MPLS related Notes

Senario, start adding a service provider MPLS links to interconnect branches.
- Currently using redundant OSPF ptp link for connectivity.
- Problem is intra-area ospf always prefered to bgp injected inter-area or external routes.
- Provider could could accept OSPF into PE and use ospf-Sham to present routes as intra-area.

2nd Option GRE over mpls links

interface Tunnel17220
  ip address 172.20.244.17 255.255.255.252 
  tunnel source 172.20.244.13 
  tunnel destination 172.29.200.1
  keepalive

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