MPLS VPNs or not?

Wed Aug 8 07:30:53 UTC 2001

Anything which routes on both source and destination addresses is a form
of circuit switching in disguise.  At least from the point of view of
routing information needed.  Thus MPLS is no different from ATM in regard
to computational complexity of algorithms involved.

(Note that there's such thing as statically-configured PVCs, of MPLS used
for manually-configured TE;  those mereley augment physical network
topology, from the point of view of dynamic routing level).

Tunnels do _not_ inject any routing information into backbone. As long as
they aren't created and destroyed "on demand" (with corresponding updates
to network's routing info) they're safe.

--vadim 

On Tue, 7 Aug 2001, Christian Kuhtz wrote:

> On Tue, Aug 07, 2001 at 06:25:50PM -0700, Vadim Antonov wrote:
> > 
> > The point is very simple - virtual circuit routing does not scale.  That
> > was beaten to death in ATM vs IP discussions years ago.
> 
> What does this have to do with VC routing?! And tunnels are probably closer to 
> VC routing than 2547(bis) style VPNs.  What is your point?
> 
> -- 
> Christian Kuhtz <ck at arch.bellsouth.net> -wk, <ck at gnu.org> -hm
> Sr. Architect, Engineering & Architecture, BellSouth.net, Atlanta, GA, U.S.
> "I speak for myself only."
> 