20, 2006 8:30 PM
Subject: [Pce] Feed-back on Monitoring ?

Hi,

See below a new ID related to the monitoring of PCE-based path computation architecture so as to required various performance metrics such as liveness verification of the various elements of a path computation chain, processing time spent on path computation at each hop (for performance monitoring or troubleshooting, ...). 

Comments and opinions are most welcome.

Thanks.

JP. 


Begin forwarded message:

Date: October 20, 2006 2:50:01 AM EDT
Subject: I-D ACTION:draft-vasseur-pce-monitoring-01.txt 

A New Internet-Draft is available from the on-line Internet-Drafts 
directories.


Title : A set of monitoring tools for Path Computation Element based Architecture
Author(s) : J. Vasseur
Filename : draft-vasseur-pce-monitoring-01.txt
Pages : 16
Date : 2006-10-19


A Path Computation Element (PCE) based architecture has been
   specified for the computation of Traffic Engineering (TE) Label
   Switched Paths (LSPs) in Multiprotocol Label Switching (MPLS) and
   Generalized MPLS (GMPLS) networks in the context of single or
   multiple domains (where a domain is referred to as a collection of
   network elements within a common sphere of address management or path
   computational responsibility such as IGP areas and Autonomous
   Systems).  In such PCE-based environment it is thus critical to
   monitor the state of the path computation chain and potentially
   gather various performance metrics with regards to the set of
   involved PCE(s) that can be used for performance monitoring and
   troubleshooting purposes.  This document specifies procedures and
   extensions to the Path Computation Element Protocol (PCEP) in order
   to gather such information.

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