This is Video #11 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-area MPLS TE tunnels.

References:

http://www.cisco.com/c/en/us/td/docs/ios/mpls/configuration/guide/12_2sy/mp_12_2sy_book/mp_te_interarea_tun.html

http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_areat.html

Notes/Configuration:

1. Configure MPLS TE support in IGP (OSPF) for all routers. On ABRs, configure all areas the ABR belong to. If configuration doesn’t support multiple area, it means the IOS used doesn’t support inter-area tunnels.

router ospf 1
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng area 1

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

ip explicit-path name LOOSE enable
 next-address loose 2.2.2.2
 next-address loose 3.3.3.3

3. Configure static route or autoroute destination.

interface Tunnel100
 tunnel mpls traffic-eng autoroute destination

4. Debug commands

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