MPLS TE, tunnel not coming up, Path Error

RoKu · ‎10-27-2018

Hi, I've been trying to solve this problem for a quite long time and I gave up. I need some help ;)

I have two devices on my desk: C6500, sup720, pfc3c, msfc3 and C7600, rsp720, pfc3cxl, msfc4. Both are connected with a wire. Both ports are switchports with allowed vlan 2326. MPLS enabled. ping works

C6500 configuration:

mpls label protocol ldp
mpls traffic-eng tunnels


interface GigabitEthernet6/2
 description to_C7600
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 3425
 switchport trunk allowed vlan 2326,3425
 switchport mode trunk
 mtu 9216
 ip arp inspection trust
 load-interval 30
 no cdp enable
 spanning-tree vlan 3425 cost 10000
 ip dhcp snooping trust

interface Vlan2326
 description to_C7600_vlan
 ip address 10.4.253.15 255.255.255.254
 ip ospf mtu-ignore
 ip ospf 65405 area 0
 mpls traffic-eng tunnels
 mpls bgp forwarding
 mpls ip
 ip rsvp bandwidth

router ospf 65405
 router-id 10.4.100.12
 network 10.4.100.12 0.0.0.0 area 0
 mpls ldp sync
 mpls traffic-eng router-id Loopback69
 mpls traffic-eng area 0
 mpls traffic-eng interface Vlan2327 area 0
 mpls traffic-eng interface Vlan2326 area 0

interface Loopback69
 ip address 10.4.100.12 255.255.255.255


#ping 10.4.8.8 source 10.4.100.12
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.4.8.8, timeout is 2 seconds:
Packet sent with a source address of 10.4.100.12
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms


#sh mpls interfaces
Interface              IP            Tunnel   BGP Static Operational
Vlan2326               Yes (ldp)     Yes      Yes No     Yes
Tunnel102              No            No       No  No     No


interface Tunnel102
 description tunnel_to_C7600_10_4_8_8
 ip unnumbered Loopback69
 tunnel source Loopback69
 tunnel mode mpls traffic-eng
 tunnel destination 10.4.8.8
 tunnel mpls traffic-eng autoroute announce
 tunnel mpls traffic-eng path-option 10 dynamic
 no routing dynamic
 ip rsvp bandwidth 8000


#sh mpls traffic-eng tunnels tunnel 102

Name: tunnel_to_C7600_10_4_8_8            (Tunnel102) Destination: 10.4.8.8
  Status:
    Admin: up         Oper: down   Path: not valid   Signalling: Down
    path option 10, type dynamic

  Config Parameters:
    Bandwidth: 0        kbps (Global)  Priority: 7  7   Affinity: 0x0/0xFFFF
    Metric Type: TE (default)
    AutoRoute announce: enabled  LockDown: disabled Loadshare: 0 [0] bw-based
    auto-bw: disabled

  Shortest Unconstrained Path Info:
    Path Weight: 1 (TE)
    Explicit Route: 10.4.253.15 10.4.253.14 10.4.8.8
  History:
    Tunnel:
      Time since created: 1 hours, 12 minutes
      Time since path change: 7 seconds
      Number of LSP IDs (Tun_Instances) used: 441
    Prior LSP: [ID: 441]
      ID: path option 10 [441]
      Removal Trigger: path error
      Last Error: RSVP:: Path Error from 10.4.253.14: Routing Problem (code 24, value 4, flags 0)

C7600 configuration:

mpls label protocol ldp
mpls traffic-eng tunnels


#sh ip vrf
  Name                             Default RD            Interfaces
  MPLS_back                        65203:1               Lo70
                                                         Vl2326
                                                         Tu102



interface GigabitEthernet1/1
 description to_C6500
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 2326
 switchport mode trunk
 mtu 9216
 no cdp enable

interface Vlan2326
 description to_C6500
 ip vrf forwarding MPLS_back
 ip address 10.4.253.14 255.255.255.254
 ip ospf mtu-ignore
 ip ospf 65203 area 0
 mpls ip
 mpls traffic-eng tunnels
 mpls traffic-eng administrative-weight 100
 mpls bgp forwarding
 ip rsvp bandwidth

router ospf 65203 vrf MPLS_back
 router-id 10.4.8.8
 network 10.4.8.8 0.0.0.0 area 0
 network 10.4.100.222 0.0.0.0 area 0
 mpls traffic-eng router-id Loopback70
 mpls traffic-eng area 0
 mpls traffic-eng interface Vlan2326 area 0
!

interface Loopback70
 ip vrf forwarding MPLS_back
 ip address 10.4.8.8 255.255.255.255


#ping vrf MPLS_back 10.4.100.12 source 10.4.8.8
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.4.100.12, timeout is 2 seconds:
Packet sent with a source address of 10.4.8.8
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms


#sh mpls interfaces vrf MPLS_back
Interface              IP            Tunnel   BGP Static Operational

VRF MPLS_back:
Tunnel100              No            No       No  No     No
Vlan2326               Yes (ldp)     Yes      Yes No     Yes
Tunnel102              No            No       No  No     No


interface Tunnel102
 description tunnel_to_C6500_10_4_100_12
 ip vrf forwarding MPLS_back
 ip unnumbered Loopback70
 tunnel mode mpls traffic-eng
 tunnel destination 10.4.100.12
 tunnel mpls traffic-eng priority 7 7
 tunnel mpls traffic-eng bandwidth 8000
 tunnel mpls traffic-eng path-option 100 dynamic


sh mpls traffic-eng tunnels tunnel 102

Name: tunnel_to_C6500_10_4_100_12         (Tunnel102) Destination: 10.4.100.12
  Status:
    Admin: up         Oper: down   Path: not valid   Signalling: Down
    path option 100, type dynamic

  Config Parameters:
    Bandwidth: 8000     kbps (Global)  Priority: 7  7   Affinity: 0x0/0xFFFF
    Metric Type: TE (default)
    AutoRoute: disabled LockDown: disabled Loadshare: 8000 [0] bw-based
    auto-bw: disabled

  Shortest Unconstrained Path Info:
    Path Weight: 100 (TE)
    Explicit Route: 10.4.253.14 10.4.253.15 10.4.100.12
  History:
    Tunnel:
      Time since created: 1 hours, 29 minutes
      Number of LSP IDs (Tun_Instances) used: 544

any ideas ?