The MPLS WG Archive

[David Charlap <david.charlap@marconi.com>]

"Feng, Mark" wrote:
> 
> ASPEC is to collect information along the path only. The decision
> for QoS, and what you refer to in the mail, should be derived from
> the FLOWSPEC.

FLOWSPEC is provided by the egress router.  It _IS_ the QoS request.

The egress router chooses a FLOWSPEC based on anything it wants. 
Typically, the TSPEC and ADSPEC that exist in the incoming Path message
will be used to compute this.

The TSPEC represents the QoS that the ingress router wants.  The ADSPEC
represents what the network is capable of providing.  Between the two,
and maybe also some local policy decisions, the egress router has enough
information to choose a FLOWSPEC.

-- David