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Static Route

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In order to actually use the TE Tunnel that has been signaled, you need to configure a way to send traffic over the TE tunnel. The static route is configured to send traffic destined to the remote PE, or the BGP VPNv4 next hop over the tunnel. 


CSR1#show mpls forwarding-table 192.0.2.13
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    
Label      Label      or Tunnel Id     Switched      interface              
56         45         192.0.2.13/32    0             Gi1        10.1.3.3 


When we look at the MPLS forwarding table we see that the outgoing label is 45 to the destination of XR13.


IOS17#traceroute 10.101.19.19 source loopback 101 num
Type escape sequence to abort.
Tracing the route to 10.101.19.19
VRF info: (vrf in name/id, vrf out name/id)
  1 100.1.17.1 14 msec 6 msec 5 msec
  2 10.1.3.3 [MPLS: Labels 45/24010 Exp 0] 50 msec 78 msec 32 msec
  3 10.3.14.14 [MPLS: Labels 24021/24010 Exp 0] 31 msec 30 msec 37 msec
  4 10.13.14.13 [MPLS: Label 24010 Exp 0] 80 msec 35 msec 43 msec
  5 100.13.19.19 41 msec *  57 msec
   

From IOS17, we trace to IOS19, which is attached to XR13, and we see that label 45 is used.

Configure the static route to forward over the tunnel.
CSR1
ip route 192.0.2.13 255.255.255.255 tunnel100


CSR1#show mpls forwarding-table 192.0.2.13 detail 
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    
Label      Label      or Tunnel Id     Switched      interface              
56         Pop Label  192.0.2.13/32    0             Tu100      point2point 
        MAC/Encaps=14/18, MRU=1500, Label Stack{28}, via Gi1
        5000000300035000000100008847 0001C000
        No output feature configured

After configuring the static route, we see that the LFIB shows the traffic towards XR13 being sent over the TE tunnel.

IOS17#traceroute 10.101.19.19 source loopback 101 num
Type escape sequence to abort.
Tracing the route to 10.101.19.19
VRF info: (vrf in name/id, vrf out name/id)
  1 100.1.17.1 15 msec 8 msec 5 msec
  2 10.1.3.3 [MPLS: Labels 28/24010 Exp 0] 47 msec 28 msec 31 msec
  3 10.3.9.9 [MPLS: Labels 24012/24010 Exp 0] 41 msec 26 msec 27 msec
  4 10.9.15.15 [MPLS: Labels 24002/24010 Exp 0] 167 msec 63 msec 27 msec
  5 10.14.15.14 [MPLS: Labels 24004/24010 Exp 0] 30 msec 27 msec 96 msec
  6 10.13.14.13 [MPLS: Label 24010 Exp 0] 42 msec 33 msec 32 msec
  7 100.13.19.19 45 msec *  46 msec

We re-trace the connection from IOS17 to IOS19 and see the longer LSP and label 28 is used.\


CSR3#show mpls forwarding-table labels 28 detail 
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    
Label      Label      or Tunnel Id     Switched      interface              
28         24012      192.0.2.1 100 [227]   \
                                       900           Gi3        10.3.9.9    
        MAC/Encaps=14/18, MRU=1500, Label Stack{24012}
        5000000900015000000300028847 05DCC000
        No output feature configured

CSR3 is upstream of CSR1 and we can see that when label 28 is received, we see that traffic is being switched, the 100 to the right of 192.0.2.1 indicates the TE Tunnel ID.
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  • Home
  • Technology VoD!
    • Cisco >
      • Route & Switch / Enterprise Infrastructure
  • Technology Breakdowns!
    • Route&Switch/Ent. Infra. >
      • L2 Technologies
      • L3 Technologies
      • VPN Technologies
      • Services >
        • IOS - Dynamic NAT
        • HSRP - IPv4 Setup
        • HSRP - Priority and Preemption
    • Service Provider >
      • IGPs (Interior Gateway Protocols)
      • First Hop Redundancy >
        • HSRP (Hot Standby Router Protocol) >
          • HSRP - IOS/IOS XE Setup
          • HSRP - IOS XR Setup
      • BGP (Border Gateway Protocol)
      • Inter AS Multicast (MSDP)
      • Intra-AS MPLS
      • Inter-AS MPLS
    • Security >
      • IOS Firewall
      • ASA Firewall
      • FirePOWER Threat Defense >
        • FTD - FTD NGFW Device Setup and FMC Integration
      • VPNs >
        • PKI
        • Site to Site VPNs
        • Remote Access VPNs >
          • IOS Remote Access
          • ASA Remote Access
    • Data Center >
      • Nexus 9000v >
        • Nexus 9000v - Enabling Features
        • Nexus 9000v - VLANs and Trunks
        • Nexus 9000v - LACP Port Channels
        • Nexus 9000v - vPC (Virtual Port Channel)
        • Nexus 9000v - OSPFv2
        • Nexus 9000v - VXLAN - Ingress Replication Flood and Learn
        • Nexus 9000v - IP Multicast
        • Nexus 9000v - VxLAN - Multicast Flood and Learn
        • Nexus 9000v - VxLAN - BGP EVPN with Multicast
        • Nexus 9000v - VxLAN - BGP EVPN w/Ingress Replication
        • Nexus 9000v - VxLAN - Inter-VxLAN Routing with BGP EVPN
        • Nexus 9000v - VXLAN - External Routing
      • Nexus 7000v
    • Palo Alto