How to enable the RSVP protocol in TE?

ip rsvp bandwidth xxx? or something else?
how to maintain the relationship?

hi!
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
Building configuration...
Current configuration : 313 bytes
interface Serial2/3/0
ip address 17.11.78.1 255.255.255.252
ip pim sparse-dense-mode
ip flow ingress
mpls traffic-eng tunnels
mpls traffic-eng backup-path Tunnel60004
mpls ip
dsu bandwidth 44210
framing c-bit
cablelength 10
ip rsvp signalling hello
ip rsvp signalling hello refresh interval 100
end
6506-32-PE3#sh run int tun60003
Building configuration...
Current configuration : 333 bytes
interface Tunnel60003
bandwidth 9
ip unnumbered Loopback0
delay 50000
tunnel destination 19.17.18.21
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
end
6506-32-PE3#sh mpls traffic-eng tunn brief
Signalling Summary:
LSP Tunnels Process: running
Passive LSP Listener: running
RSVP Process: running
Forwarding: enabled
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
TUNNEL NAME DESTINATION UP IF DOWN IF STATE/PROT
6506-32-PE3_t60003 19.17.18.21 - Se2/3/0 up/up
Displayed 1 (of 1) heads, 0 (of 0) midpoints, 0 (of 0) tails
6506-32-PE3#
To summarize, "ip RSVP bandwidth" is not "mandatory for MPLS TE but will be used in almost all scenarios as we invariably want to reserve bandwidth with TE.
Regards,
Niranjan
(pls rate helpful posts)

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