To enable RSVP for MPLS TE all you need to do is specifiy the command " ip rsvp bandwidth" on the interface, you do not have to set the actual bandwidth that you want RSVP to use, as by default it will use 75% of the link bandwidth.
There are no neighbour relationships formed for RSVP.
Configure RSVP bandwidth parameters that will be used on the interface for 'signaling purposes' and resource allocation for traffic engineered sessions. Figure 9-13 outlines the configurations that need to be performed on the interface.
The "sh mpls traffic-eng tunnels" would be a more useful command to know the TE tunnels established. The " sh ip rsvp nei" shows just the neighbors with whime rsvp neighbership is formed. It could even be a non TE neighborship if just RSVP is being used for some voice applications.
The RSVP bandwidth that you configure on an interface is used for "signaling purposes"... This means that The router communicates that bandwidth to ospf/isis - TE to use in its TE topology table. Everytime a tunnel is formed reserving the bandwidth, the corrosponding bandwidth is deducted from the configured bandwidth in the topology table. So if not enough bandwidth is present during signalling of RSVP-TE tunnel, the tunnel is not established (unless it is a higher priority tunnel and pre-empts other tunnels)
I tried the scenario where I tried to establish a TE tunnel when I had NOT given "ip rsvp bandwidth " on the physical interface. I was able to set up the tunnel as long as I didnot try to reserve the bandwidth for the TE tunnel. The 0 bandwidth TE tunnel comes up. So the "ip rsvp bandwidth" enables "RSVP for IP" i.e. if you want to reserve bandwidth (which we normally do). But to anable TE on the interface you need the command "mpls traffic-eng tunnels"
6506-32-PE3#sh run int se2/3/0
Current configuration : 313 bytes
ip address 22.214.171.124 255.255.255.252
ip pim sparse-dense-mode
ip flow ingress
mpls traffic-eng tunnels
mpls traffic-eng backup-path Tunnel60004
dsu bandwidth 44210
ip rsvp signalling hello
ip rsvp signalling hello refresh interval 100
6506-32-PE3#sh run int tun60003
Current configuration : 333 bytes
ip unnumbered Loopback0
tunnel destination 126.96.36.199
tunnel mode mpls traffic-eng
tunnel mpls traffic-eng autoroute announce
tunnel mpls traffic-eng path-option 1 explicit name Eway3
tunnel mpls traffic-eng path-selection metric te
tunnel mpls traffic-eng fast-reroute
6506-32-PE3#sh mpls traffic-eng tunn brief
LSP Tunnels Process: running
Passive LSP Listener: running
RSVP Process: running
Periodic reoptimization: every 3600 seconds, next in 2351 seconds
Periodic FRR Promotion: Not Running
Periodic auto-bw collection: every 300 seconds, next in 251 seconds
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