This is Video #12 of our MPLS Traffic Engineering series, which is designed to help viewers gain basic understanding of MPLS Traffic Engineering and how to configure TE tunnels in Cisco routers.

In this video, we will do a lab that demonstrates how to configure Inter-AS MPLS TE tunnels.



1. Configure MPLS TE support in IGP (OSPF/ISIS) for all routers.

router ospf 1
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng area 1
router isis 100
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng level-1
 mpls traffic-eng level-2

2. On the head-end router configure tunnel with loose explicit path with the ASBRs’ loopback address as next-address.

ip explicit-path name LOOSE enable
 next-address loose
 next-address loose

3. Configure static route or autoroute destination.

interface Tunnel100
 tunnel mpls traffic-eng autoroute destination

4. Configure ASBR Forced Link Flooding on both ASBRs.

mpls traffic-eng passive-interface nbr-te-id  nbr-if-addr

5. Debug commands

debug mpls traffic-eng path verify
debug mpls traffic-eng path lookup
debug mpls traffic-eng path spf