RE: Reflecting new-MAM/SAM definition in diff-te drafts

[Dimitry Haskin <dhaskin@axiowave.com>]

Gerald,

> 3. The 'maximum link bandwidth' parameter is a physical 
> constraint and serves to limit the assignable sum of link 
> bandwidth across class types.  In the recent discussion, this 
> constraint has sometimes been referred to as an 'implicit max 
> link BW constraint'.  However there is nothing 'implicit' 
> about this constraint/parameter, it is an existing link 
> parameter and a physical constraint on assignable link bandwidth.
> 4. Given comment #3, we don't need to use the 'max reservable 
> link bandwidth' parameter instead of the 'maximum link 
> bandwidth' parameter, as you have proposed.

The 'maximum link bandwidth' as defined is the actual link capacity and not
meant to be used as a reservation constraint. The 'max reservable link
bandwidth' was originally defined for this purpose. The amount of confusion
around these definitions puzzles me.

Dimitry

P.S. Excerpts from draft-katz-yeung-ospf-traffic-09.txt:


 2.5.6. Maximum Bandwidth

   The Maximum Bandwidth sub-TLV specifies the maximum bandwidth that
   can be used on this link in this direction (from the system
   originating the LSA to its neighbor), in IEEE floating point format.
   This is the true link capacity.  The units are bytes per second.

   The Maximum Bandwidth sub-TLV is TLV type 6, and is four octets in
   length.

 2.5.7. Maximum Reservable Bandwidth

   The Maximum Reservable Bandwidth sub-TLV specifies the maximum
   bandwidth that may be reserved on this link in this direction, in
   IEEE floating point format.  Note that this may be greater than the
   maximum bandwidth (in which case the link may be oversubscribed).
   This SHOULD be user-configurable; the default value should be the
   Maximum Bandwidth.  The units are bytes per second.

   The Maximum Reservable Bandwidth sub-TLV is TLV type 7, and is four
   octets in length.