MPLS Routing protocols

• Start with existing IGP’s

  • OSPF
  • IS-IS
  • BGP-4

• Enhance to carry constraint data

  • OSPF-TE
  • IS-IS –TE

Distribute topology information only

Constraint data

Link capacity,Link utilization

Resource class

Priority

Pre-emption etc

Constraint based routing is the key to Traffic Engineering

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