System and method for fault-tolerance in an inter-carrier network interface

A computer-readable storage medium in a PE-ASBR (Provider Edge-Autonomous System Boundary Router), comprising computer instructions to:

• configure the PE-ASBR with a corresponding site of origin;
• receive new routing information without an attribute of origin;
• insert the site of origin of the PE-ASBR into the new routing information if the PE-ASBR is dual-homed to another MPLS-VPN cluster;
• and
• broadcast to other network elements the new routing information with the site of origin of the PE-ASBR.

In an MPLS-VPN cluster comprising a plurality of PE-Routers, route reflectors, and PE-ASBRs coupled to PE-ASBRs of another MPLS-VPN cluster, a method comprising the steps of:

• configuring each of the PE-ASBRs with a corresponding site of origin;
• and
• at one of the PE-ASBRs,
• receiving new routing information without an attribute of origin;
• inserting the site of origin of the PE-ASBR into the new routing information if the PE-ASBR is dual-homed to another MPLS-VPN cluster;
• and
• broadcasting to other network elements the new routing information with the site of origin of the PE-ASBR.

In a PE-ASBR, a method, comprising:

• configuring the PE-ASBR with a corresponding site of origin;
• receiving new routing information without an attribute of origin;
• inserting the site of origin of the PE-ASBR into the new routing information if the PE-ASBR is dual-homed to another MPLS-VPN cluster;
• and
• broadcasting to other network elements the new routing information with the site of origin of the PE-ASBR.