Early Review of draft-decraene-rtgwg-backoff-algo-01
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
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"
"to enforce that all routers
triggers their SPF
Bottom of page 3
"SPF_DELAY back to INITAL_WAIT. e.g. 5 seconds."
obviously should be INITIAL_WAIT
4. Principle of SPG algorithm
"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