What is RSVP-TE (RSVP Traffic Engineering)?
RSVP-TE refers to a resource reservation protocol that is invented in order to allocate a bandwidth for the individual flows on the network devices.
To say it another way, RSVP-TE are extensions to the RSVP protocol specified in the RFC 3209.
Although, RSVP-TE has been initially invented as a Quality Service Mechanism in an Intserv QoS architecture, it has never been used in modern networks due to scalability problems.
This is also because allocating tremendous number of flows on the networking nodes creates scalability problems. Read more