TE Tunnel isn't honoring rsvp constraint

[John Blakley]

All,

I'm noticing that if an existing tunnel is up and the reserved bandwidth changes, that doesn't necessarily force the TE to take another path.

For example:

Router A TE Tunnel: BW require 1024

Router B: ip rsvp bandwidth 1024

Router C: ip rsvp bandwidth 1024

Router D: ip rsvp bandwidth 1024

Router E: ip rsvp bandwidth 1024

               C

            /     \

A   --  B  ----  D  --   E

The head end calculation would be A -> B -> D --> E

I would want it to change to A -> B -> C -> D -> E.

If I change, while the tunnel is up, the incoming interface on D to 'ip rsvp bandwidth 512', the tunnel doesn't change unless I shut the tunnel down and then bring it back up. Is this not supposed to be dynamic when autoroute is enabled and path option is set to dynamic?

Thanks,

John

[John Blakley]

More info:

This is one of the routers in the path of the TE tunnel:

interface FastEthernet0/1

ip address 10.37.37.3 255.255.255.0

duplex auto

speed auto

mpls ip

mpls traffic-eng tunnels

ip rsvp bandwidth 50

end

This is the head end and path calculation:

  Status:

    Admin: up         Oper: up     Path: valid       Signalling: connected

    path option 1, type dynamic (Basis for Setup, path weight 20)

  Config Parameters:

   Bandwidth: 128      kbps (Global)  Priority: 7  7   Affinity: 0x0/0xFFFF

    Metric Type: TE (default)

    AutoRoute:  enabled   LockDown: disabled  Loadshare: 128      bw-based

    auto-bw: disabled

RSVP Signalling Info:

       Src 10.10.10.10, Dst 3.3.3.3, Tun_Id 1, Tun_Instance 85

    RSVP Path Info:

      My Address: 10.107.107.10

      Explicit Route: 10.107.107.7 10.37.37.7 10.37.37.3 3.3.3.3

      Record Route:  NONE

I don't understand how it's choosing the path if it doesn't meet the bandwidth requirements.