The MPLS WG Archive

["Martin, Christian" <cmartin@gnilink.net>]

> I think, while propagating PATH messages RSVP-TE ensures the required
> resources will be available..thats why it queries at each 
> node if required
> resources are available or not. If not available it send back 
> the PATHERR
> with error code "admission control failure" and error value 
> "02", while
> actual resources are reserved at the time when node receives 
> RESV message.
> 
> Khuzema. 

This does nothing to control the realized QoS, as a misbehaving flow could
easily exceed its reserved QoS.  Hard QoS is a false deity in RSVP-TE over
IP networks as of today.

 -chris


> 
> 
> > ----------
> > From: 	Parmar, Pankaj N
> > Sent: 	Saturday, May 26, 2001 4:49 AM
> > To: 	'mpls@UU.NET'
> > Subject: 	RSVP-TE question
> > 
> > I need some clarification on the role of PATH and RESV 
> messages while
> > setting up an LSP with QoS requirements. The draft talks 
> about use of PATH
> > messages for verification of available bandwidth at a 
> particular priority
> > and possible pre-emption of lower priority reservations. 
> Could the PATH
> > message be used to hold QoS resources as well ? If yes, 
> then what role
> > does
> > RESV message play (in regards to setting up QoS) ? If no, 
> when do QoS
> > resources actually get reserved ?
> > 
> > Thanks,
> > 
> > -Pankaj
> > 
>