The MPLS WG Archive

[Curtis Villamizar <curtis@workhorse.fictitious.org>]

In message <3D1248DB.AD8336FA@marconi.com>, David Charlap writes:
> Curtis Villamizar wrote:
> > 
> > Today's routers use "r" as the value that is credited against
> > "reservable bandwidth" on an interface and ignore "p" and "b" but it
> > wouldn't hurt to set "p" to be the same as "r".
> 
> That's fine if all you're using the TSPEC/FLOWSPEC for is bookkeeping.
> 
> If your router actually performs traffic shaping/policing, then you need
> the remaining values to properly program your queues.
> 
> -- David


David,

If interoperability with major router vendors isn't important, then go
ahead and fill in and use "p" and "b" and use them.

Besides, there are technical problem.  I don't think there is a way to
signal "your 'r' value was just fine but 'b' was too big for the
buffering I have left".  Even if there was, there is just reservable
bandwidth in the flooded information so LSP path selection would
involve trial and error.

Curtis