Early Review of draft-decraene-rtgwg-backoff-algo-01

Request Review of draft-decraene-rtgwg-backoff-algo
Requested rev. no specific revision (document currently at 01)
Type Early Review
Team Routing Area Directorate (rtgdir)
Deadline 2015-05-13
Requested 2015-04-27
Authors Bruno Decraene
Draft last updated 2015-05-13
Completed reviews Rtgdir Early review of -01 by Mike Shand
Assignment Reviewer Mike Shand 
State Completed
Review review-decraene-rtgwg-backoff-algo-01-rtgdir-early-shand-2015-05-13
Reviewed rev. 01
Review result Has Issues
Review completed: 2015-05-13


    I have been assigned as Routing Directorate QA reviewer for this

The following web page contains a briefing on
      the QA process.



The document is clear and concise and
      succinctly describes a proposed standardised SPF backoff
      algorithm.  This seems a useful step forward. The algorithm is not
      overly complex.

While suggested values for the various
      parameters are given, what is not clear to me is whether the
      intention is that these (or at least an agreed set) of these
      values are intended to be standardised as well as the algorithm.
      It would seem that different values might be suitable for
      different networks, but presumably the intention is that all the
      routers in a particular network SHOULD have the same values. Some
      discussion of this would be helpful.

I assume that "rib computation time" is the
      time that a RIB computation is to be (or was) STARTED? Obviously
      the FIB will not be updated for some time after this, in some
      cases for quite a long time after this! Does this delay need to be
      taken into account? I appreciate that in many cases it is
      difficult to ascertain reliably exactly when a FIB update has been

In reading the document I spotted the following

Intro para 3

"some back-off algorithm have"

presumably algorithms


      "to enforce that all routers

         triggers their SPF

presumably trigger

Bottom of page 3 

      "SPF_DELAY back to INITAL_WAIT. e.g. 5 seconds."

obviously should be INITIAL_WAIT

      4. Principle of SPG algorithm

3rd para

"and the while

         waiting for its stability,"

"and while waiting" would be better.

      6 Impact on micro-loops

"FIB are installed"

The FIB is installed


FIBs are installed