How to enable rsvp to start signalling on interfaces. I found in cisco documantation something like that:
ip rsvp bandwidth [interface-kbps] [single-flow-kbps]
My question concerns necessity of setting bandwidth.
As far as I know, the RSVP is started on interfaces as soon as MPLS-TE is enabled on them and in the routing protocol. You should not need to use any "ip rsvp bandwidth" command to have the MPLS-TE running. When I teach about the MPLS-TE, I teach the most simple configuration without using any "ip rsvp" commands and it works.
Make sure that your MPLS-TE support is correctly turned on exactly as Giuseppe has suggested. Also verify that individual routers are recognized in the "show mpls traffic-eng topology" output.